Simple NiCad Charger (CB26201E)

This battery charger was found in the Electronics Experimenter Special Projects of 1983. The circuit uses an SCR as the control element.

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1 kHz Sinusoidal Generator LM3900 (CB14192E)
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...
Electronic Variac (CB20294E)
This variac was found in an old documentation, but it has a current circuit, just using triac of...
Instrumentation Amplifier (CB4938E)
This circuit is from an old 80's linear circuit manual. The configuration can be implemented with modern...