This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The transistor must be mounted on a heatsink and the transformer is a 1,5A secondary winding.
This circuit was originally recommended to give the call signal on intercoms. However, it can be...
This circuit accurately monitors a 5 V TTL source. The circuit is from National Semiconductor's Linear...
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...