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Old 6th January 2006, 11:20 AM   #51
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by 6h5c

I see you have C901/902 still in there, that lead to the headphone part. These traces run alongside the DAC and will take some noise with them, right into the analog part. If you take them out you can prevent that. While you are at it, take out U139/140 to disable the +/- 12V.
Looks like a nice little mod. I simply unplugged my headphone socket, but I will go further and do as you suggest here. I would actually use the socket with my Sennheiser HD600s, but it sounds bloody awful!!! The cans are restricted to compuer use
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Old 6th January 2006, 11:26 AM   #52
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister


Does anyone know the cheapest place to get these OPA627 from?
I got my OPA627BP for free using the BB sample program.
They must have ran out, because they don't offer it anymore

Ray.
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Old 6th January 2006, 11:30 AM   #53
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That makes me feel better cheers

I can get them through work for 25 each (OPA627 S08) and I need 4
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Old 6th January 2006, 11:47 AM   #54
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
That makes me feel better cheers

I can get them through work for 25 each (OPA627 S08) and I need 4
Sorry, couldn't resist....

www.farnell.com is a little cheaper, especially if you are satisfied with the A grade. But why do you want to use four of them? You can use a cheaper one in the filter, it's less critical. And it will make your player sound less ''Brown'', if you know what I mean.

If you look in my opamp list you'll see OPA124 has good spec's also.
You can also sign up with Analog's sample program and get some AD8610, for free

Ray.
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Old 6th January 2006, 11:49 AM   #55
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Wow. Turn your back for a minute and there's a million posts!

I got my opa627's from usacaps on ebay. Cost about $20 for 5.
Dip rather than so8 though.

Regarding the audiocom regs, I remember some grumbling on the forums that these were not that great....I'm no expert here, but it might be worth some investigation before spending your money.

I notice tentlabs have just released some similar devices, and then there's the ALW jung superregs...

Just to complicate things.
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Old 6th January 2006, 12:00 PM   #56
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OPA124.. mmmmm

So what you are saying is that 4X opa627 is not very good?

If I buy 2 opa124 does this solder to the bottom of the browndog pcb or the top?

I like the audiocom regs, they are worth the ebay prices!
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Old 6th January 2006, 12:16 PM   #57
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
OPA124.. mmmmm

So what you are saying is that 4X opa627 is not very good?

If I buy 2 opa124 does this solder to the bottom of the browndog pcb or the top?
It is good, but there are even better and cheaper alternatives, even for free if you use the sample programs. I didn't pay for all of these

The OPA124 or AD8610 can be used instead of OPA627 after the DAC, and then goes on top of the adapter, that's IC1. In the filter I use OPA132, AD8510 or also AD8610, this goes on the bottom.

If you look in the opamp table you can pick one that has nice specs. For the DAC low input offset voltage and low input bias current seems to work well. The more yellow the better.

Ray.
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Old 6th January 2006, 12:37 PM   #58
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LOL nice stock. It looks a like my stock of eproms I program for car ecu's.

I have purchased 2X OPA627AU and 2X OPA124UA from Farnell.

They came to 42 ish. I thought this was ok.

So with these chips I put OPA124 ontop (ic1) and the OPA627 on the bottom (ic2)

I have just ordered some gold plated sockets for the pcb to fit into also
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Old 6th January 2006, 12:39 PM   #59
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Nice ordering work there Brent.... and the final step will be psu bypass on the 'dogs.
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Old 6th January 2006, 12:52 PM   #60
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
LOL nice stock. It looks a like my stock of eproms I program for car ecu's.

I have purchased 2X OPA627AU and 2X OPA124UA from Farnell.

They came to 42 ish. I thought this was ok.

So with these chips I put OPA124 ontop (ic1) and the OPA627 on the bottom (ic2)

I have just ordered some gold plated sockets for the pcb to fit into also
Hi,

No, i'm afraid you didn't read everything and ordered too fast.

The OPA124 or AD8610 can be used INSTEAD of OPA627 after the DAC, and then goes on top of the adapter, that's IC1. In the filter I use OPA132, AD8510 or also AD8610, this goes on the bottom, so that would be IC2 on the adapter.

Ray.
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