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This post explores the workflow for migrating LTspice circuits (.asc files) into TINA, DesignSoft’s circuit simulator. We demonstrate how to import, execute, and evaluate these schematics locally on a computer. A key takeaway is the full cross-compatibility of the resulting .TSC files, which ensures a unified workflow between the TINA desktop application and the TINACloud platform.

Click here or on the image above to watch this blog presented as a video tutorial.

1. Importing and Basic Analysis (RLC Circuit Example)

The conversion process is straightforward. By using the File > Import > LTspice command, users can bring LTspice designs into the TINA schematic editor. The tutorial demonstrates this using an educational RLC circuit.

Transient Analysis

Once the schematic is imported, users can perform a Transient Analysis to examine the circuit in the time domain.

• Visualization: Waveforms are displayed in a diagram window.
• Customization: The “Collect Curves” function allows users to plot multiple signals (e.g., input and output) on the same coordinate system.
• Identification: The “Auto-Label Curves” tool helps identify voltages and currents directly on the graph.

AC Analysis

To explore frequency-domain behavior, the AC Transfer Characteristic is used. Beyond standard Bode plots, TINA provides:

• Multi-Diagram Output: Users can generate Amplitude, Phase, Nyquist, and Group Delay diagrams simultaneously.
• High-Resolution Results: By configuring start frequency and the number of plot points, users can generate detailed, high-resolution outputs across multiple tabs.

2. Symbolic Analysis

Another highlight of the tutorial is the ability to derive a circuit’s Transfer Function symbolically as an exact mathematical formula. This provides insights beyond numerical simulation, assisting in documentation and verification

Analytical Verification: The tutorial demonstrates how to extract this formula via the Equation Editor and paste it directly onto the schematic.

Curve Comparison: Users can plot the symbolic transfer function and overlay it on numerical simulation curves. A perfect alignment between the two confirms the circuit’s behavior and the accuracy of the model.

3. Active Filters and Operational Amplifiers

Using an active band-pass filter circuit based on the Analog Devices ADA4000-1 operational amplifier, the video shows how these analysis tools apply to standard building blocks.

The workflow:

1. Import the circuit file.
2. Run AC Analysis to generate the combined Amplitude and Phase Bode Plot.
3. Run Symbolic Analysis to derive the analytical transfer function.
4. Overlay the analytical curves onto the numerical plots to verify that the results align.

This also demonstrates that ideal operational amplifiers are well-suited for active filter synthesis, as the results consistently match the numerical simulations.

4. Advanced Evaluation: The LT8640 Regulator

The final section covers the simulation of a synchronous step-down regulator, specifically the Analog Devices LT8640.

Average vs. Switching Models

A critical distinction in this example is the use of simulation models:

• Average Models: These are utilized for exceptionally fast execution in the web browser and allow for AC frequency sweeps on the regulator’s control loop, which is vital for evaluating stability.
• Switching Models: These provide high-fidelity time-domain simulations, but at the cost of longer execution times.

The LT8640 model used in TINA is an equivalent SPICE model independently developed by DesignSoft, based on manufacturer datasheets. This model follows standard SPICE conventions, making it compatible with other major simulators as well.

Presentation and Customization

To make simulation data more interpretable, the tutorial highlights several layout customization options:

• Text Labels: Adding labels directly to curves for quick identification.
• Separate Curves: Using this function to isolate signals into stacked diagrams, which helps in identifying phase and gain margins when viewing frequency responses like Loop Gain.

By following these procedures, engineers can ensure that designs migrated from LTspice are fully functional, verifiable, and well-documented within the TINA and TINACloud environments.

• 📺 Watch the complete video tutorial: Watch on YouTube
• 🌐 Explore the software & features: Visit TINA Official Website

In this post, we will show you how to seamlessly convert LTspice circuits into TINACloud.

By converting these circuits into TINACloud, you can instantly run and analyze them anywhere—without any installation—on virtually any device with a modern web browser, including PCs, laptops, tablets, smartphones, Chromebooks, and many Smart TVs, regardless of whether it’s running Windows, macOS, Linux, iOS, or Android.  

