With only 1% distortion, this Motorola amplifier found in a 1968 documentation makes use of period components. The frequency response ranges from 10 Hz to 100 kHz.
Found in American documentation from the 1980s, this circuit uses transistors from that time. It...
This circuit of old documentation can be implemented with modern operational amplifiers. The...
This 80's circuit uses a small light bulb as an indicator, but an LED with the appropriate resistor...