This dual-tuned 60 Hz oscillator was found in the Radio Experimenter Special projects of 1993. The circuit has the timing ranges given by C1 which can be changed.
This circuit with integrated TTL 7400 has a good teaching purpose, drawing one of two LEDs. The...
The preamplifier using JFET presets a high input impedance and very low distortion. The input...
The figure shows how to generate a sinusoidal signal using 4 flip-flops. The circuit is from a...