Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a low battery indicator and a charge indicator.
The presented circuit produces the sound of a fireman's siren. In place of the output transformer with...
This circuit, which appears at other times on this site has this version obtained in a Hands On of...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...