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

dhenry

You can create gain by inserting a resistor between the two 100k resistors and the output.

dc42

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

dhenry

Quote
See attached.


It looks great, except that it wouldn't work.

StuntMonkeh


You can create gain by inserting a resistor between the two 100k resistors and the output.


So if I put a 100k resistor in where you said that would give me a gain of 2.

What does the 100k resistor thats currently located between the output and ground?

I know the circuit I found does not allow for any conditioning of the PWM.  I assume I will need some sort of low pass filter on the op-amp input.

zoomkat

Well, you could go to radio shack and get a rectifier to rectify the 24vac into a dc current, use some fat capacitors to smooth the DC ripple, and use a voltage regulating chip (7805, 7812, etc and some small diodes) or a pot to get the output voltage down to ~10v for the base signal. Crude, but might work.
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

dc42


I know the circuit I found does not allow for any conditioning of the PWM.  I assume I will need some sort of low pass filter on the op-amp input.


The schematic I posted includes the low pass filter.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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