This Schmitt trigger that converts rectangular signals to square signals was found in the January 1994 issue of Electronics Now magazine. The circuit uses common general-purpose transistors.
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...