I wonder is there any way to prevent this noise
Let's say I run arduino on 9V DC buttery and my pedals are powered by 9V DC switch adaptor.Can I still connect grounds together?
I wonder is there any way to prevent this noise... Maybe micro servo and audio equipment just don't work together.
QuoteLet's say I run arduino on 9V DC buttery and my pedals are powered by 9V DC switch adaptor.Can I still connect grounds together?I once tried to make a common power supply for a collection of five peddles for my son, to replace all the batteries. The result was that two of then went up in smoke. It turns out that they have what is known as earth lift resistors in place to cope with common grounds on the signals. There was not a common power ground. In the end I had to make five small mains powered isolated supplies, one for each peddle. So beware trying to power two things off the same circuit. Test first to see that there is a common ground on the supplies.
QuoteI wonder is there any way to prevent this noise... Maybe micro servo and audio equipment just don't work together.Electric guitars/amps are Hi-Z input and it's very easy for noise to couple into it. (example: AM radio, RF buzz, fluorescent lamps, etc).... I suspect the micro servo motor (unshielded even!) butt up against the metal case of the amp is a sure fire way of transmitting the EMI/RF noise of the servo to your amp. You can try "mechanical shielding", see faraday cage, and then grounding that metal case. But the fact that it's supposed to be butted up/pressed against your guitar amp (to be able to turn the knob) I don't know if that will still be effective.
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