This oscillator that generates signals below the audible range (sub audio or infrasound) was found in a 1965 documentation. Transistors are for general use.
The simple mixer presented can be used to mix the signals from low intensity sources, applying them to...
The operational amplifier used in this circuit is not very common today and the signal is...
This circuit uses incandescent lamps for the 110V or 220V grid. We found this configuration in a 1989...