MK120 IR Light Barrier

Is there a circuit diagram available for this kit? My kit doesn’t work and I’d like to fault find without reverse engineering from the pcb.

Also, how directional is the IR pair? I’d like to modify 2 kits, mounted on portable tripods and add a timing facility with a PIC and lcd display, but it wouldn’t be very practical if the alignment is hypersensitive!

Many thanks

We are afraid that the alignment is hypersensitive.
Diagrams can be downloaded at the bottom of this page:

http://www.velleman.be/be/en/product/view/?id=342937

Many thanks. It was lucky I had one last try … and spotted a dry joint on the receiver led!

It works fine and the sensitivity is not a problem for the units placed without much effort about 4m apart.