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Old 05-11-2011, 02:18 PM #1
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Default LM317 driver Capacitor

I have all the parts for lm 317 driver and i have question
wich capacitor i need for driver?
parts are:
3ohm 1/2w resistor
lm317T
1n5819 or 1n4007
and 22mF 25V capacitor
soon i'll get breadboard i'm waitin for shipping
is it ready to assemble?
and can static electricity from my hand kill these parts?



Last edited by personx910; 05-11-2011 at 02:22 PM.
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Old 05-11-2011, 02:45 PM #2
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Default Re: LM317 driver Capacitor

static is very unlikely to kill parts of your driver, but laser diodes are very sensitive
to static discharge.
You don't need a capacitor, in fact the simplest LM317 driver has no parts other
than the LM317 IC and a resistor.
The diode is just used to protect from reverse polarity, the (input) capacitor is supposed
to filter noise from the power source.
An output capacitor is supposed to stabilize the output of the LM317, but I found
that you don't need any, it is stable as it is even without a output capacitor.
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Old 05-11-2011, 03:20 PM #3
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Default Re: LM317 driver Capacitor

The capacitor you have listed will work fine. If you choose to incorporate the cap in your build be sure to discharg it before. Connecting your driver to your LD.
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Old 05-11-2011, 04:04 PM #4
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Default Re: LM317 driver Capacitor

In answer to your question I believe in the original tutorial it was a 16V 47uF Cap. Anyone feel free to correct me if I'm wrong.
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Old 05-14-2011, 01:31 PM #5
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Default Re: LM317 driver Capacitor

Thanks for answer : )
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Old 05-14-2011, 01:40 PM #6
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Default Re: LM317 driver Capacitor

That cap will work fine and if you put a high value resistor like a 3000ohm acros the cap it will help discharge it when power is removed and that will help to keep from blowing up your diode, it's not nessary though.

in order to kill them parts with static you would have to drag your feet on the carpet and build up a great big charge, not likely your going to kill them with static.
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