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Old 6th April 2006, 04:16 PM   #1601
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Old 6th April 2006, 04:17 PM   #1602
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Old 6th April 2006, 04:18 PM   #1603
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Old 6th April 2006, 06:22 PM   #1604
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
Anybody who wants to do the reg upgrade, look at this and see how easy it is. I have used LM1084 which are lower noise than 7805.

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Hi Brent,

Nice photo's, good job. That reg PCB looks very neat. I was just looking into some regulator data, cause i'll be doing some separate regs too in a while. Still haven't decided on what regs to use.
Isn't the noise for these regulators (LM/LT1084...86, LM317) a typical 0,003% of Vout? That means 150uV at 5V out, while a standard 7805 does 40uV.

Regards,

Ray.
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Old 6th April 2006, 07:10 PM   #1605
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Quote:
Originally posted by 6h5c


Hi Brent,

Nice photo's, good job. That reg PCB looks very neat. I was just looking into some regulator data, cause i'll be doing some separate regs too in a while. Still haven't decided on what regs to use.
Isn't the noise for these regulators (LM/LT1084...86, LM317) a typical 0,003% of Vout? That means 150uV at 5V out, while a standard 7805 does 40uV.

Regards,

Ray.
Off the top of my head im not sure. I used 7805 for my servo reg pcb on my uber player and found the 1084/86 adj gave me better bass and a slightly better bass.

I also have some plastic caps to fit across the caps after the regs.

Brent
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Old 6th April 2006, 08:00 PM   #1606
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Hi all

Hope this isn't a stupid question. I am getting ready to order the brownbog pcb's
for single to dual using OPA627&OPA132. Here is my question do you use 2 opamps pre pcb? Because the OPA2604 are dual opamps the ones that are in there now.

Regards

Dave
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Old 6th April 2006, 09:23 PM   #1607
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
Off the top of my head im not sure. I used 7805 for my servo reg pcb on my uber player and found the 1084/86 adj gave me better bass and a slightly better bass.

I also have some plastic caps to fit across the caps after the regs.

Brent
Hi Brent,

I'll look into the datasheets a bit more. Noise spec's aren't everything. Maybe output impedance or ripple rejection has something to do with it. But i've heard it before, that low-drop reg's sound better.
I'll keep it in mind .

Regards,

Ray.
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Old 6th April 2006, 09:29 PM   #1608
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by Gooch
Hi all

Hope this isn't a stupid question. I am getting ready to order the brownbog pcb's for single to dual using OPA627&OPA132. Here is my question do you use 2 opamps pre pcb? Because the OPA2604 are dual opamps the ones that are in there now.

Regards

Dave
Hi Dave,

There's no such thing as a stupid question, unless you know the answer already .

The two opamps in the player are dual opamps, with two identical opamps in one 8 pin housing. So actually there's four of them. Q605 is used for the left channel, and Q606 for the right. The first half of each chip (pins 1, 2 and 3) is used after the DAC, and the second half (pins 5, 6 and 7) is in the analog filter. With dual opamps you always end up with the same opamp in both places, and that's not optimal. But the adapter enables you to use two different single opamps in a dual socket on the PCB.

To use OPA627 after the DAC and OPA132 in the analog filter, is a nice combination. For each channel you need an OPA627 and an OPA132 (both SMD of course), and a BD adapter. Place the OPA627 in the position of IC1 (on top) of the adapter. Place the OPA132 in the position of IC2 (bottom) of the adapter, that's it. Look at the dot for the pin 1 mark, and make sure you place them the right way around. So each adapter indeed holds two different single opamps.

Regards,

Ray.
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Old 6th April 2006, 10:49 PM   #1609
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Hey thanks Ray

I am glad I didn't order the opamps yet I was looking at the opamp chart and it got me thinking so I thought I better make sure that there was two for each channel.
I will post my results when I get them clock card will be here next week also.
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Old 7th April 2006, 08:45 AM   #1610
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Yep, 2x dual = four singles! Ok, keep us updated with the results. Personally I like this combination very much. An external clock will bring a lot of improvement also.

Did you notice you have a smiley in your signature ?

Ray.
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