6W Variable Tone Siren (CB25213E)

This CMOS circuit was found in the July 1990 Radio Electronics magazine. Power is for a 12V supply.

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25 W FM RF Amplifier (CB18820E)
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High impedance comparator (CB9594E)
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MW Booster (CB24181E)
This antenna amplifier circuit for medium wave radios was obtained from the April 1972 Radio...