Ambient light indicator (CB21567E)

This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The power supply does not have to be symmetrical.

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Grounding test (CB10092E)
This simple circuit for a common 110 V power grid was found in a 1980s American documentation. The circuit uses...
Pulse Extender (CB12390E)
What this circuit does is to stretch a pulse, increasing its duration. The integrated circuit is...
4017 10-Channel Manual Sequential Control (CB17280E)
This simple circuit was found in a 2001 documentation. With each touch of CH1, a 4017 output...