Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next to the diagram, the formula for calculating the components.
Found in a 90s nHands On Electronics, this circuit triggers a relay that shuts off the load when...
This project was found in a 1982 publication, using only two transistors. Signal injectors are...
Designed by Philips in 1968 to control the washer water level this circuit uses components from the era....