This circuit activates a horn from an audio signal. This can be used for remote control via audio signals. The circuit is from a Radio Electronics from October 1965.
This project was found in a 1981 documentation consisting of a simple blinker with 2 transistors. The...
This complete experimental source of low current and very high voltage can generate voltages from...
The purpose of this circuit is to automate the activation of an aquarium air pump (aerator). The...