This circuit was found in a 90s Popular Electronics. It produces a muted tone similar to that produced by a bell. The signal must be applied to an amplifier.
This circuit can be used in a power grid remote control project with the coil according to the...
We found these circuits in a 90s Radio Electronics. In them, we have the way to turn a load on and...
The diagram shows a tone control with the LM381 IC. The circuit is from a Radio Electronics from...