This circuit was suggested by Texas Instruments in a 1980s documentation. The transistor must be equipped with a heat sink. The transformer has 10 A secondary current.
In this alarm R1 and R2 can be 10k. The SCR is any 106 Series SCR and V1 is an oscillator buzzer....
This 65 MHz oscillator uses a special transistor from the time that admits an equivalent. The circuit is...
This circuit was obtained in a publication that no longer exists in the 70s. The integrated...