This 4-transistor amplifier can work from 4.5 or 6 V power supplies. We found it in a Mullard transistors manual from 1960. The transistors are from the time.
Found in a 1993 Electronics Experimenter Handbook, this circuit uses a multimeter to measure...
This circuit makes use of components from the 80s. However, the configuration used can be used as a...
This circuit drives two-color LEDs at a speed that is set in the 100k pot. The circuit can be...