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Old 6th December 2011, 06:20 PM   #121
Mayday is offline Mayday  Sweden
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Originally Posted by tubee View Post
LM4562 is allrigt

For IV i prefer THS 4032 though
In my headphone amp it's more detailed then the NE5532, still a bit hard but it hasn't had time to burn in yet.

IV?
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Old 6th December 2011, 06:43 PM   #122
tubee is offline tubee  Netherlands
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Current-> voltage converter

The NE5532 opamp does that job in the cdp. (first stage at least)
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Old 6th December 2011, 09:51 PM   #123
josha is offline josha  United Kingdom
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There's an interesting article about using the 317/337's here it's worth clicking back through to parts 1, 2 & 3 to understand the final result. I must say that I haven't tried these yet but will be doing so.

I do recommend using a good size heatsink for whatever regulator you decide for the 7220, I ran with a single TO heatsink and it shut itself down a few times before I realised what was happening (this may have led to the untimely demise of my filter!). If you have a large heatsink available in the player then you could tie the regulator to that but isolate it as the LM317 case is vOUT! In my case there was a 7805 or similar attached to that heatsink and I essentially grounded the 317 (that may also have contributed!).

I tried NE5534, OPA227, OPA134 as well as the original LM833 and in the end, to be honest, I couldn't tell a big difference, if pushed I'd say the 134 was a little harsh but who knows, it could be the implementation and the fact the OPA's are single. They were all configured as i/v with the same value resistor and cap and all went straight to the RCA's via another cap to block the dc (no additional gain).

I did find that the physical implementation of the opamps made a big difference, even soldered straight onto a board (rather than via a socket) gave a noticeable improvement in my case, especially with the newer, faster opamps. You could take a feed straight from the DAC, build a dedicated board per variety of opamp then swap them quickly. You can then add a different stage altogether later without too much trouble.
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Old 6th December 2011, 10:38 PM   #124
Mayday is offline Mayday  Sweden
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Originally Posted by josha View Post
There's an interesting article about using the 317/337's here it's worth clicking back through to parts 1, 2 & 3 to understand the final result. I must say that I haven't tried these yet but will be doing so.

I do recommend using a good size heatsink for whatever regulator you decide for the 7220, I ran with a single TO heatsink and it shut itself down a few times before I realised what was happening (this may have led to the untimely demise of my filter!). If you have a large heatsink available in the player then you could tie the regulator to that but isolate it as the LM317 case is vOUT! In my case there was a 7805 or similar attached to that heatsink and I essentially grounded the 317 (that may also have contributed!).



I tried NE5534, OPA227, OPA134 as well as the original LM833 and in the end, to be honest, I couldn't tell a big difference, if pushed I'd say the 134 was a little harsh but who knows, it could be the implementation and the fact the OPA's are single. They were all configured as i/v with the same value resistor and cap and all went straight to the RCA's via another cap to block the dc (no additional gain).

I did find that the physical implementation of the opamps made a big difference, even soldered straight onto a board (rather than via a socket) gave a noticeable improvement in my case, especially with the newer, faster opamps. You could take a feed straight from the DAC, build a dedicated board per variety of opamp then swap them quickly. You can then add a different stage altogether later without too much trouble.
I'll read that article tomorrow(save it to my pc for future reference).
Reading up as much as I can, so thanks!

I'll wait until I can order the LM4562's then. Will take the signal directly from opamps, via 4,7uF/400V MKP, to outputs. You're supposed to take the signal from the first two opamps(lifting a capacitor and bypassing the rest w the MKP?) right?

I shouldn't write more today, tired and the the lights are on but nobody's home "upstairs" so to speak
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Last edited by Mayday; 6th December 2011 at 10:42 PM.
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Old 7th December 2011, 08:32 AM   #125
UV101 is offline UV101  England
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Mayday, look at the last page of that clocking doc. It shows a single opamp as I/V. Using an LM4562, LME47920 or LME 47860 will produce enough drive into most amps. I use 2n2 in parallel with 1k78 as the filter and a decent 4.7th output cap. Did this in a pals CD65se last night with excellent results.

One thing I did notice that I should have pointed out previously is that you may start to run into issues with output muting with very large caps :-) The easiest answer is to turn the CD on 1st and off last ;-)
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Old 7th December 2011, 09:21 AM   #126
Mayday is offline Mayday  Sweden
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Originally Posted by UV101 View Post
Mayday, look at the last page of that clocking doc. It shows a single opamp as I/V. Using an LM4562, LME47920 or LME 47860 will produce enough drive into most amps. I use 2n2 in parallel with 1k78 as the filter and a decent 4.7th output cap. Did this in a pals CD65se last night with excellent results.

One thing I did notice that I should have pointed out previously is that you may start to run into issues with output muting with very large caps :-) The easiest answer is to turn the CD on 1st and off last ;-)
Will read it again, alot of info now...trying to learn eagle to

By filter you mean between pos and gnd on the rca's right(zobel?)?

I allways switch the stereo on and off in a certain order, so that shouldn't be a problem.

I've put together a list of mods, and order to do them(not complete yet). Will take them time to listen between mods:
1. Fix the cd-clamp DONE
2. Decouple TDA1541 DONE
3. Put in the 22000uF TSU DONE
4. Put 2000uf low esr in parallell w each of the 3 other caps before regs
5. Replace the caps after regs w 470uF ZLH
6. Put 470uF ZLH around opamps
7. Put the other ones UV101 recommended by the digital circuits
8. Bypass everything after first opamps to rca via 4,7uF MKP
9. Remove the pcb for variable out(is it just to disconnect all connectors and jank out?).
10. Dedicated PS to SAA7220

That's what I've gotten so far, after that there's clock, more dedicated PS etc
The fun never ends
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Old 7th December 2011, 09:52 AM   #127
UV101 is offline UV101  England
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The filter form part of the feedback loop. Its not Zobel.

Click the image to open in full size.
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Old 7th December 2011, 10:15 AM   #128
Mayday is offline Mayday  Sweden
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The filter form part of the feedback loop. Its not Zobel.

Click the image to open in full size.
Ahh, I see.
It's a filter between two pins on the opamps. Between input and output pins.
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Old 7th December 2011, 12:13 PM   #129
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Yes between output and non inverting ( - ) input
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Old 7th December 2011, 01:04 PM   #130
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Yes between output and non inverting ( - ) input
In the case of LM4562:

Between pin1 and pin3 or pin5 and pin7, or both?

Looking at datasheet for LM4562.

Or am I missing the hole thing?

Anyway, I've got the time to get it right, haven't gotten my MKP's yet.

Trying not to rush
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