We found this TTL power supply circuit in the December 1972 issue of Radio Electronics magazine. The circuit uses a 1 A transformer and the 2N3055 transistor must be equipped with a good heat sink.
Found in the October 1992 Radio Electronics magazine, this oscillator is controlled by switch S1....
This circuit was obtained in a 1976 amateur radio manual. The circuit can be made with a 2N2222...
The component used in this circuit is not very common today as the circuit is from the 80's. It...