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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DC Motor Control (CB12292E)
This circuit is from 1977 documentation, but can be assembled with BC548 for Q1, Q2 and Q4, BC558...
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Found in American documentation from the 90s, this circuit uses components that are still common...
Piezoelectric Mike Preamplifier (CB786E)
This high impedance input amplifier is suitable for the use with piezoelectric sources such as...