Subsonic Filter (CB25143E)

We found this circuit in the June 1988 Radio Electronics magazine. The power supply must be symmetrical.

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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...