800 Hz Tone Generator (CB25518E)

This 555 circuit was found in the October 1992 issue of Radio Electronics magazine. A power stage is used for increased volume.

End of Time Warning Timer (CB4673E)
We find this circuit in a 1995 documentation. It warns when the timing is nearing its end, with...
Telephone Dialer (CB5979E)
This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference,...
Audio Limiter (CB948E)
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...