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Author Topic: Driving a 0-10vDC signal control valve  (Read 947 times)
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dhenry
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« Reply #15 on: November 12, 2012, 10:58:33 am »
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You can create gain by inserting a resistor between the two 100k resistors and the output.
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dc42
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« Reply #16 on: November 12, 2012, 12:57:27 pm »
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See attached.
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dhenry
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« Reply #17 on: November 12, 2012, 01:00:16 pm »
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See attached.

It looks great, except that it wouldn't work.
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StuntMonkeh
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« Reply #18 on: November 12, 2012, 01:22:48 pm »
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Quote from: dhenry on November 12, 2012, 10:58:33 am
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.
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zoomkat
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« Reply #19 on: November 12, 2012, 09:37:43 pm »
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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
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« Reply #20 on: November 13, 2012, 03:16:15 am »
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Quote from: StuntMonkeh on November 12, 2012, 01:22:48 pm
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.
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