This hybrid audio amplifier from National Semiconductor was found in the June 1994 issue of Electronics Now magazine. It is powered by 24 V.
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...