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.
If mounted with SMD components, this transmitter will be so small that it can be installed inside a...
The output voltage of this circuit is the sum of the input voltages. The circuit is from the 1994...
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...