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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 the power source, you can use the SPDT switch IR func. The 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 the 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 component's name has 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

  • All the order are shipped within 2 business days. 
  • Products are either shipped from China or Australia. Item locations are mentioned on the product page.
  • Customers will receive tracking code if they have selected the 'shipping method with a tracking code'.
  • Returns are accepted if the customers return the items within 1 month to our address in Australia. If the item has been shipped from China, the customer still has to return the item to Australia. 
  • Return post fees have to be paid by customers. If the product is defective, we will pay the shipping fees.


Shipping fees for Australian addresses(Item Location: Australia):

  • Standard Post- using Australia Post: US $5.95 ~ AU $9.00 
  • Express Post: US $9.95 ~ AU $15.00


Shipping fees for international addresses (Item Location: Australia):

  • Standard Post with tracking code: US $17.50 ~ AU $26.50
  • Express Post with tracking code: US $36.50 ~ AU $55.00


Shipping fees for Australian and international addresses:(Item location: China):

  • Registered post with a tracking code: US $3.95 ~ AU $6.00 
  • Express Post with tracking code: US $25.00 ~ AU $38.00 


How long does it take to reach the USA, UK, Germany, Australia Canada and other EU countries?  

From China: If we ship from China, the delivery time can be from 7 working days to 15 working days. See the proof on the images below. US based orders are delivered more quickly than other countries.

Most of the USA, UK, Canada, Australia, and Germany  based orders are delivered within 7 days. However, because of customs related processes, it can sometimes take up to 15 days.  Check out all the shipment proof images on this page. 


From Australia: If you have chosen standard post, you will receive your parcel in 3-5 days (in Australia) and 5-7 days (outside Australia)

If you have chosen economy post, you will receive your parcel in 3-5 days (in Australia) and 15-25 days (outside Australia)


What is the proof that we really ship and they are delivered ?

 Check out all the shipment proof images on this page. 


Where do we ship from ? 

We ship our products from Australia and China depending upon what you purchase. BuildCircuit's original products are shipped from Australia. 

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