What you'll need: - a wireless doorbell - 1 x transistor (like bc547) - 1 x relay - 1 x 1K resistor Tools: - some solder - a soldering iron - .... How it works Normal: When you push the button = the remote sends a signal = the doorbell receives the signal and makes...By: geo bruce
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Source: http://www.instructables.com/id/Remote-control-school-bell/
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