Home-made assembled LDR or which commercial RoHS LDR? - diyAudio
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Old 13th October 2015, 11:58 AM   #1
tfboy is offline tfboy  United Kingdom
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Default Home-made assembled LDR or which commercial RoHS LDR?

Has anyone here just made one up?
I mean grabbing an LED, a photoresistor and holding them together with some light-resistive heatshrink?

Considering how variable commercial units seem to be and the efforts to make matching pairs as much as possible, I'm surprised I can't find any threads about making up your own.

ESP touched on this very topic here: Project 145

You can easily make them up at a fraction of the cost of industrial-made units, and you can probably play around with them a bit, tweaking distances, etc, to try and get matching pairs...

The other reason I started thinking about making up my own is that the two or three manufacturers I have found who make LDRs appear not to be RoHS compliant. The Advanced Photonix NSL-32SR and their variants aren't RoHS apparently. Neither are Excelitas Tech range...

For the cost of a few pennies, I'm going to put some together and will report back, but if anyone else has tried this, I'd love to hear your experience.
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Old 13th October 2015, 12:00 PM   #2
kaputt is offline kaputt  Germany
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Why do you need RoHS compliance?
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Old 13th October 2015, 12:04 PM   #3
tfboy is offline tfboy  United Kingdom
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Quote:
Originally Posted by kaputt View Post
Why do you need RoHS compliance?
A couple of reasons.
1. I'm putting together a product that may end up being part of a bigger commercial one.
2. It gives me warmer fuzzy feeling knowing it's approved by the sandal-wearing, tree-hugging european bureaucrats
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Old 13th October 2015, 12:52 PM   #4
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Can a LDR be RoHS compliant?
They use materials like cadmium sulphide
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Old 13th October 2015, 01:00 PM   #5
tfboy is offline tfboy  United Kingdom
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I wondered about that David.
It seems to be the photoresistive element that's problematic. Most of them aren't RoHS, but some are like Velleman's LDR04.
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Old 14th October 2015, 03:03 AM   #6
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I can only find that on the CPC website, which is down.
Velleman is a wholesaler, not a manufacturer, so I would want to double check that RoHS status
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Old 14th October 2015, 03:13 AM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by tfboy View Post
Has anyone here just made one up?
I mean grabbing an LED, a photoresistor and holding them together with some light-resistive heatshrink?
I use nothing else

That said, I also guess that the actual non approved stuff is the cadmium sulfide itself.

Which would be very very ridiculous.
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Old 14th October 2015, 05:49 AM   #8
Enzo is offline Enzo  United States
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If cadmium is not legal there, and you are making a commercial product, it would seem to me that the prudent approach would be to not use cadmium bearing components.
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Old 14th October 2015, 07:17 AM   #9
JMFahey is offline JMFahey  Argentina
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No commercial ROHS compliant LDRs , period.
There are a few exceptions for Medical or Military use, I bet they need a ton of red tape to get through.
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Old 14th October 2015, 09:55 AM   #10
DF96 is offline DF96  England
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An LDR is a photo resistor, just a photo resistor - the clue is in the name: Light Dependent Resistor. Add an LED and you no longer have an LDR, but a photocoupler. Can we get the names right, so we don't confuse each other?
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