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BuildCircuit is an online store for selling electronics kits and components related to Arduino, Raspberry Pi, etc. We operate from Sydney, Australia.

We design and sell basic electronic kits and Arduino modules for all electronics enthusiasts.


LED chaser using NE555, CD4017, Infrared receiver and photoresistor

AU $14.95
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This product is shipped from Sydney, Australia. Worldwide shipping available- we ship to USA, Canada, New Zealand, UK, EU and Non-EU countries.

This is the modified version of a conventional LED chaser. We have modified this kit to respond to infrared and light. 

The kit does work normally like a normal LED chaser kit. In addition to its obvious features, it has a photoresistor that allows you to change the speed of the chasing LEDs. In the old LED chaser, the speed is controlled with a variable resistor. In this kit, we have used a photoresistor to work as a variable resistor. As the light falling on the photoresistor changes, the speed of the LEDs also changes.

You can set the kit to receive infrared signals. If you turn on this feature, the LED chaser works only when you press a remote control close to the infrared receiver.  

You can use both infrared and photoresistor features at the same time.  

How does it work ? 

NE555 timer has been configured in astable mode and CD4017 works as a decade counter. NE555 can be powered directly or via BC547 transistor. To change power source, you can use the SPDT switch IR func. Output of NE555 has been connected to CD4017. For each pulse generated by NE555, CD4017 lights up LEDs in a sequence.

A photoresistor has been connected to NE555. This has been used in place of variable resistor. When the light level falling on the photoresistor changes, the output frequency of NE555 changes and that consequently changes the LED running speed.

Make sure that you use a small piece of heat shrink tube block the light falling on the LDR. We will send you a piece of heat shrink tube. 


Operating voltage: 6V DC (Though the video shows 9V, you should use 6V, the voltage should not exceed 9V)

The PCB has been designed in a way that beginners can follow the silkscreen labels to solder the components. The components name have been labeled properly. There is an assembly tutorial at the end of this page. You can follow that to solder the kit properly. Beginner level knowledge in soldering is enough to build this kit. 

The kit package includes the following 38 components:

  1. 1 x Bare PCB
  2. 1 x CD4017
  3. 1 x NE555
  4. 1 x 16 pin DIL socket
  5. 1 x 8 pin DIL socket
  6. 1 x LDR/photoresistor
  7. 1 x TSOP4838 or TSOP1838 infrared sensor. 
  8. 1 x Screw terminal- 2 pin
  9. 1 x BC547
  10. 1 x BC557
  11. 1 x 1uF
  12. 1 x 100uF
  13. 1 x 1P DIP switch
  14. 2 x SPDT switch
  15. 10 x 5mm LED
  16. 3 x 5mm different color LEDs
  17. 6 x 1k Ohm resistor
  18. 2 x 470R resistors
  19. 1 x 470k Ohm resistor
  20. 1 x 9V battery connector




1. Assembly images- See how the components are soldered on the kit

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Information about shipping

BuildCircuit is a trustworthy online store established in Sydney, Australia. We have been maintaining our quick shipping service since we started the store in Turku, Finland(in 2012).

Shipping information for international customers

We ship our products to more than 45 countries using Australia Post. Our regular customers are from the USA, Canada and Europe. We are currently using four different shipping methods to ship the orders to international destinations. We request you to select 'Standard Post' or 'Registered Post' while checking out so that you can receive your package quickly.

We usually ship your orders within 1-2 days. Small orders are usually processed and shipped on the same day.

Shipping information for Australian customers

All the orders from Australia are shipped on the next day at 9.00AM. Orders with Express Australia Post are also shipped on the next day if your order is placed before 1.00PM. We provide tracking code for Standard, Registered and Express Post orders only.

Australia Post has never lost any package since we started our business in Ausralia. So, we request you all to buy with confidence.

Are we reliable ? How to know we are genuine sellers ? How is your payment safe ?

1. If you make a payment via Paypal and if we don't ship, you can open a case on Paypal and ask for refund. Paypal will be on your side and they will make full refund.

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4. We have a popular blog www.buildcircuit.com and people from all over the world read our posts. We are seriously in the business, therefore, we WILL ship your orders

For International Customers: For registered and express post orders, you will receive a notification on your email after the package is landed in your country. Examples given below:


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