This circuit filters low frequency noise from the turntable motor. We found it in a 1989 documentation. The font doesn't have to be symmetrical, but it should have excellent filtering.
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...