Very Low Frequency Clock (CB26103E)

Found in the November 1999 issue of Electronics Now magazine, this circuit generates a 6.67 Hz signal from a 4.1952 Hz crystal.

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Amplifier TDA2003 (CB17075E)
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Heads or tails CA3130 (CB22009E)
Found in an English publication from 1977, this circuit uses only 1 LED. Unlit means heads and lit...
Infrared Optical Link (CB14674E)
In the figure we have the transmitter and the receiver for an optical audio link via infrared. The...