IR Cannon w/Adjustable Focus

alastairstevenson

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Wow!
I'll bet that the feed from the mains downconvertor isn't HiPot isolated, and one of those wires is directly connected to the incoming mains. Hopefully the neutral wire.
Is the case connected to earth/ground? The only insulation seems to be the screen print on the heatsink plate.
 

AP514

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That 3-lens, 5-80 degree adjustable focus 850nm light from Aliexpress looks like one I got several years ago. Cheaply made, of course; the angle adjustment knob was very stiff but it did work. Eventually an internal circuit failed and I cut it open to have a look. Interestingly, most of the interior volume is a cylindrical finned heatsink that the three IR LEDs sit on, and the whole thing slides back and forth inside the case behind the lenses, to change the illumination angle.
View attachment 52450
So, would you Purchase these again ??? on sale ATM $45
 

cam235

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So, would you Purchase these again ??? on sale ATM $45
I have another one that I'm still using. For $45 I think it's a reasonable value if you need that much range. Almost all IR lights on the market are some kind of wide-angle, short effective range floodlight. There isn't much else out there with that tight a beam and long effective range, unless you make one yourself.
 
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