Many reed switches can be wired in series to perform na efficient alarm as shoen in the figure. Power supply must be 2 V highr than the coil of the relay to compensate voltage fall in the SCR. Current drain is very low when the relay is off.
Many reed switches can be wired in series to perform na efficient alarm as shoen in the figure. Power supply must be 2 V highr than the coil of the relay to compensate voltage fall in the SCR. Current drain is very low when the relay is off.
