Okay, this time we will make a Sign Light Alarm. I use back alarm as the main ingredient. i use a relay as a switch. elco function to hold the relay to keep it ON. The diode function is to make the "+" Sign L and R not connect so that the Sign Light works normally. If you often forget to turn off the Sign / Sein light, turn is the solution.
The main ingredient :
1. Alarm Back (back alarm)
2. 12v relay
4. 3A diode
5. Sufficient cable.

Black wire (Negative) Connect with (-) Elco.

I hope the video "Alarm Lamp Sign" inspires you.
#Back Alarm # Sign #