This circuit, which is present in other points of this website, was found in a 90s Hands On Electronics. The circuit activates a buzzer with an oscillator.
This simple power supply for transistors was found in documentation from the 1940s. The...
This circuit is more sensitive than the previous one (CB4118E) for using a full wave detector. The...
The relay used in this circuit is highly sensitive and has a diode and is recommended in parallel to...