Published on June 21, 2017
This is a simple Batteryless Door Alarm Bell.
DC 3V motor : From CD ROM
DC 110V Motor : From Massage machine
Limit Switch : From Laser Printer Circuit board
This is a simple Batteryless Door Alarm Bell.
DC 3V motor : From CD ROM
DC 110V Motor : From Massage machine
Limit Switch : From Laser Printer Circuit board