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Old 14th June 2002, 10:03 PM   #1
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Default Decoupling caps for AD825 board

I wish to put together a drop-in op-amp board based around two AD825, like the one LC audio produces.
Where do the decoupling caps go? What values, and should they be bypassed with smaller caps?
Also, does the quality of the cap matter, if so, what do you recommend for a cost effective project.

The reason I want to do it myself is that the cost is much less compared to the ready assembled LC Audio units.
Thanks
Marius
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Old 15th June 2002, 12:24 AM   #2
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This is already a done deal. There are at least a dozen threads on this board, HeadWize, and Head-Fi that talk about the BrownDog adapters.

You probably don't need those caps, btw. The adapters don't use them. I have used these adapters with AD825, AD8610, AD8065, and AD8620 opamps, among others.

http://brndog.com/SingletoDual.html
http://brndog.com/so8.html
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Old 15th June 2002, 12:43 PM   #3
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you could go with ready made boards or you could make one yourself
i built my pcb myself
since i designed myself i could include some space for the decoupling caps
i used 0.1 ceramix x7r and 10 uf electro
you could use 0.1 film and foil or use 0.1 blackgate's high q value for this
i think lcaudio uses 47 uf tantulum from avx
read from their website
making the pcb and etch is a bitch
but you learn something really new
soldering the smd ins't that hard, little effort only
slightly steady hand will do.
most of my time was on etching the board
do so if you really want to save money

write if you want the schematic
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Old 17th June 2002, 06:30 PM   #4
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Location: London UK
Default Re: Decoupling caps for AD825 board

Quote:
Originally posted by royalmp2001
I wish to put together a drop-in op-amp board based around two AD825, like the one LC audio produces.
Where do the decoupling caps go? What values, and should they be bypassed with smaller caps?
Also, does the quality of the cap matter, if so, what do you recommend for a cost effective project.

The reason I want to do it myself is that the cost is much less compared to the ready assembled LC Audio units.
Thanks
Marius
--------------------------------------------------------------

You don't need them if you have a decent ps and circuit. You can always implement at board level if you must.

I find it somewhat amusing that people are talking about these things even in multi-cap buss ps distributions.
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Old 18th June 2002, 12:24 AM   #5
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Thumbs up Hey, NickC.....Yes please

Quote:
Originally posted by NickC

write if you want the schematic [/B]
Regarding your homemade pcb for the AD825s and decoupling caps.....yes I would like the schematics.
Contact me at :

royalmp2001@hotpop.com

Thanks
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Old 18th June 2002, 06:41 AM   #6
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A: Nowhere if you plan on using those tiny silver mica ones they do. Lot of the good they do.

Jocko
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Old 18th June 2002, 10:33 AM   #7
UrSv is offline UrSv  Sweden
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Jocko,

"Lot of the good they do" being either Yoda English for GOOD or plain higher level English for BAD, would you mind to tell me what I did not understand. Are the silver micas GOOD or BAD in that place?

Thanks/UrSv

(A lot of stuff know I not)
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Old 18th June 2002, 04:48 PM   #8
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Not that they are "bad" (some might think so), but the values are too small to be of any real benefit. At least 0.01 uF would be where I would start.

Jocko
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