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.
Found in an American documentation from the 90s, this circuit works as a receiver for a data...
This experimental amplifier was found in the 1960 Mullard transistor reference manual. The...
This circuit makes use of an uncommon TTL component today, but it can be implemented with...