Infrared Beam Kit

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Quoting product code: N37FL


About this product


  • Detect the presence of obstacles with this infrared transmitter/ receiver pair
  • An output relay is driven if the beam is broken
  • Could be used to detect intruders if the output is hooked up to an alarm

Product overview

• Detect the presence of obstacles with this infrared transmitter/ receiver pair
• An output relay is driven if the beam is broken
• Could be used to detect intruders if the output is hooked up to an alarm
• Also link it to the Ding Dong Kit (Order Code: N44FL) to form an automatic doorbell
• Transmitter and receiver each require a 9V PP3 or a DC 9V power supply

Rated 4 out of 5 by from i have to say, mine works fine, although I am very experienced with circuit building and fault finding, and have the stuff to d this. From habit, I never expect a circuit to work first time anyway. I find the distance of the beam to be pretty good and its quite a tight beam, meaning that you can find the edges easily - which makes mission Impossible style games fun. I haven't had any false triggering as mentioned here and all the parts were there. I wouldn't see this as a beginners project though. you also need to use your phone to check the LEDS are working!
Date published: 2014-11-11
Rated 4 out of 5 by from This circuit on the contrary of what people are saying works exactly how it was designed. You have a potentiometer too adjust the intensity of the light which therefor the sensitivity of the gate. the instructions were clear on what goes where and it was simple to construct. However you should realise when you buy this that there is a delay after the light gate has been broken. I was unaware of the delay on purchase and it does not suit my personal needs. It does what it is meant to though and I would recommend it to anyone if they simply needed a light gate to trigger something such as an alarm ect. I would recommend if you are looking to use this with the best control over it you should fix the seperate circuits to something.
Date published: 2014-11-11
Rated 1 out of 5 by from I have built four of these kits and they have all suffered from the same problem. I found it impossible to adjust them to get anywhere near an acceptable level of sensitivity/reliability operation. Also for no apparent reason they have the annoying habit of spurious triggering, even in the dark.
Date published: 2014-11-11
Rated 1 out of 5 by from I could not get the circuit even to work firstly some of the components were missing and secondly the instructions are not the easiest to follow. I do not recommend this circuit to any novice or beginners that want to make this type of circuit.i am disappointed
Date published: 2014-11-11
Rated 1 out of 5 by from Instructions poor as they don't tell you what the potentiometer does (is it a sensitivity level or tuning frequency adjust?). Could not get this to work reliably over any range and seems very directional over 10 feet apart. False alarms if bright sun shines on it. If you connect an alarm, it sounds all the time the beam is broken, possibly why the 'ding-dong' type alarm is recommended.
Date published: 2014-11-11
Rated 1 out of 5 by from needs work I got lazy and bought this instead of designing my own. First problem - the regulator supplied was a 7806 (6V) instead of the 7805 on the schematic.Given that some of the components have a 6V max rating, it's not good. I had a spare 7805 in a drawer, which was handy. Second problem - the design is wrong. What the parts list doesn't mention is that the IR receiver is (in my pack) a TSOP4838. Once you know that, you can understand a lot more about the design. After going through the datasheet, I realised that the transmitter timings were sub-optimal, and needed to change components. Third problem - the TSOP4838 expects a 38KHz carrier signal (the last 2 digits of the part number), but the supplied components are of such poor quality that the 555 timer oscillator stability is terrible, and drifts all over the place (mainly the capacitors). For anyone interested - the potentiometer adjusts the nominal 38KHz oscillation frequency. If you look at the TSOP4838 datasheet, you will see that it becomes less sensitive when off-frequency. All in all, not for beginners if you want to get a working, solid solution "out the box", but a great project to learn about 555 timers, frequency modulation, filters, and transistors. Oh, and you'll probably need a scope to figure out what's wrong.
Date published: 2017-01-13
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What are the dimensions?

Asked by: Lucy12345
I have booked the item of stock and will reply once we have this info.
Answered by: Dominic
Date published: 2017-11-29

I there a circuit diagam available?

Asked by: DaveG
The Data Sheet is available from the link below.
Answered by: darren cordon
Date published: 2017-07-24


As much as we would love to be able to help here, we cannot offer design project advice or assistance, we are more than happy to locate products and support you with your purchases but we are not able to design entire circuits or projects for you.
Answered by: Dale
Date published: 2017-03-10

What sort of current can the relay switch on and off? The voltage will be a maximum of 9 volts. Thanks, Charles.

Asked by: Charles
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below: 0333 400 9500 or email
Answered by: Billy
Date published: 2017-02-28

Q I want a I R device to stop auto garage door closing if the car is in its line ,the span I need the I R to operate is 5 metres ,  Ernie

Asked by: Ernie
Infrared Beam Kit will operate up to 5m. Code: N37FL
Answered by: darren cordon
Date published: 2017-02-05

What distance will the Transmitter/receiver work

Asked by: John
The range between the two p[arts is approximately 5M.
Answered by: Billy
Date published: 2016-09-27

do you supply any instructions on how to connect the ding dong kit to this one?
Asked by: Matty
No, we cannot provide instructions for cross kit circuit design I am sorry to say.
Answered by: Russell
Date published: 2016-08-16

Can I use 12volts dc supply to this module.

Asked by: Jimms
No, I am sorry but the item will not work for this use.
Answered by: Dominic
Date published: 2016-07-23
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