Tsukure Studio Dancing LED's

You must have seen the Disco Lights or DJ lights, which flash ON and OFF according to the beats of the music. These lights glow according to the length and pitch (volume) of music beats, basically these are designed to pick the high intensity sound like Bass sound. So these lights follow the high pitch beats in music like drum beats, and Turn ON and OFF according to music pattern. However the sensitivity of the circuit can be increased to pick the low notes too.

In this Simple LED Music Light Circuit, condenser mic picks up the sound signals and converts them into voltage levels. These voltage signals are further fed into R-C filter or HIGH PASS filter, to eliminate the noise from the sound. Further a NPN transistor (BC547) is used to amplify the signals, from the High Pass filter. Then finally these music signals are given to the array of four transistors. Transistor in this array works as amplifier, and glows the four LEDs according to the sound pattern. This generates a very interesting sequence of dancing LEDs which follows the beats as per their intensity or pitch. We can also add more LEDs with transistor to make it cooler.

Components used in this module...

Find out more about the components used in this STEM Module.

Let's Get Started!

Below you will find a list of bits to gather before hand, followed by a detailed schematic. Using a breadboard lay out the components and connect them together as shown. Alternatively you can purchase this module from our shop and simply solder the components in the places indicated on the quality assured printed circuit boards provided.


What You Need...


1 9V Black Battery Holder Clip Snap On Connector Cable Battery / Battery Holder
1 104 (100nF / 0.1uF) Capacitor (Ceramic)
4 5mm White (Clear) LED
1 Electret Microphone Microphone
1 Tsukure Studio - Dancing LEDs PCB
2 10K
[ Brown, Black, Black, Red ]
Resistor (0.25 Watt)
4 1K
[ Brown, Black, Black, Brown ]
Resistor (0.25 Watt)
1 1M
[ Brown, Black, Black, Yellow ]
Resistor (0.25 Watt)
5 BC547 Transistor (NPN)

NB: Any resistor colour codes specified relate to 5 band resistor codes, the 5th band has not been shown intentionally. The 5th band indicates the resistor tolerence, we use only the highest tolerence resistors in our products.

Take a Closer Look!


Let's Get Building!

We to build, so let's get to it! Gather your components as specified in the components list above, or simply order one of our project packs and tip the contents out onto your table or desk.

Solder station warmed up! Snips at the ready! Here we go!


Step 1) Getting Started

Before we begin placing components and soldering we should first place your components in a small tub so that they don't roll off your table or get lost.

Lay the PCB out infront of you and take a close look at all the components we will be using.

Furher explanations and detailed specifications of all these components can be found in our Wiki.

Step 2) Placing the LEDs

Now that we have all the components laid out before us we can begin to place components and solder them to the PCB.

LEDs are little lights that glow when a low DC voltage is applied, being diodes they must be inserted in to the PCB in the correct way.All Tsukure PCBs will indicate on the silk screen the correct positioning of each LED. To be sure check each LED and you will notice a long pin and a short pin. The long pin is positive and the short pin is negative. The short pin is also identified by a flat side to the LED. 

Line up the flat side of the LED with the flatside of the silk screen graphic LED. 

When you are happy all LEDs are place correctly use some BluTack to hold them in place or bend the pins slightly and solder them. Snip the pin excess when you have finished and move on to the next step.

Step 3) Add the Transistors

Now we shall place the transistors on the board. Transistors have 3 pins, which consists of Base, Collector and Emitter. As with the LEDs, transistors must be inserted into the PCB in the correct way. Also like LEDs, modern transistors, the small black ones we aree using in the project, have a flat side to their design. This flat side of the transistor should be alined with the silk screen graphic on the PCB and all 5 transistors placed. 

Use BluTack to hold the components in place. (You may need to bend the outer pins slightly in order to home the transistor and seat it on the PCB). When you are satisfied with the positioning of the components proceed with soldering.

Step 4) Resistance isn't Futile!

This project uses 7 resistors, when placing the resistors on the PCB ensure to check the colour bands closely as there are several different values used on the board (as indicated by the silk screen). The colour coding of the resistors is specified in the component list.

Step 5) Adding Capacitors

We are almost finished!

This project uses two types of capacitor, a ceramic, non-polorized capacitor and a cylindrical, polarized capacitor. It is very obvious from the solik screen image and by now we are sure you're getting the hang of it!

Never the less, if this is your first encounter with capacitors, please be aware of the following;

Ceramic capacitors (small orange/red component) may be positioned on the board in either direction, homwever the cylindrical polarized capacitor must be place in a specific orientation. This can be determined by identifying the "negative" strip that run down the negative side and a "long" pin indicating the positive side.

On the PCB you will notice the positive pin is identified by a small + symbol. 

When you are happy you have placed these two components in the correct location and position, continue with soldering and move on to the next step.

Step 6) Connecting Power!

All that is left now is to connect the power which is entirely your descision. You may decide to use the included blue connector to make switching power sources simpler or you may opt to use a battery holder. What ever you decide we know you'll make the right descision! Now switch it on, place it by a speaker and lets have a party!


Moving Pictures!

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Required Products

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