Using the 723 integrated circuit, this power supply has the voltage determined by R2 and R3, which can be changed. The circuit is from a Radio Electronics magazine from July 1971.
This polarity inverter circuit for voltages down to about -12 V was found in the December 1992...
This is the common transistor version of a TTL inverter gate. The transistors are general-purpose and the...
This simple transistor tester uses a common 3 mA analog instrument that has its scale changed as...