It is important to note that this conversion process is also available in the offline version of TINA, allowing you to perform the transition locally.

The resulting .TSC files are fully cross-compatible, providing a seamless workflow between the offline desktop software and the online TINACloud environment. 

Click here or on the image above to watch this blog presented as a video tutorial.

Example 1: Educational RLC Circuit

TINACloud includes several ready-to-use sample circuits, which you can find under the Examples/3rd Party files/LTspice folder.

Let’s start with a simple educational RLC circuit. This is how the circuit looks in LTspice. 

1. Importing the Circuit

• Navigate to the Examples / 3rd Party files / LTSpice folder.
• Select the RLC circuit file (RLC_1.asc) and click Open.

2. Running a Transient Analysis

First, we will run a Transient Analysis. Go to the Analysis menu and select Transient… As soon as the simulation completes, the resulting time-domain waveforms are displayed cleanly on the screen.

Using the Collect Curves command from the View menu in the Diagram window, you can also plot the input and output waveforms on the same coordinate system.

You can also label the curves with their signal names using the Auto-Label Curves icon in the Diagram window.

3. Configuring AC Analysis

Next, let’s explore the frequency domain. Navigate to the Analysis menu and select AC Analysis > AC Transfer Characteristic…

In addition to standard AC Bode plots, TINACloud features advanced calculation capabilities, allowing you to easily generate Amplitude, Phase, Nyquist, and Group Delay diagrams.

Select the AC Bode, Amplitude, Phase and Nyquist diagrams, and set the start frequency to 10 kHz and the number of points to 1,000 for a high-resolution output, then click Run to execute the analysis.

Four separate tabs will appear, displaying the Amplitude, Phase, Nyquist and Amplitude & Phase (Bode) diagrams.

4. Symbolic Analysis in TINA and TINACloud

A unique feature of TINA and TINACloud is the ability to derive a circuit’s Transfer Function symbolically, presenting it as an exact mathematical formula. This allows engineers and students to gain deeper insights into circuit behavior-including poles, zeros, gain, and frequency response. This symbolic expression can also be used for analytical studies, documentation, optimization, and verification, moving beyond a sole reliance on numerical simulation results.

Note: While symbolic transfer function derivation is only possible for linear circuits, you can still analyze active filters implemented with op-amps. In TINA and TINACloud, nonlinear operational amplifier models are automatically replaced with ideal op-amp models during symbolic analysis. This provides highly accurate results, allowing the transfer function to be derived and analyzed symbolically.

Running Symbolic Analysis

To perform Symbolic Analysis, open the Analysis menu, select Symbolic Analysis, then Symbolic AC Transfer, and run the analysis.

The analytical form of the Transfer Function will immediately be displayed on your screen.

You can now insert the symbolic expression into the TINACloud Text Editor and place it directly onto the schematic, making the analytical results part of your circuit documentation. In the Symbolic Result window click on the “Send to” tab then select the “Text editor”.

Note that the formula can also be edited within the Text Editor, though we won’t cover those editing features in this tutorial.

Once the formula appears in the Text Editor, click OK. The formula is now attached to your cursor. Position it wherever you like on the schematic, and left-click to place it.

Plotting and Comparing Results

Beyond formulas, you can also plot the analytical transfer function to compare it directly with your numerical simulation results.

In the Symbolic Results window, simply click the Draw Diagram button. The plot of the Transfer Function will appear. To make comparing the analytical and numerical results easier, click on the curve and change its color to green. Next, click the curve again, then click the Copy curve icon to save it to your clipboard. Now, switch back to the previously calculated Ampl 1 tab, and use the Paste Curve icon to overlay the symbolic result directly onto the numerical curve.

As you can see, the two curves match perfectly within the line width.

Active Band-Pass Filter (ADA4000-1)

For our next example, we’ll look at a similar band-pass filter, this time built around the Analog Devices ADA4000-1 operational amplifier. This circuit is a standard building block for what we call active filters, and here is what it looks like in LTspice:

File Import and Conversion

To bring this into the TINACloud workspace, save the circuit to your local Downloads folder. Next, use the Upload command to convert the file and save it as ‘Active Bandpass Filter.tsc’.

