This circuit is from the 1990 Motorola Linear Databook, which can be developed with more modern equivalent operating systems. The 1 uF capacitor should be of good quality polyester with small leaks
This regulator can use BD'136 as the main transistor and as a reference next to a BC548 zener. The...
In the 110 V network, capacitors of 200 V or more and in the 220 V network, capacitors of 400 V or...
The circuit shown timing the drive of a motor using an optical coupler. The diode bridge can be...