This benchtop power supply with various output voltages from 1.5 to 12 V was found in Radio Electronics magazine from August 1960. The circuit uses power transistors of the time.
This audio oscillator circuit was found in a 1992 publication. In the original article it is...
This low displacement circuit was found in American documentation from the 90s. Operational...
This crystal oscillator uses a common transistor and its frequency depends on the crystal used. We...