Brake light and direction indicator (CB7106E)

This circuit was found in a Popular Electronics from the 90s applying to common automotive signaling lamps. The circuit can be adapted to LEDs.

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Touch Sensor (CB18350E)
This circuit was found in a 1967 Japanese documentation. It consists of a touch control system with...
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This amplifier with complementary symmetry output and good sound quality was found in...
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The commercial MT2B receiver manufactured in Japan in the 1960s had a listening device only and...