DIY Fake LED Flashing Alarm Light

Written by marshal m. rosenthal
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It's quite common to expect to see an LED light flashing on an alarm; on a car's dashboard, for example. To build a fake LED flashing light alarm -- as a deterrent against those who might want to intrude on a seemingly unprotected vehicle -- assemble supplies from a hardware or hobby store, as well as tools that you may have on hand at home. Some experience in working with electric circuitry will be helpful as well.

Skill level:
Moderate

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Things you need

  • Circuit board, 4-by-5-inches
  • Soldering iron
  • Solder
  • 9 volt battery clip
  • Transistor, 1K
  • Silicone sealant
  • Capacitor, 330 uf
  • Needle-nose pliers
  • LED diode, 100 Ohm resistor integrated
  • 9 volt battery
  • Duct tape

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Instructions

  1. 1

    Place a circuit board on a work surface. Heat up a soldering iron for 10 minutes before continuing. Place the already-stripped end of the (=) labelled wire attached to the 9 volt battery clip through a hole on the circuit board. Turn the circuit board over.

  2. 2

    Place the transistor on the circuit board. Apply silicone sealant to both sides of the transistor. Let the sealant set for 5 minutes before continuing.

  3. 3

    Bend the "emitter" and "collector" labelled pins on the bottom of the capacitor at a 90 degree angle towards you with the needle-nose pliers. Place the capacitor on the circuit board, next to the transistor. Apply silicone sealant to both sides of the capacitor. Let the sealant set for 5 minutes before continuing.

  4. 4

    Solder the end of the battery clip wire to one of the two pins on the transistor. Let the solder cool for a minute. Solder the end of the other pin on the transistor to the "emitter" labelled pin on the capacitor. Let the solder cool for a minute.

  5. 5

    Bend the (-) labelled pin on the bottom of the LED toward you at a 90 degree angle with the needle-nose pliers. Place the LED on the circuit board, next to the capacitor, with the (+) labelled pin going through a hole. Apply silicone sealant to both sides of the LED. Let the sealant set for 5 minutes before continuing.

  6. 6

    Solder the end of the free pin on the capacitor to the end of the bent pin on the LED. Let the solder cool for a minute. Turn the circuit board on its side. Solder the free end of the wire from the 9 volt battery clip to the end of the unbent pin on the LED. Let the solder cool for a minute.

  7. 7

    Insert a 9 volt battery into the battery clip to start the LED flashing. Cover the circuit board, with the exception of the tip of the LED, with duct tape. Tape the battery clip to the underside of the circuit board.

  8. 8

    Place your fake flashing LED alarm in the car, on the dashboard or taped against the steering column to fool those viewing into thinking that you have an active car alarm.

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