Alarm with NC sensors (CB25724E)

This alarm circuit with sensors in series was found in the Electronics Now magazine of June 1994. The circuit is powered according to the relay used.

| Clique na imagem para ampliar |

Emergency Lighting (CB17043E)
This circuit from a 1995 documentation triggers a set of lamps when the power goes out. In a more...
Remote Control Receiver (CB502)
With a coil formed by 7 turns of 26 AWG wire this circuit operates in the 27 MHz range. But you...
Simple Multimeter (CB16271E)
The assembly of a good multimeter meets only one obstacle: the precision that is obtained depends on...