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Clap the light up!! A bracelet that lights up when you clap.

Step 1: Components Needed

  1. Mic (I took it from one of non working earphones)
  2. Potentiometer 10K
  3. Resistance 1k
  4. Colored LEDS – 8
  5. Transparent plastic pipe. (Diameter approx 1 cm)
  6. NPN transistors – 2
  7. 3v lithium cell
  8. Battery cap

Few wires, soldering iron, and a small piece of GPB and there you go!

Step 2: Basic Circuit & Working

Working :

We will use two transistors in cascade to provide amplification of current. Using two transistors will be enough to light up 7-8 leds using just 3v supply.

According to our circuit, the LEDs will glow only when Q2 turns ON, thus providing a ground path to LEDS. Q2 will turn on when Q1 does not conduct. So, we have to set the potentiometer in such a way that when you clap, only at that time the Q1 goes off. This value usually comes in between 4-4.5 k.

Note: Be careful about checking out positive and negative terminals of mic before soldering. Otherwise you may not get the output.

Step 3: Let’s Get Started:

Mount the above circuit on a small piece of GPB. Since we are making a wearable, we will try our best to adjust it all in the smallest size possible. (Image:1)

Cut out the unused portion of the board.

Next, solder the MIC and the battery cap.

And then connect LEDs in parallel.(Image:2)

After connecting it to the circuit, set the potentiometer.

Done?

Place it inside the tube.(Image:3)

We have covered the circuit with a thread. A hole is made in the pipe and ribbon has been taken out from it. A similar hole on the other end, and there you go!!

Step 4: Final Output

Yay! its finally made!! So clap on!

It is combine effort of Me, Jenni Shah, Prachi Parikh and Ishita Shah.

<p>Hello Anool, <br>Understood the mistake. I rearrange it and uploaded new circuit.<br>Thank you.</p>
<p>Sohil, something seems odd with your schematic. Battery [+] is getting connected to GND. Perhaps you meant it to be as per the attached schematic.</p>
Very cool.
<p>Nice work! That looks like a fun bracelet!</p>

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