This circuit is from a Radio Electronics from December 1964. The components are from the time and modern equivalents for transistors and diodes can be used.
The circuit presented is quite simple, employing tone modulation of the signal. To receive the...
Operating in the FM range, this is one of the many versions of FM transmitter that the reader can...
This sensitive photo-relay can be mounted with modern transistors such as BC558 and with the...