This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974. Transistors are common types at the time.
The circuit shown below provides four adjustable reference voltages. Each of them is produced by a...
This small blocking oscillator for approximately 1000 Hz was found in an American documentation from the...
Found in 1969 documentation, this circuit supplies a load after an interval given by R1 and C1....