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Old 03-02-2008, 04:23 AM #1
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Default Safe to cut alluminum tab off LM317T?

Does anyone know if it would be safe to cut the aluminum tab that sticks off the back of the Lm317T?
I would like to know for space saving purposes.
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Old 03-02-2008, 04:52 AM #2
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by tehk
Does anyone know if it would be safe to cut the aluminum tab that sticks off the back of the Lm317T?
I would like to know for space saving purposes.
Like this:
No problem there...It is a common practice for building!
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Old 03-02-2008, 05:45 AM #3
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Default Re: Safe to cut alluminum tab off LM317T?

Yes but you still need to remember the exposed metal on the back is Vout and if it touches metal inside your host.... BAD THINGS can happen. You can release the mysterious blue smoke. After that electronics don't work anymore.

They operate on smoke signals Let it out and poof! no more workies.
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Old 03-02-2008, 05:48 AM #4
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Default Re: Safe to cut alluminum tab off LM317T?

Good to know. Can save some space now
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Old 03-02-2008, 07:18 AM #5
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by BlueFusion
Yes but you still need to remember the exposed metal on the back is Vout and if it touches metal inside your host.... BAD THINGS can happen. You can release the mysterious blue smoke. After that electronics don't work anymore.

They operate on smoke signals Let it out and poof! no more workies.
And that smoke smells sooooo good... ;D
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Old 03-02-2008, 08:34 AM #6
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Default Re: Safe to cut alluminum tab off LM317T?

I may just have to fry one to experience this magic blue smoke :P
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Old 03-02-2008, 11:42 AM #7
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by tehk
Does anyone know if it would be safe to cut the aluminum tab that sticks off the back of the Lm317T?
I would like to know for space saving purposes.
Like this:
As was mentioned:

1. Yes, it's OK
2. BTW, it's not Aluminium (plated copper perhaps?)
3. Don't short it to anything
4. Doing this will reduce the upper current carrying capacity of the IC (less thermal dissipation)
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Old 03-02-2008, 05:11 PM #8
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Default Re: Safe to cut alluminum tab off LM317T?

If this is to be used with a fixed resistor you can do this with it and it will fit in a very small space......I did this for my red burner, it solders straight onto the circuit board of the host torch.

Regards rog8811
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Old 03-02-2008, 10:55 PM #9
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Default Re: Safe to cut alluminum tab off LM317T?

hey bluefusion did you already sent to me the schematic diagram you are saying to my email? please inform me, thanks.
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Old 03-03-2008, 12:35 AM #10
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by rog8811
If this is to be used with a fixed resistor you can do this with it and it will fit in a very small space......I did this for my red burner, it solders straight onto the circuit board of the host torch.

Regards rog8811
That's pretty cool . I'm attempting to fit this in a 15mmx150mm flashlight tube. Everything needs to fit on either side of a little PCB board.
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Old 03-03-2008, 05:37 AM #11
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Default Re: Safe to cut alluminum tab off LM317T?

Read datasheet.

There are different packages:

SOT-223
TO-252
TO-263
KTE
D2 PAK

Or try version for kids ;-)

LM317L 100mA - TO92, SOP-8 and micro SMD package.

Beauty...
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Old 03-03-2008, 05:56 PM #12
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by chimo
2. BTW, it's not Aluminium (plated copper perhaps?)
Yeah it looks like it's plated copper.
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Old 03-03-2008, 06:00 PM #13
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Yeah it looks like it's plated copper
It certainly is, which is why you can solder the resistor across the top as shown in my sketch above.

Regards rog8811
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Old 03-03-2008, 10:57 PM #14
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Default Re: Safe to cut alluminum tab off LM317T?

Quote:
Originally Posted by rog8811
If this is to be used with a fixed resistor you can do this with it and it will fit in a very small space......I did this for my red burner, it solders straight onto the circuit board of the host torch.

Regards rog8811
So you just move the resistor(s) to that position and it gives the same result? So it will look somewhat like this?:
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Safe to cut alluminum tab off LM317T?-driver_edit.jpg  
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Old 03-04-2008, 07:17 AM #15
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Default Re: Safe to cut alluminum tab off LM317T?

You only need to do it if you are working in a confined space such as a flashlight. And you don't need the pot as long as you know how much current the diode is capable of. The pot is more trouble than it is worth...IMO.
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Old 03-04-2008, 04:41 PM #16
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Default Re: Safe to cut alluminum tab off LM317T?

Well i don't really know, I read somewhere that senkat's open can ones do ~250mw with plastic lens and ~300mw with glass but mines a 20x so i haven't seen what it's supposed to do.
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