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.
This 80's National Semiconductor circuit uses an era integrated circuit and symmetrical 5V power...
This CMOS circuit is re-triggerable. It was found in the April 1988 issue of Radio Electronics...
The frequency of this circuit depends on the crystal. The transistor supports a modern equivalent. We...