Found in a 90's EDN, this circuit provides a current of a few tens of mA. The circuit can generate 15 V from a 5 V input.
This circuit is from Popular Electronics from October 0, 1981. The diodes can also be 1N4004 and...
This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The...
This circuit, published in 1978, can use any general purpose NPN transistor such as the BC548 and...