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Puff To OFF LED Circuit

This text explains you how to make a puff remote switch for lights to off led electronic circuit. Candles are not new to us. They’re getting used since ages for the birthday parties, decoration or a certain premise. Electronics is used everywhere. Candles are no exceptions and electronics has also helped to plot candles which look. Here we’ve presented a simple circuit that turns off the LED just by a puff.
Puff to Off LED Circuit Working Principle:

The principle principle of the circuit is to show off the LED by a puff. The puff applied to the mic is converted right into a voltage whose value is very small. This voltage is amplified and applied to the circuit with a purpose to make the led turn off.
Also Read the Post: How LED Flasher Circuit Works

Puff to Off LED Circuit Diagram:
Puff to Off LEDs Circuit Diagram

Wireless Black 2 Gang 1 Way Touch Switch Touch Panel Switch 86Circuit Components:
Electret condenser mic
Light Emitting Diode
BC 550 (NPN )transistor
BC 337 (NPN )transistor
BC remote switch for lights 327 (PNP )transistor

Puff to Off LED Circuit Description:
The proposed circuit mainly consists of mic, LED, transistors, resistors, capacitors.
An electret condenser MIC is used to sense the puff. This condenser mike is used to convert the acoustic signal into electric signal. They have high sensitivity to loud sounds. This acts like a transducer by converting the analog signal to the electrical signal. The electret microphone is a electrostatic induction based microphone. Positive terminal of the mike is connected to the capacitor C1 and the negative terminal is connected to the bottom. The MIC is connected to the transistor through a capacitor C1.This capacitor C1 acts as a high pass filter and prevents the device from shut-off.
A red LED is used within the circuit has cut off voltage of 1.7v.The sunshine emitting diode emits the energy within the form of light while the traditional LEDs emit energy within the type of heat. Light emitting diodes can resist as much as a worth of 3v.If the applied voltage is greater than this voltage LEDs may get damaged. The led positive terminal is connected to the latching pair and push button. Negative terminal is connected to the bottom through a resistor of 100 ohm resistance
Both PNP and NPN transistors are used in the circuit. BC550 is an NPN transistor. Initially it’s open circuit and it starts conducting from emitter to collector only when the bottom has its cutoff voltage. These transistors are used for amplifying the incoming signal from the MIC. This amplified voltage is applied to the latching pair. BC 327 is a PNP transistor. When there isn’t any voltage applied to the bottom emitter and collector is in conducting state. When the bottom is supplied with cut-off voltage emitter and collector stops conducting. The collector of the BC 327 is connected to the bottom of the BC 337 transistor which is a PNP transistor. These two acts as latching pair. These two are mainly liable for turning off the LED. A 4.7kohm resistor is connected to the bottom from the emitter of BC337 transistor and 10kohm from the base to the bottom.
The output from transistor Q1 is coupled with the latching pair through a signal diode in parallel to a capacitor C2 of 10uf. Diode together with C2 shapes the positive pulse that may reset the latching pair. A resistor of 1Mohm is connected from capacitor C1 to the signal diode.
Puff to Off LED Circuit Working:

Initially, give the connections as shown in the circuit diagram.
Connect a battery of 5v as shown.
Now press the push button S1.
The transistors Q2 and Q3 wired as latching pair gets activated.
Thus drives the LED to glow.
While you puff on the MIC, the analog sound signal is converted into a voltage signal at its output.
This voltage is amplified by the transistor Q1.
The amplified signal is applied to the latching pair.
Thus base of the transistor gets the required voltage and PNP transistor stops conducting.
Thus LED stops glowing.
Now press the push button again so as to modify it again. Puff to Off LED Circuit Applications:

This can be utilized as a candle.
The circuit can be utilized as decorative item in church and during special occasions. Get an idea about the working of LED Christmas Lights Circuit.
Stained glass lamps & lanterns uses this circuit.
This may be utilized in arts and crafts applications.
Model railroading accessories utilizes this circuit.
This may be utilized in haunted houses and spooky lighting.
This may be utilized in automotive novelties.

remote switch for lights

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