Suggested by a 1968 Motorola power semiconductor manual, this circuit uses a special transformer and transistors from the era. The frequency is 60 Hz.
This circuit allows the use of headphones and microphones with diverse characteristics in audio...
This amplifier with an OTA has a gain of 40 dB. The power supply must be symmetrical. Found in...
Found in a Linear Technology 80s integrated circuit manual this circuit has its gain controlled from...