Hartley for 1 MHz (CB25588E)

This oscillator was found in the July 1993 Electronics Now magazine. The coil is wound with 28-wire in a 0.5 cm shape.

Reflex receiver with speaker (CB20567E)
Found in a 1963 documentation, this circuit employs germanium transistors of the time. Transformer and...
Tuned Ultrasonic Receiver (CB24920E)
In the figure we have a way of receiving ultrasonic signals of a single frequency using a PLL 567....
Phase Shift Oscillator (CB14952E)
This traditional circuit generates a 200 Hz sinusoidal signal. The frequency depends on the...