slightly OT, need some electronic circuit help
torriem at gmail.com
Sat Oct 6 21:44:09 MDT 2012
I know many of you guys are electronics geniuses as well as linux gurus.
I need a very simple circuit and despite searching the internet I
haven't found any real good recipes, except one rough schematic that I
will present here.
Basically I have a simple linear actuator (12 V) with a built-in
potentiometer for position feedback. My needs are pretty simple. I
just need to be able to control the actuator to attain 3 positions:
extended, middle, and retracted. I only need rough resolution, so I
don't need a full PID circuit, I don't need the actuator to worry about
overshooting and homing in like a normal servo does. I don't need PWM
to drive the motor. I just need the thing to move and stop.
Here is a link to a simple circuit that does exactly what I need (a
switch and resisters can replace the POT):
However it does not specify what sort of op amps to use. I am unsure
how to translate the schematic into a working circuit with real parts.
Also I don't know how to choose the resistor values.
Can anyone give me advice here?
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