We found this circuit in the April 1992 issue of Radio Electronics magazine. The circuit uses an operating system that requires a symmetrical power supply.
This old oscillator using germanium transistors has a high impedance headphone as inductor to...
This old fashioned amplifier can source some watts to a low impedance loudspeaker. The circuit...
This 50 Hz rejector or notch filter was found in a 1975 documentation. Other frequencies can be...