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.
This circuit can be used with high power LEDs supplying currents from microcontrollers and digital...
The integrated circuit used in this regulator is not common today. The circuit is from a technical...
We find this circuit in an 80's EDN. The circuit can be used with equivalent operational,...