Touch Switch (CB6449E)

This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.

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Sequential Earthworm (CB18227E)
The name of this effect obtained in a 1985 documentation is due to the way the lamps light up in...
Bargraph Battery Tester (CB26313E)
Found in an issue of Elektor magazine in the 90s, this battery tester is based on the LM3914. The...
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