Beam Communicator (CB25533E)

This circuit was found in the December 1992 Radio Electronics magazine. Range depends on optical capabilities and also weather conditions.

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Undervoltage and overvoltage indicator (CB5073E)
This circuit that uses only transistors indicates when the voltage in the circuit has the voltage...
Robot Bug (CB25466E)
This is the circuit of a robot published in the June 1992 issue of Radio Electronics magazine. The sensors...
Tone Decoder (CB5146E)
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...