This circuit was found in a 90s Popular Electronics. It generates tones given by the oscillators and can be changed. The circuit already includes an amplification stage.
This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with...
This simple circuit was found in the November 1992 issue of Radio Electronics magazine. It...
We found this circuit in an old documentation. Its purpose is to turn on warning lights when the...