Running AC & Symbolic Analysis

Since the setup is similar to our previous example, we’ll focus just on running the AC and Symbolic Analyses for this simulation. We’ll start with the AC Analysis, which generates our combined Amplitude and Phase Bode Plot.

Go to the Analysis menu, select AC Analysis, AC Transfer Characteristic. Click Run.

The combined Amplitude and Phase Bode Plot appears.

Next, run the Symbolic AC Transfer Analysis. Just as we explained in the last video, TINA and TINACloud automatically swap out the nonlinear ADA4000-1 for an ideal op-amp. This substitution makes symbolic analysis possible, allowing TINACloud to generate the analytical transfer characteristic.

Plot Visualization

Now, let’s compare this analytical result with our numerically calculated Bode Plot. In the Symbolic Result window click the Draw Diagram  tab. Three plots will appear: the Amplitude, the Phase and the combined Bode Plot.

Comparing and Overlaying the Curves

To easily compare the two methods, first change the color of the analytical Amplitude Plot to green, and copy the curve to your clipboard. Then, switch over to the numerically calculated Bode Plot tab, and paste the green curve directly into the Amplitude Plot.

Repeat this exact same procedure for the Phase Plot.

Final Analysis and Conclusion

When you look at the results, you can see that the numerically calculated curves align perfectly with the analytical curves. As we’ve emphasized in previous videos, this excellent agreement demonstrates exactly why ideal operational amplifiers are so widely used in active filter synthesis.

Example 3: Simulating the LT8640 Step-Down Regulator

Our final example in this video is a practical evaluation circuit based on the Analog Devices LT8640 step-down regulator.

Under its current configuration, this synchronous step-down regulator converts a 24 V input voltage into a regulated 5 V output voltage capable of delivering up to 5 A of output current.

Importing the Schematic into TINACloud

To convert and open this circuit in TINACloud, first save the circuit as an LT8640.asc file in LTspice to an easily accessible location on your computer.

Use the Upload command to upload and convert the LT8640.asc circuit file into TINACloud.  

After a brief importing process, the fully mapped schematic will automatically appear in the TINACloud circuit editor.

Important Note on the Simulation Model: The LT8640 model used in this circuit is an equivalent SPICE model independently developed by DesignSoft, based entirely on the publicly available manufacturer datasheet. Because it follows standard SPICE conventions, this versatile model operates seamlessly not only in TINA and TINACloud, but also in PSpice and other major SPICE simulators. Our independently developed model library is continuously expanding.

If you require a specific device model that is not currently included in TINA or TINACloud, please contact DesignSoft.

Running Transient Analysis (Average Model vs. Switching Model)

Now, let’s run a Transient Analysis. Instead of a slow switching model, this simulation uses an average model to ensure exceptionally fast execution times right in your web browser. This approach also provides a major advantage: it allows you to run AC frequency sweeps on the regulator’s control loop.

Select Transient from the Analysis menu and click Run. Once the simulation completes, the waveforms will appear instantly.

Customizing the Waveform Display

To make your simulation data easier to interpret and present, you can easily customize the visual layout of the waveform viewer:

• Add text labels directly to individual curves to quickly identify voltages and currents.
• Use the Separate curves function to isolate different signals and view the results in dedicated, stacked diagrams.

Running AC Analysis (Bode Plots and Loop Gain)

Because we are utilizing an average model, we can now run an AC Analysis to evaluate the stability of the power supply.

Execute the AC sweep, and TINACloud will instantly display the Bode diagram of both the power supply output and the circuit’s overall Loop Gain. To present this frequency response clearly and identify your phase and gain margins, simply add distinct labels directly onto the resulting gain and phase curves.

This concludes our blog on converting LTspice circuits into TINACloud. The same conversion procedure is supported by both TINACloud and the offline desktop version of TINA, and the resulting .TSC files can be used interchangeably in both environments.

