Found in an Electronics World of 1968 this circuit can use any SCR and diodes depending on the load. The circuit is full wave and the unijunction can be 2N2646.
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...
Found in a 1988 publication, this 455 kHz crystal oscillator circuit is used to calibrate AM...
This circuit was found in the January 1991 issue of Radio Electronics magazine. The circuit uses...