LCD-LED Display

Puff to OFF LED Circuit

This article will show you how to create an electronic circuit that turns on and off a puff of air. We’re not strangers to candles. They’ve been utilised for birthday parties, decorating, and a specific premise for centuries. Electronics are used in almost every situation. Candles are no exception, and electronics has also aided in the development of candles that are visually appealing. We’ve shown you a basic circuit that shuts off an LED with a puff.

Outline

  • Puff to Off LED Circuit Working Principle:
  • Puff to Off LED Circuit Diagram:
    • Puff to Off LED Circuit Description:
    • Puff to Off LEDs Circuit Simulation Video:
    • Puff to Off LED Circuit Working:
    • Puff to OFF LEDs Project Output Video:
    • Puff to Off LED Circuit Applications:

Puff to Off LED Circuit Working Principle:

The circuit’s fundamental premise is to use a puff to turn off the LED. The puff delivered to the microphone is turned into a very low voltage. To turn off the led, this voltage is amplified and applied to the circuit.

Puff to Off LED Circuit Diagram:

Puff to OFF LED

Puff to Off LEDs Circuit Diagram

Circuit Components:

  • Electret condenser mic
  • Light Emitting Diode
  • BC 550 (NPN )transistor
  • BC 337 (NPN )transistor
  • BC 327 (PNP )transistor

Puff to Off LED Circuit Description:

Mic, LED, transistors, resistors, and capacitors are the key components of the suggested circuit.

The puff is detected using an electret condenser MIC. The acoustic signal is converted into an electric signal using this condenser microphone. They are extremely sensitive to loud noises. By transforming the analogue signal to an electrical signal, this works as a transducer. The electret microphone is based on electrostatic induction. The mike’s positive terminal is linked to capacitor C1, while the negative terminal is connected to ground. Through a capacitor C1, the MIC is connected to the transistor. C1 works as a high pass filter, preventing the gadget from shutting off.

The circuit uses a red LED with a 1.7v cutoff voltage. Normal LEDs emit energy in the form of heat, whereas light emitting diodes emit energy in the form of light. Light emitting diodes can withstand a voltage of up to 3 volts. LEDs may be destroyed if the applied voltage is higher than this value. The latching pair and push button are connected to the positive terminal of the led. Through a 100 ohm resistor, the negative terminal is connected to the ground.

The circuit employs both PNP and NPN transistors. The BC550 transistor is an NPN transistor. It is initially open circuit, and only when the base reaches its cutoff voltage does it begin to conduct from emitter to collector. The incoming signal from the MIC is amplified by these transistors. The latching pair receives this enhanced voltage. A PNP transistor is the BC 327. The base emitter and collector are in a conducting state when no voltage is supplied to them. When a cut-off voltage is applied to the base, the emitter and collector cease to conduct. The collector of the BC 327 transistor is linked to the base of the PNP BC 337 transistor.

These two work together as a latching pair. These two are mostly in charge of turning the LED off. The emitter of the BC337 transistor is connected to the earth by a 4.7kohm resistor, while the base is connected to the ground via a 10kohm resistor.

A signal diode in parallel to a 10uf capacitor C2 couples the output of transistor Q1 with the latching pair. The positive pulse that will reset the latching pair is shaped by the diode and C2. From capacitor C1 to the signal diode, a 1Mohm resistor is connected.

Puff to Off LEDs Circuit Simulation Video:

Puff to Off LED Circuit Working:

  • To begin, connect the components as shown in the circuit diagram.
  • As indicated, connect a 5v battery.
  • S1 (push button) is now pressed.
  • The latching pair of transistors Q2 and Q3 is activated.
  • As a result, the LED begins to shine.
  • The analogue sound signal is transformed into a voltage signal at the MIC’s output when you puff on it.
  • The transistor Q1 amplifies this voltage.
  • The latching pair receives the enhanced signal.
  • As a result, the transistor’s base receives the requisite voltage, and the PNP transistor ceases to conduct.
  • As a result, the LED stops glowing.
  • To switch it back on, press the push button once more.

Puff to OFF LEDs Project Output Video:

Puff to Off LED Circuit Applications:

  • It’s possible to use this as a candle.
  • The circuit can be used to decorate a church or for special occasions. Get a sense of how the LED Christmas Lights Circuit works.
  • This circuit is used in stained glass lights and lanterns.
  • This can be used in a variety of arts and crafts projects.
  • This circuit is used in model railroading accessories.
  • This can be used in frightening lighting and haunted dwellings.
  • This can be utilised in car novelty items.
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