Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal applied to the input. Power supply is done according to the load.
November 2016 - The new OLED modulator for displays with 2 x 16 format can be obtained from Mouser...
This circuit indicates when current is flowing in a battery charger circuit. The circuit was found...
Found in Linear Technology documentation from the 90's, this circuit mixes two analog video...