I have some old vellman kits for generating steam engine sounds. They use 100k pots to change the sound speed.
Is it possible to obtain 100k digital pots to use here. I can use the arduino, as in the description of the DS3502 pots, and drive the throttle channel from the rc receiver into the arduino. That side I have done with some success in motor mixing in boats.
Is there a better way to do this?
The 100kohm pot, as a manually variable resistor, is on the negative input of a LM324 op amp.
Best regards CC
Sounds viable to me 
An alternative might be a DAC + Op-Amp, but whether that’d be any better or not depends on the rest of your setup
I tossed the scenario to chatgpt and it concurred but also had some good additional advice (and a funny one!), compare its suggestions with your needs and voila!
Hi
Thanks for the response. I attach the schematic of the sound generator. The pot in question is RV1. (Operating as a variable resistor) My problem might seem to be that the circuit runs at 9v, and I am not sure if many 100k digital variable resistors are suitable for the resistance side at that voltage? TheDs3502 is, but only 10k!
Yes the suggested option of a servo driven pot has been considered, but its not too “techy”!!
Can I repeat this to the chatgpt, or would I have to setup an account? Most of the suggested are only 5V limited?
Many thanks ChrisC
