Liquid Crystal Watch (CB19860E)

This watch uses a liquid crystal display. The circuit is from the 80s and the module used is uncommon nowadays. Power is provided by a single cell.

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IR Remote Control – Receiver (CB25094E)
This is the receiver circuit for the previous remote control published in the same Radio...
Fast Peak Detector (CB14063E)
This circuit, for signals up to 1 MHz, is based on an RCA operational amplifier. The circuit was...
FSK Circuit (CB25781E)
This frequency shift modulation circuit was found in the November 1994 issue of Electronics Now...