This 16-second voice recording circuit was featured in a telephone answering machine circuit in the March 1992 issue of Radio Electronics magazine.
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...
This circuit was found in a 1964 magazine, which no longer exists. It is a metronome, or as it was...
This simple oscillator circuit was found in a 1960 Sylvania transistor manual. The transformer is an...