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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Two FETs FM Transmitter (CB14879E)
The circuit shown is from a 1993 documentation. It uses two FETs in an oscillating configuration that...
Test Microamplifier (CB18180E)
This output step with a transistor can be used in experimental radios and intercoms or as a signal...
Field Intensity Meter (CB12832E)
This circuit, for bands above 15 MHz, was found in an Argentine publication from the 1970s. The L1...