Subsonic Filter (CB25143E)

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

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Variable mixer (CB9032E)
This dynamic mixer allows for smooth adjustment of the signal's passage from one channel to...
Power Switch (CB387R)
Using this circuit a low current switch can be used in the control of heavy duty loads, powered...
Reflected Power Adapter and Monitor CW (CB3884E)
We found this circuit in an old American documentation for hams. The circuit serves as a telegraph...