Melody Generator (CB25350E)

Based on an LS3404 this circuit was found in the July 1990 issue of Radio Electronics magazine.

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Frequency Tripler (CB4145E)
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Variable Active Filter (CB25359E)
This high-Q low-pass filter was found in the October 1990 issue of Radio Electronics magazine. The...
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This single transistor shield was found in the October 1993 issue of Electronics Now magazine. The circuit...