Subwoofer Filter (CIR25262E)

This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit is part of a home theater sound system.

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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...