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Old 28-01-2018, 06:25 PM   #1
justintime2001
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Default Can I shorten LED legs?

I want to add some LED's and resistors to my buffer stops. Is it ok to shorten the wire legs on the LED & Resistor to make them smaller? Thanks, Ian.
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Old 28-01-2018, 06:29 PM   #2
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Yes you can, Ian, just make a note which one is the positive (longer) leg.....not too short 'cos leds don't like heat from soldering irons......HB
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Old 28-01-2018, 06:32 PM   #3
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Yes, but don't cut them too short and be careful not to overheat them when soldering as that can cause failures. In and out quickly with a good hot soldering iron is the best way.
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Old 28-01-2018, 06:39 PM   #4
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Great news, thank you both.
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Old 28-01-2018, 07:31 PM   #5
Tricky Dicky
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On 5mm diam. and upwards the cathode (-) can be recognised by a small flat on the bottom rim of the LED nearest the shorter leg. On 3mm LEDs it is not always present and certainly not on smaller types.

Richard
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Old 28-01-2018, 07:34 PM   #6
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Quote:
Originally Posted by Tricky Dicky View Post
On 5mm diam. and upwards the cathode (-) can be recognised by a small flat on the bottom rim of the LED nearest the shorter leg. On 3mm LEDs it is not always present and certainly not on smaller types.

Richard
Thanks Richard. I will be using 3mm and I told the longer leg is the +.
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Old 28-01-2018, 08:38 PM   #7
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Before you start look at these. Rated for 12v and they actually look like buffer lamps.

https://rover.ebay.com/rover/0/0/0?m...2F111023863053
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Old 28-01-2018, 09:32 PM   #8
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Quote:
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Before you start look at these. Rated for 12v and they actually look like buffer lamps.

https://rover.ebay.com/rover/0/0/0?m...2F111023863053
Nice one Steve thank you, ordered them. That's going to save me some work
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Old 28-01-2018, 10:23 PM   #9
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Quote:
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Nice one Steve thank you, ordered them. That's going to save me some work
No problem. When you get them give them a coat of black paint then a top coat of your chosen colour but leave the lens part clean.
They may be a bit bright on 12v so either drop the voltage slightly (a variable controller will do - I mentioned them on another thread today) or put a drop of red paint on the lens.
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Old 28-01-2018, 11:20 PM   #10
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No problem. I use a lot of SMD (Surface Mounted Device) leds that have NO legs at all! Just tin both the device and the lead as usual and do not linger with the soldering iron!
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