Voltage-Controlled Current Source Circuit

This circuit is a Howland voltage-controlled current source. It is scaled to provide a 20mA output current with a +1V input voltage. This type of current source can be very useful in industrial applications. A R-R output op amp with an input common-mode range that includes its negative supply rail, such as an OPA251, is required for single- supply operation. For V+ supply over 12V, use Zetex ZXTN2010G (60V, 3W, SOT223, HFE = 100 min). Re- scaling this circuit with other transistors can result in output current capability of a many amps. (Circuit is created by Neil P. Albaugh,  TI – Tucson)

Voltage-Controlled Current Source Circuit:

Voltage-controlled current source circuit-blog

Online Simulation of the “Voltage-Controlled Current Source” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai