Battery Charge Indicator (CB26002E)

This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.

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Amplifier TDA2003 (CB17075E)
This is the normal configuration for the TDA2003 integrated circuit, an amplifier that can provide 10...
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...