tapped code lock

This oscillator uses a 741 oparnp (ot; 1/4 of a LM 324) as its active component. If features an interesting and effective method to stabilise the output amplitude. A pair of reverse-parallel strapped diodes is used instead of the more conventional NTC resistor, incandescent lamp or FET. The circuit will produce I O V peak-to-peak signal with no more than 0.2% distortion.