The circuit in the figure is an amplifier with gain 10 for alternating signals using the 741. The circuit is from an article in the Radio Electroics magazine of May 1989.
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...