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How to Lengthen the Flashing Time of an LED

It may be necessary when working on an electronic circuit to vary the flashing time of a light emitting diode (LED) bulb. In such a case, potentiometers are the best tools for the job. A potentiometer is a type of variable resistor. Like standard, static resistors, it partially blocks current in an electronic circuit but it is unique because it has a rotary control that can adjust the level of resistance. Rotating the position of any potentiometer will adjust the flashing time of any LED that precedes it on the circuit.

Things You'll Need

  • Electronic device with LED
  • Screwdriver
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Instructions

    • 1

      Open the device to expose the LED circuit. LED flashing lights have many different applications including personal electronic devices, appliances and model cars and trains. In almost all cases, the device's circuit board, along with the LED, is enclosed behind a plastic or metal cover. Use a flat head screwdriver to remove the screws holding the case together. If necessary, use the tip of the flat head to gently pry the housing open. Be careful to avoid touching the tip of the metal screwdriver to other components on the circuit board, since this can cause a short circuit.

    • 2

      Locate the flashing LED's potentiometer. It is usually very close to the LED itself. While some potentiometers have an actual knob for you to turn by hand, the kind of potentiometers that control LED lights tend to be small discs about ½ inch in diameter and about ¼ inch high. At the top center of the potentiometer is a small thin slot designed to fit the head of a small precision flat head screwdriver.

    • 3

      Insert the tip of the flat head screwdriver into the slot of the potentiometer. Apply power to the device. While keeping an eye on the rate at which the LED is flashing, slowly turn the screwdriver. Rotating the potentiometer slot in one direction will slow the flash rate while turning it the other direction will increase it. When you achieve your preferred flashing rate, remove the screwdriver from the potentiometer slot.

    • 4

      Place the device housing. Ensure that the LED protrudes through its appropriate hole or window and can be seen clearly. Use your screwdriver to reinsert all screws. Apply power to the device again to check that the LED flashing speed it up to your specifications.


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