This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
This circuit was found in the March 1992 issue of Radio Electronics magazine. The circuit has...
This circuit was found in Motorola documentation from 1969. The transistors are from that time. The...
This circuit was found in a 1991 publication. The transistor can be a general-purpose type....