• 📺 Watch the complete video tutorial: Watch on YouTube
• 🌐 Explore the software & features: Visit TINA Official Website

Migrating your circuit designs between different electronic design automation (EDA) tools can often be a challenge, but it doesn’t have to be. In this guide, you will learn how to seamlessly convert both offline Multisim and Multisim Live circuits to run directly in the offline version of TINA.

Whether your files are saved in the classic desktop formats (.ms13 or .ms14) or as cloud-based .msjs files from Multisim Live, TINA handles them smoothly. Furthermore, because the converted .tsc files are completely cross-compatible, you can easily jump between offline TINA and TINACloud without missing a beat.

Click here or on the image above to watch this blog presented as a video tutorial.

Let’s walk through four practical examples to see this conversion tool in action, spanning analog, digital, RF, and power management circuits.

Example 1: FM Demodulation Circuit

To demonstrate how the conversion works, we will start with an FM Slope Detector circuit. Because this design is available in both formats, we will begin by importing the Multisim Live version first.

1. Start TINA and go to the File menu.
2. Select Import > Multisim file.
3. Choose the FM Slope Detector.msjs file. The converted circuit will instantly appear right inside the TINA schematic editor.

Alternatively, you can follow the exact same steps to import the offline Multisim (.ms14) version. The same clean schematic diagram will appear.

This specific design is configured to process a frequency-modulated signal featuring a 500 kHz carrier and a 40 kHz modulating frequency.

Parameter Check and Waveform Organization

Before running a simulation, it is always a good practice to verify your signal parameters:

• Double-click the Voltage Generator, then click the Details (…) button in the Signal field.
• The FM Signal parameters will appear alongside a helpful preview of the waveform to ensure the carrier and modulating frequencies are correct.

To optimize the final output display, we can modify the PR4 output label. By changing the label to PR4:1, TINA will automatically separate the curves during analysis and position the PR4 trace at the very top of the diagram.

Transient Analysis and Verification

Navigate to the analysis menu and run a Transient Analysis. Once the results are displayed, zoom in on a few periods of the modulating signal to get a clear, detailed view of both the FM signal and the demodulated output.

To verify the results mathematically, place two cursors on the PR4 output waveform. Measuring the time difference between neighboring peaks allows you to determine the signal period. This confirms that the output frequency is indeed 40 kHz, matching the original modulating signal perfectly.

Example 2: Half Adder Digital Circuit

Our second example is a digital circuit in the Multisim Live (.msjs) format. This feature is especially valuable because Multisim Live does not currently support the conversion of digital circuits to the offline MS14 format, which limits their use in a standard desktop Multisim environment. TINA bridges this gap perfectly.

To begin, use the Import command to open your .msjs digital file in TINA.

Testing the Digital Circuit

Once the circuit appears on your screen, you can begin live testing. A standout feature of TINA is its ability to display active digital states in real-time—not just on the final outputs, but across every visible digital node on the schematic.

• Press the Dig (Interactive Digital) button to start the interactive simulation.
• Change Switch A to High; you will immediately see the state change to logic high at the Sum output.

• Set the input switches so only Switch B is High, and the Sum remains high.
• Turn both the A and B switches ON (both inputs High). The Sum drops to Low and the Carry becomes High.

This interactive test successfully confirms the standard logic operation of a Half Adder.

VHDL and Verilog Subcircuits

Digital design in modern electronics rarely relies purely on individual logic gates; instead, designers use Hardware Description Languages (HDLs) like VHDL and Verilog. These descriptions can be synthesized directly into integrated circuits like FPGAs.

TINA and TINACloud support this advanced workflow by allowing you to embed HDL macros directly into your schematics as subcircuits.

To view the underlying code of an HDL subcircuit:

1. Double-click the Half Adder VHDL macro block.
2. Click the Enter Macro button in the dialog box.
3. An HDL code window will appear, displaying the exact VHDL syntax.

You can follow the exact same steps to view the equations inside a Verilog macro.

Comparing Gate Logic vs. HDL

Close the macro windows and press the Interactive Digital button once again to test the entire system simultaneously.

Whether you toggle a single input high or turn both inputs high, you will observe that the traditional logic gates, the VHDL macro, and the Verilog macro produce identical output states. Using HDLs allows designers to work at a much higher level of abstraction, making complex digital development faster and more efficient.

