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Topic: Driving a 0-10vDC signal control valve (Read 3847 times) previous topic - next topic

dhenry

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

dc42

See attached.
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dhenry

Quote
See attached.


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


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.
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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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