This amplifier uses a 1975 integrated circuit, which is uncommon today. The circuit has a gain of 30 dB and uses a transformer-less output with 9 V power.
Found in an older Radio Electronics, this circuit generates signals that can be used with regular...
This circuit was obtained in a manual of operational amplifiers of 1973. The circuit uses...
This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an...