For more information on creating and uploading digital circuits to Xilinx and Intel FPGA boards using VHDL, Verilog, or schematic designs, visit our YouTube channel: https://www.youtube.com/@TinaDesignSuite

Example 3: Active Bandpass Filter

For our third example, save your Multisim (.ms14 or .msjs) active filter file to your hard drive, then import it into TINA. The schematic will open automatically in the circuit editor, where you can save it locally as a standard TINA .tsc file.

Configure and Run the AC Analysis

Go to the Analysis menu and select AC Analysis > AC Transfer Characteristic… In addition to standard AC Bode plots, TINA can calculate Amplitude, Phase, Nyquist, and Group Delay diagrams. For this simulation, select the AC Bode, Amplitude, and Nyquist diagrams. Set the number of points to 1000 for high-resolution curves, and click OK. Three separate tabs will appear displaying your results.

Symbolic Analysis in TINA

A truly unique feature of TINA and TINACloud is the ability to derive a circuit’s Transfer Function symbolically, presenting it as an exact mathematical formula rather than just a plotted curve. This provides engineers and students with deeper insights into exact circuit behavior—including poles, zeros, gain, and frequency response.

Note: While symbolic transfer function derivation is only possible for linear circuits, you can still easily analyze active filters. By replacing complex, nonlinear operational amplifier models with ideal op-amps, TINA can derive highly accurate symbolic transfer functions.

To run this:

1. Go to the Analysis menu.
2. Select Symbolic Analysis > AC Transfer.
3. The analytical form of the Transfer Function will immediately display in the Equation Editor.

Documenting the Schematic

To add this formula directly to your technical documentation, click the Copy icon inside the Equation Editor window. Switch back to the TINA Schematic Editor, select Edit > Paste, and left-click to place the mathematical formula directly onto your schematic canvas.

Plotting and Comparing Results

You can also plot this analytical formula to verify it against your numerical simulation:

1. In the Equation Editor, click the Interpreter calculator icon.
2. Inside the Interpreter window, press the green arrow to run the calculation.

1. Once the transfer function plot appears, change its curve color to green and click the Copy curve icon.
2. Switch back to your original, numerically calculated Ampl 1 tab and click Paste Curve.

As you will see, the analytical and numerical curves match perfectly. This confirms that using ideal operational amplifiers in filter synthesis yields highly accurate results.

Example 4: Inverting DC-DC Converter

Our final example is a power electronics circuit: an inverting DC-DC converter based on the MC34063 switching regulator from onsemi. This circuit efficiently converts a +5 V input down to a −12 V output.

Once converted from its original Multisim format, you will find that these switching circuits run at identical or even faster simulation speeds within TINA. Simply save your .ms14 or .msjs file, select File > Import, and open it in TINA.

Running the Analysis and Customizing the Display

Navigate to the analysis menu, select Transient Analysis, and run the simulation.

To get a clean, detailed view of the switching waveforms, we can customize the diagram layout:

• Click the View tab in the diagram window and select Separate curves.
• Click on the PR1 axis to manually adjust its display limits to fit the waveform perfectly, and repeat the procedure for the PR2 axis.

Component Library Tip:

If you are building power designs from scratch, note that TINA and TINACloud include a massive library of built-in DC-DC converter ICs and evaluation circuits from leading manufacturers, including Texas Instruments, Infineon, Analog Devices, Nisshinbo Micro Devices, Würth Elektronik, STMicroelectronics, and Semtech.

Conclusion

Migrating your designs from desktop Multisim or Multisim Live to TINA is quick, seamless, and preserves the integrity of your analog, digital, and power schematics. By combining TINA’s powerful interactive modes, symbolic analysis capabilities, and fast simulation engines, you can take your circuit verification to the next level.

• 📺 Watch the complete video tutorial: Watch on YouTube
• 🌐 Explore the software & features: Visit TINA Official Website

If you are looking for a quick, reliable way to bring your existing Multisim workflows into the cloud, you are in the right place. In this post, we will demonstrate how to seamlessly convert analog circuit files originally created in offline Multisim formats (such as .ms13 and .ms14) and run them directly inside TINACloud.

