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Topic: Driving a 0-10vDC signal control valve (Read 3 times) previous topic - next topic

StuntMonkeh

I found this circuit which is a 0-10v output.


I'm pretty sure the triangle is an op-amp (LM358M) but what are the transistors doing?

dhenry

One to buffer the output and another to limit its current.

That circuit requires a 0-10v input.

Runaway Pancake


I found this circuit which is a 0-10v output. I'm pretty sure the triangle is an op-amp (LM358M) but what are the transistors doing?

You don't like the circuit that I referenced?
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StuntMonkeh


One to buffer the output and another to limit its current.

That circuit requires a 0-10v input.



So the transistor with the collector connected to the 24v is to isolate the input signal from the output and the other one is to limit the current.

Maybe I was wrong about the triangle being the op-amp.... Might be more to it than that.

I'm sure you are right about it needing a 0-10v input but can you explain.

StuntMonkeh



I found this circuit which is a 0-10v output. I'm pretty sure the triangle is an op-amp (LM358M) but what are the transistors doing?

You don't like the circuit that I referenced?


Oh no, not that... I have an old HVAC controller and found the circuit in some of the documentation so I was trying to understand what was going on.

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