Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Help understanding 4-20mA current loop temperature sensor

Status
Not open for further replies.
The op amp is configured in a Howland circuit to generate a constant current independent of loop resistances and the supply voltage in the loop (within it's operating limits), with the current value proportional to the temperature of temp sensor U1.

The diodes put the circuit inside a diode bridge so that it works for either supply polarity.
 
It's an emitter follower to boost the output current of the op amp (which likely can't deliver 20mA).
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top