Old 07-09-2011, 07:07 AM #1
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Default are you familiar with drivers/circuits?

i got two 200mw modules from the same company and i noticed that one of the drivers was missing a part(circled below) anyone know what that is for?




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Old 07-09-2011, 07:37 AM #2
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Default Re: are you familiar with drivers/circuits?

Its a capacitor. Complete guess, Output smoothing? Feels wrong. Too small for smoothing on a 200mw module I would think. AKA no idea
What company are they from?
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Old 07-09-2011, 07:55 AM #3
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Default Re: are you familiar with drivers/circuits?

If it's connected in parallel to the LD, is a filtering capacitor ..... not extremely important, it can work good also without it.

If instead is connected to the IC, it can be for filter away some disturbs in the feedback circuit ..... if the module is operated only with battery and used in some metallic host (like handhelds), it's not too important, it can be ignored, but if you plan to use it with an AC adaptor or in a machine, unshielded, it can cause some instability ..... anyway, indicatively any value from 1nF to 10nF can be used for substitute it, if is really needed.
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