We found this circuit in a 1968 Electronics World. It fires a buzzer if the ignition key is turned on and the headlight is off. The circuit uses an included oscillator buzzer like the Sonalert.
We found this circuit in an old documentation. General purpose equivalent diodes can be used. The...
This circuit, which combines a bipolar with any JFET, was found in the April 1993 issue of...
June 2017 - Microchip's new PIC18LF67K40 8-bit microcontrollers with Flash / EE / RAM memory and...