28 V Lock (CB7236E)

This circuit was found in a 1965 General Electric publication. The circuit can be adapted to operate with other voltage lamps.

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RIAA Stereo Preamplifier (CB11479E)
This circuit was discovered in an English publication in 1979. The circuit can still be assembled with...
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This circuit tests crystals up to a few megahertz with ease. The circuit is from a 1977...