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-   -   LM3875 dual mono (Carlosfm/BrianGT) (http://www.diyaudio.com/forums/chip-amps/91281-lm3875-dual-mono-carlosfm-briangt.html)

 Kooka 29th November 2006 11:35 PM

LM3875 dual mono (Carlosfm/BrianGT)

Hi, stupid question here.
I assembled some months ago these boards and lost my assembling instructions.

Now I want to install the led (place is on the PS board), but I guess I have to put in place R5 since it seems to be in series with the led.
Anybody could tell me what value is the R5 resistor? Is that all I need to install the led on that board?

 falcott 30th November 2006 02:50 AM

Hi there,
if you go to chipamp.com (BrianGT's site) you can find the build instructions for his LM3886 with CarlosFM's PS. In there he gives the R5 value (if using a blue LED) of 10k, or 22k if you don't want it so bright.

You can work out the value of R5 by using Ohms Law: R = V / I where R is the resistor you need, V is the voltage difference between the supply and what the LED needs, and I is the current of the LED in amps...

 Kooka 30th November 2006 07:43 AM

Quote:
 Originally posted by falcott Hi there, if you go to chipamp.com (BrianGT's site) you can find the build instructions for his LM3886 with CarlosFM's PS. In there he gives the R5 value (if using a blue LED) of 10k, or 22k if you don't want it so bright. You can work out the value of R5 by using Ohms Law: R = V / I where R is the resistor you need, V is the voltage difference between the supply and what the LED needs, and I is the current of the LED in amps...
Superexplanation, thanks!

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