Datasheet of This amplifier uses a pair of complementary transistors at the output and can provide 1 W of audio at a load of 3-ohm. Higher impedance speakers can be used. The circuit is from an English publication from 1986 and TR1 can be a | BC548. The supply can be done with voltages from 9 to 18 V. The trimpot adjusts the resting current, which must be in the order of 20 mA.
This modulator circuit for AM transmitters was found in a 1960 Sylvania transistor manual. Modern...
Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time,...
This TTL oscillator uses a ceramic resonator as a frequency fixing element. The resonator is found...
