We found this passive circuit in the February 1995 Electronics Now magazine. The circuit is passive, presenting only attenuation that must be compensated by an amplification stage.
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...