Alarm with relay (CB21218E)

This latching alarm circuit using relays was found in American documentation. Sensors are connected in parallel.

Tunnel Diode Voltage Regulator (CB12876E)
This circuit from an old Argentine publication shows how it is possible to use a tunnel diode in a...
Breakout board for DC motor reversal (CB23714E)
To invert the rotation of a motor by changing the levels of an Arduino output or another...
50mA driver (CB20924E)
This ultra-low distortion driver was found in 80's Analog Devices documentation. The circuit has a...