Tsukure Mad Labs Audible Pendulum

Electronic clock with LED pendulum & tick tock sound produces Tick Tock sound every second and it has a LED pendulum in which 6 LED glow in forward and reverse sequence like a Pendulum, each LED glow in one second. This circuit is very useful and inexpensive. You can build your own clock which can be used in  many applications like toys, robots etc.  To create this circuit we have mainly used 555 timer IC, 4017 IC and a speaker. We have used 555 IC to produce the clock pulse every second and 4017 as a decade counter to glow the LEDs in sequence.

4017 IC is a CMOS decade counter chip. It can produce output at the 10 pins (Q0 – Q9) sequentially, means it produce output one by one at the 10 output pins. This output is controlled through the clock pulse at PIN 14. At first, output at Q0 (PIN 3) is HIGH, then with each clock pulse, output advance to the next PIN. Like one clock pulse makes the Q0 LOW and Q1 HIGH, and then the next clock pulse makes the Q1 LOW and Q2 HIGH, and so on. After the Q9, it will start from the Q0 again. So it creates sequential ON and OFF of all the 10 OUTPUT PINs.


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 100uF Capacitor (Polarized)
1 10uF Capacitor (Polarized)
8 1N4148 Diode
1 555 Timer Integrated Circuit (IC)
1 CD4017 Integrated Circuit (IC)
6 5mm Blue (Diffused) LED
1 1 Watt / 8 Ohm Full Range (2.8 cm) Loudspeaker
1 Tsukure Mad Labs - Audible Pendulum PCB
2 1K
[ Brown, Black, Black, Brown ]
Resistor (0.25 Watt)
1 100K Resistor (Potentiometer / Variable)

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.

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