Using the 723 integrated circuit, this circuit was found in an article on power supplies in the August 1971 Radio Electronics magazine. The transistor may be the BD136 on a heatsink.
The presented circuit uses an operational amplifier that is uncommon nowadays, but it can be...
This circuit is powered by only 3 V and can flash white LEDs from 3.2 to 3.6 V, as it includes a voltage...
This circuit is suggested by National Semiconductor and is based on an LM1578-A integrated circuit...