We found this circuit in the September 1971 Radio Electronics magazine. The SCR can be any of the 106 series and the buzzer can be replaced by a relay according to the supply voltage.
The purpose of this circuit is to extend the range of applications from a Darlington pair to DC....
Found in the November 1984 issue of Radio Electronics magazine, this circuit generates frequencies that...
This circuit was obtained from an English magazine from 1976. The signal from the circuit should be...