💡 Good to Know: This exact conversion process is also available in the offline desktop version of TINA. Because the resulting .TSC files are fully cross-compatible, you can enjoy a frictionless workflow between your local desktop and the online cloud environment.

Click here or on the image above to watch this blog presented as a video tutorial.

Let’s dive into four practical examples to show you exactly how it works.

Example 1: AM Demodulator Circuit

Our first example features an Amplitude Modulation (AM) Demodulator circuit designed to process a modulated signal with a 500 kHz carrier and a 10 kHz modulating frequency.

Step 1: Exporting from Multisim

Before heading to the cloud, open your circuit in Multisim. Navigate to the File menu and save the circuit file to your local hard drive.

Step 2: Importing to TINACloud

Switch over to TINACloud and click the Upload command. Select your saved .ms14 file to initiate the automatic conversion. In just a few moments, your fully converted schematic will populate the TINACloud editor workspace.

Step 3: Verifying Signal Parameters

To double-check that your inputs carried over correctly, double-click the AM signal generator component. Click the “…” (Details) button on the right side of the Signal line to view and verify the specific parameters of your modulated waveform.

Step 4: Running the Simulation

With everything verified, go to the analysis menu and select Transient Analysis. Once the simulation finishes running, you will see the resulting waveforms on your screen, confirming that the circuit behaves identically to its original Multisim environment.

Example 2: FM Demodulation Circuit

Next up is a Frequency Modulation (FM) Demodulation circuit, configured to handle a 500 kHz carrier signal with a 40 kHz modulating frequency.

The Conversion Process

Just like before, save your Multisim file locally (your Downloads folder is a quick, accessible choice). In TINACloud, click Upload, select your file, and watch the platform instantly generate the web-ready schematic.

Waveform Organization & Customization

First, inspect your signal generator parameters to ensure the frequencies are accurate.

To double-check that your inputs carried over correctly, double-click the FM signal generator component. Click the “…” (Details) button on the right side of the Signal line to view and verify the specific parameters of your modulated waveform.

To make the final graph easier to interpret, we can manipulate how the traces display. Open the properties for the output probe PR4 and add :1 to the label name (changing it to PR4:1). This tiny syntax trick tells TINACloud to isolate this specific trace and move it directly to the top position of your diagram.

Running the Analysis

Execute a Transient Analysis. When the graph appears, use the zoom tool to focus on a few periods of the modulating signal. This gives you a clear, uncrowded view of both the raw FM signal and the demodulated output.

Verifying with Cursor Measurements

To verify your output frequency mathematically, place two cursors on the PR4 output waveform. Measuring the time difference between neighbouring peaks allows us to determine the signal period and confirms that the output frequency is indeed 40 kHz, matching the original modulating signal.  

Example 3: Active Bandpass Filter

For our third example, we are converting an Active Bandpass Filter. After uploading your .ms14 file to TINACloud, you have options for how you want to manage your files:

• Use the Download command to save the newly converted file locally in TINA’s native .TSC format.
• Use Save or Save As to store it securely in your cloud-based TINACloud folders.

Advanced AC Analysis Configuration

Go to the menu bar and select Analysis > AC Analysis > AC Transfer Characteristic…

Beyond basic Bode plots, TINACloud is highly capable; it can calculate Amplitude, Phase, Nyquist, and Group Delay diagrams simultaneously. Check the boxes for AC Bode, Amplitude, and Nyquist, and set the number of simulation points to 1000 for a smooth, high-resolution curve. Click Run.

TINACloud will open three separate tabs, neatly separating your Amplitude, Nyquist, and combined Bode diagrams.

Deep Dive: Symbolic Analysis in TINA

One of the most powerful features unique to TINA and TINACloud is the ability to derive a circuit’s Transfer Function symbolically. Instead of just plotting lines based on raw numbers, the engine calculates the exact mathematical formula of the circuit.

This is incredibly valuable for engineers and students looking to study poles, zeros, gain, and absolute frequency responses without relying strictly on numerical guesswork.

