This part is just to dial in the voltage, correct? Will this be replaced with a unique resistor once the value is determined?.....Colin

• http://www.surplussales.com/Potentiometers/Pots-15.html

Mike Percey sells a high performance bulk-foil version. I have not tried this yet, but would buy a few when next ordering from him.

For this sort of small signal work, I prefer to stay away from parts with that much stray inductance( wire-wound=inductive coil ). Stray capacitance is also higher with such designs( I suspect, no absolute confirmation, but it does generally follow ).

Stray stuff is begging to contribute to an oscillator circuit. We are trying to avoid creating an oscillator, remember?
regards,
Douglas

500R 1W.

PN 594-70Y501

It's a bit on the 'spensive side, and a 0.5 Watt will do, even a 0.25 will be fine.

right below it are the 20 turn model 434P at ~1/3 the price.
regards,
Douglas