This 1-transistor circuit for currents up to 50 mA was found in the August 1974 Radio Electronics magazine. The transformer is 50 to 200 mA.
Any NPN general purpose transistor can be used on this simple AM radio. The coil consists of 100...
This 12 dB per octave filter was found in a 1977 digital audio publication. The circuit requires a...
This circuit was found in documentation from the 90s, using components from that time. The...