This alarm oscillator was found in the December 1974 issue of Radio Electronics magazine. The power transistor must be equipped with a good heat sink. The Frequency basically is given by C1.
We found this time base of 0.1 to 90 seconds in a circuit manual from the 90s. The single-use...
The L79xx is the SGS version of the 79xx. The circuit was obtained in the SGS manual of linear...
Found in na 1980’s English magazine, this circuit produces a strong modulated tone reproduced on a...