This circuit provides a 5 V negative voltage from a positive input voltage. Found in old American documentation, information on the used integrated circuit was not provided. Probably an oscillator.
Indicated for applications with a PC, this circuit was found in an English documentation from...
This circuit was published in a 90s Radio Electronics. The circuit uses the well-known LM386 that...
This dimmer, from an old publication, can use almost any triac and in shooting a neon lamp. The...