slightly OT, need some electronic circuit help

Ryan Byrd ryanbyrd at
Sun Oct 7 00:32:37 MDT 2012

> 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.

this page:
has a similar "Rotary Position Closed-Loop Servo System" circuit:

except this time there are resistor values.

the op amp shown is powered by +/- 15 volt which makes me think it's a
generic 741, something like:

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