Using the integrated circuit 723 we found this power supply in an article in the magazine Radio Electronics from August 1971. The transistor may be a BD136 equipped with a heat sink.
August 2017 - Texas Instruments' new integrated circuit BQ25872, a 7-A keyed battery charger with...
This crystal oscillator uses a common transistor and its frequency depends on the crystal used. We...
Found in the April 1995 issue of Electronics Now, this circuit operates at a lower frequency than...