Smart Charger (CB26305E)

This circuit was found in Radio Electronics magazine from the 90's. The circuit is for small NiCad batteries.

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Micro Spy (CB21872E)
Assembled with SMD components this circuit can be very small. The range is a few tens of meters. We...
Resistive Sensor Activating Reed Relay (CB12182E)
With the circuit shown, obtained in a 1980 publication, a reed-relay is activated with a resistive...
CMOS Interface (Shield) (MSB067E)
This circuit is a shield for microcontrollers and computers drivind high power loads. In the...