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Old 23rd June 2012, 05:37 AM   #21
naf is offline naf  Indonesia
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I think he want to ask howto set ccs, bias and offset properly. He confuse about zener and resistor r18, d3. All you ask was covered in build guide. Download and read carefully.
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Old 23rd June 2012, 05:54 AM   #22
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Since the location of the build guide was mysterious, here is a direct link to it. . . click here.
It is actually located in the store, with the boards if one notices the buttons to click on at the bottom of the page, if one happened to scroll down by either chance or curiosity.

Edit:
Moderator, feel free to remove this post after locating an obvious link to the build guide at post 1, if you want to.
Although post 1 is older than the build guide; however, this being a "build thread" doesn't need to postpone a link to the most crucial document, waaayyy down here at post 23.
Thanks.
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Last edited by danielwritesbac; 23rd June 2012 at 06:11 AM.
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Old 25th June 2012, 01:07 AM   #23
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Quote:
Originally Posted by danielwritesbac View Post
Good job getting the boards in the store.
@Variac, feel free to edit, revise or recycle this post.

A version of the schematic with white background for easy printing:
Click the image to open in full size.
A direct link to the original documents.
Parts list attached below:

I think I see an error in the values of "R51" and "R52" would not have to be different.
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Old 25th June 2012, 09:14 AM   #24
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Quote:
Originally Posted by luisitoloco22 View Post
I think I see an error in the values of "R51" and "R52" would not have to be different.
It's possible ostripper was compensating for the high brightness blue LED. D6 is supposed to be a standard red.
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Old 25th June 2012, 05:54 PM   #25
mattmcl is offline mattmcl  United States
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Has anyone created a Mouser BOM for this amp yet? I started on it but I'm a bit of a noob and got confused on the types of resistors (ceramic, carbon, film, etc) that would be best.
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Old 25th June 2012, 06:43 PM   #26
SoIL4x4 is offline SoIL4x4  United States
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Quote:
Originally Posted by mattmcl View Post
Has anyone created a Mouser BOM for this amp yet? I started on it but I'm a bit of a noob and got confused on the types of resistors (ceramic, carbon, film, etc) that would be best.
I put together a BOM from digikey for the softstart and the power supply, but like you got stuck on the amp. There are so many configuration options that will dictate component choice and value. It became confusing. I decided to put this on the back burner because I have a few other projects ahead of it and I want to be able to give this my full attention.

If you want the part numbers I chose for the softstart and power supply let me know. The power supply components were chosen to be used with the diystore boards. I picked the highest amount of capacitance that will fit on these boards that would still offer a safe working voltage threshold with +-64V rails.
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Old 26th June 2012, 03:17 AM   #27
mattmcl is offline mattmcl  United States
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No, that's OK. Those are the parts I have done too!
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Old 30th June 2012, 09:39 PM   #28
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i wrote to OS about resistors aroud red and blue light ...... time ago .... and resistors are different to match led current and efficiency.
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Old 1st July 2012, 01:44 AM   #29
naf is offline naf  Indonesia
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@audiofan: thanks for clarification of R51 and R52
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Old 2nd July 2012, 04:36 AM   #30
naf is offline naf  Indonesia
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I've sourced 2SC3503, but difficult to source 2SA1381 in my country.
How about 2SA1209 to replace 2SA1381, or i just use MJE350
Any suggestion?
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