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.
In high voltage sources, it is recommended to quickly discharge the filter capacitors to avoid...
This second amplifier is based on the integrated LM108 and has a differential input. The resistor...
This integrating circuit multiplies the time that can be obtained with a 555 timer. We find it in...