This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
The circuit shown is from a 1975 Motorola thyristor manual. The triac can be of the TIC series and the...
This crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for...
This circuit was found in Radio Electronics magazine from April 1960. It was in an article that...