⚠️ Note: Symbolic derivation is mathematically reserved for linear circuits. However, you can still easily analyze active filters. By temporarily replacing complex, non-linear operational amplifier models with ideal op-amps, you will achieve highly accurate symbolic formulas.

1. Generating the Formula

Navigate to Analysis > Symbolic Analysis > Symbolic AC Transfer, and click run. The algebraic, analytical form of the Transfer Function will pop up instantly in a new window.

2. Documenting the Schematic

You can stitch this exact formula right onto your schematic diagram for professional documentation. Inside the Symbolic Result window, click the Send to tab and choose Text editor.

(Note: You can tweak or format the equation inside the Text Editor text box if needed). Click OK, and the formula will attach directly to your mouse cursor. Move it to an empty spot on your grid and left-click to drop it in place.

3. Comparing Symbolic vs. Numerical Data

To prove how accurate the symbolic equation is compared to the heavy numerical simulation run earlier:

1. In the Symbolic Results window, click Draw Diagram to plot the algebraic formula.
2. Click the resulting curve and change its color to green to differentiate it.
3. Click the curve again, and select the Copy curve icon to save it to your clipboard.
4. Switch back to your original, numerically simulated Ampl 1 tab, and click Paste Curve.

As you will see, the symbolic green line overlays the numerical red line almost perfectly—which is exactly why ideal op-amp approximations are so trusted in filter synthesis.

Example 4: Inverting DC-DC Converter

Our final example is a power electronics circuit: a DC-DC converter built around the popular MC34063 switching regulator from onsemi.

This circuit steps up and inverts a +5V input into a stable -12 output. It is available in both Multisim Live (MSJS) and Multisim Offline (MS14) configurations. Both variants convert seamlessly into TINA, where they run at identical—and often vastly superior—simulation speeds.

Upload and Setup

Save your file, click Upload from TINACloud’s File menu, and open the circuit inside the editor.

Customizing the Waveform Display

Go to Analysis > Transient Analysis and run the simulation.

When the graph window appears, the waveforms might overlap. To fix this, click the View tab in the diagram menu and select Separate curves. Next, select the PR1 axis line, input your preferred scale values, and repeat the process for PR2. This cleans up the display, creating a presentation-ready look at your input vs. inverted output waveforms.

Wrap-Up & Industry Integration

Whether you are designing basic filters or complex switching power supplies, TINA and TINACloud feature a massive built-in library of specialized DC-DC converter ICs and official evaluation circuits from the world’s leading manufacturers, including:

• Texas Instruments
• Infineon
• Analog Devices
• Nisshinbo Micro Devices
• Würth Elektronik
• STMicroelectronics
• Semtech

Ready to see these step-by-step conversions in action? Check out our full multimedia resources below:

• 📺 Watch the complete video tutorial: Watch on YouTube
• 🌐 Explore the software & features: Visit TINA Official Website
• 🎥 Subscribe for more design insights:
  www.youtube.com/@TinaDesignSuite

In this post, we’ll walk through how to convert digital circuit files originally created in offline Multisim formats such as MS13 and MS14, and run them directly inside TINACloud. The same conversion process is available in the offline version of TINA, where you can perform it locally as well.

We’ll cover three examples, each illustrating a different type of circuit: a purely digital up/down counter, a mixed-mode digital dice, and an 8-bit PIC microcontroller running both assembly and C code.

Click here or on the image above to watch this blog presented as a video tutorial.

Example 1: 8-bit Counter

Our first example is an 8-bit counter — specifically, a two-digit synchronous up/down counter built from two 74191N counter ICs and two 7-segment HEX displays. Interactive switches let you:

• Enable or disable the counting process.
• Clear the counters completely.
• Control the direction of the count (upward or downward).

With the Counter.ms14 file already saved locally, we use the Upload command to bring it into TINACloud, where it’s converted automatically.

To run the simulation, press the TR button and enable counting with the Upwards switch. The counter starts from zero and climbs steadily. Once the U2 display reaches F, U1 advances to 1 and U2 rolls back to 0. Disabling counting with the Upwards switch, clearing the counters, flipping the direction, and re-enabling counting causes the counter to count downward starting from FF.

