Subsonic Filter (CB25143E)

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

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Noise limiter (CB7397E)
This circuit for audio applications was found in an English magazine from the 80's. The circuit...
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This circuit uses a JFET at the input to increase the impedance. The circuit has a gain voltage...
Reversible sequential for LED (CB6945E)
This circuit is from an old Popular Electronics, but it can be easily implemented nowadays, even...