The integrated circuit used is uncommon today. We found this configuration in Motorola's 1990 Linear Databook. The triac can be any of the TIC series.
This 5-transistor receiver was obtained from an article in the February 1969 Radio Electronics magazine....
The oscillation of the relay causes the applied audio signal to deform and start to resemble the...
Using period transistors, this 10 W amplifier was found in Radio Electronics magazine from May...