This Power supply sources from 500 to 1,000 mA according the transformar and was found in a publication of the year 1958. The diodes can be now the 1N4004 and the transistor should be mounted on a heatsink.
Twin-T oscillator are designed to produce sine low frequency signals. These oscillator are...
This circuit keeps an LED on briefly when S1 is pressed. The time depends on C1. The circuit is...
This stage was used in old audio ampliiers and radios from the 1950s and 1960s. It uses one of the...