Replacing the switches for a fully digital version

If you replace the standard switches with TINACloud’s Digital High-Low switches, the circuit becomes fully digital, letting you observe the digital states of every node. Press the Dig button to enter this view.

Example 2: A Mixed-Mode Digital Dice

Our second example is a mixed-mode circuit — a digital dice. The design pairs an NE555 analog oscillator, which provides the clock pulses, with a CD4017 digital decade counter.

With the MS14 circuit file already on hand, we upload it into TINACloud using the standard procedure. The CD4017 is designed to convert incoming clock pulses into a sequential HIGH signal across its ten decoded outputs, Q0 through Q9. In this circuit, however, output Q6 is wired back to the Master Reset (MR) pin: the moment the counter reaches 6, it resets to zero instantly. The result is a circuit that effectively cycles through positions 1 to 6.

To see it in action, start the simulation by pressing the TR button, then click S1 to close the switch. The TINACloud logic indicators now light up one by one, moving from left to right. Clicking the switch again opens it, interrupting the clock pulses; the counting stops immediately, leaving one indicator HIGH at a random position between 1 and 6. This is why this circuit can be considered a digital dice. Opening and closing the switch repeatedly causes the sequence to “freeze” at a different indicator almost every time, neatly demonstrating the interaction between the continuous analog oscillator and the digital counter.

Example 3: 8-bit PIC Microcontroller

Our final example features an 8-bit PIC microcontroller (MCU). While microcontrollers are supported only in the offline version of Multisim, they are fully operational in both the offline and cloud versions of TINA.

The circuit, an “LED Blinker,” periodically toggles an LED on and off. Moving it from Multisim to TINACloud requires both the circuit file and the microcontroller program file. When you save the PICLedBlink.ms14 file in Multisim, the .ASM assembly file isn’t exported automatically — you have to extract it manually:

1. Double-click the MCU symbol in Multisim.
2. Open the Code tab and click Properties to launch the MCU Code Manager.
3. Click the icon on the right side of the “Show machine code file…” line.
4. In the file list, right-click PicLedBlink.asm and open it in Notepad.
5. Save it as PICLedBlink.asm in the same folder as your .ms14 file.
6. Compress both files into a single archive named PICLedBlink.zip.

Upload the ZIP file to TINACloud as usual, and the schematic diagram of the same circuit appears. In the MCU symbol in TINA and TINACloud, the MCU program file is directly available.

To view the MCU program file — in this example, the .asm file — double-click the MCU symbol, click the “…” icon on the right side of the MCU Code line, and choose Preview. The assembly language code appears. You can also upload your own assembly code by selecting Upload. Pressing the TR button starts the simulation, and the LED begins to blink immediately.

Debugging code execution with the MCU Debugger

TINACloud also lets you study code execution using the built-in MCU Debugger. Enable MCU Code Debugger in the Analysis menu, then press the TR button again to launch the debugger window. From here, you can:

• Use the Step button to execute code line-by-line while monitoring Registers and Memory.
• Set Breakpoints by clicking on a line of code or using the Breakpoint button.
• Press Run, and the program will halt at your designated points.

Pay close attention to Port B, which directly controls the LED.

C-Code and Arduino

While assembly is the most powerful tool, you can also program MCUs in TINACloud using C, which is much easier to write and read. Open PICLedBlink_C_Code.tsc — the circuit looks identical to the previous one, but the PIC is now running on C-code. Press the TR button to start the simulation, then double-click the MCU and click the “…” at the end of the MCU-code line, selecting Preview to view the source. As you can see, C-code is generally much easier to read and follow, and you can debug it in much the same way as assembly.

These days, the Arduino platform is more often used in place of programming MCUs directly in assembly or even in C, thanks to its ease of use. The Arduino platform is also supported in both TINACloud and TINA. For more information, see our Arduino tutorials on our YouTube channel, for example “Arduino blinking LED simulation using TINACloud.”

Learn More

For more information, visit www.tina.com or our YouTube channel at www.youtube.com/@TinaDesignSuite.