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Old 12-18-2010, 09:05 AM #1
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Default Capasitor question in Laser driver

Dear All,

I am trying to build my first laser driver and I used scheme given for example on this web-Site:

Laser driver - It can be done

Instead of using 10mF capasitor i just put 2000mF (because this was the one I found at home Of course I can go and buy 10mF as shown on the scheme) But my question is - Using 2000mF will do nothing bad, will it ?

It will juat take more time (fractions of seconds while capasitor is being charged) till LD begins to emit laser ? Correct ?

Thanks


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Old 12-18-2010, 09:38 AM #2
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Default Re: Capasitor question in Laser driver

for your first laser driver best to get all the right parts
the CAPACITOR filters out any voltage spikes that could kill the diode, although i use 47uf 10v electrolytic caps

Last edited by TTerbo; 12-18-2010 at 09:41 AM.
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Old 12-18-2010, 02:54 PM #3
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Default Re: Capasitor question in Laser driver

Neitrino;

Roger's circuit will still work with the larger capacitor.

I like a smaller tantalum (1uf) for better spike protection.

This is a 10uf photo of the type I use:



The 1 uf would be marked "105" .

The "E" denotes 25 VDC.

You can find them on many surplus circuit boards.

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