Zerotohundred

Abit interesting gadget, de idea is juz to self triggle de alarm siren make it sounds like whistling. A few tiny stuff dat I uses such as Push button switch, diode, wires etc, dats it.

Step 1
Solder any side of the diode to PB switch(as shown on 1st pic) take note de direction of diode bcoz if wiring wrongly it wil not work, de purpose of diode is prevent miss direction of voltage or current(ignore de resistor coz de siren working in 12V, connect...