This realistic circuit has longer timings for green and red lights, with shorter timings for yellow. The circuit is from an Electronics Now from May 1994.
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...