741 200 mW Amplifier (CB25291E)

This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio Electronics magazine. The power supply must be dual.

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Unit gain high pass filter (CB7573E)
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Astable CA3030 (CB25140E)
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4001 Touch Bistable (CB25740E)
Found in the July 1994 Electronics Now magazine, this circuit drives a relay up to 12 V depending on...