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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Battery Step Up Switched Regulator (CB6065E)
This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...
Zero Crossing Detector for Magnetic Transducer (CB14157E)
The circuit presented was found in the 1994 National Instruments Linear Applications Handbook and...
Sound amplifier (CB8733E)
This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of...