This interesting benchtop circuit was found in the May 1977 issue of Radio Electronics magazine. The circuit has frequency adjustment, and the waveform selected by a switch.
Found in a 1991 publication this circuit can be assembled with more modern components. We can use...
We found this circuit in a 1987 documentation. Its purpose is to turn on a garage light using the...
This is the circuit of a turntable from the 1970s. We found it in a repair article in the December...