I was supposed to change the diodes from power supply but I found out they allready are schottky type diodes. I don't want to change them to worse diodes but I don't know any diodes that are better for sure 🙁
DIAR,
Your diagram is most helpful.
If the connections are exactly as you have stated, then it means that the two caps are in series and this combination protects both OPA's.
Besides connecting the 'B' pins of each cap together, did LCAudio provide a place to solder an extra wire to connect the junction of these caps to the chassis ground?
I cannot imagine why LCAudio did not use one cap of half the value (220pf) instead of two in series (2 x 470pf) if he did not intend to ground the junction of the caps using an external wire.
Thanks
Lewis
Your diagram is most helpful.
If the connections are exactly as you have stated, then it means that the two caps are in series and this combination protects both OPA's.
Besides connecting the 'B' pins of each cap together, did LCAudio provide a place to solder an extra wire to connect the junction of these caps to the chassis ground?
I cannot imagine why LCAudio did not use one cap of half the value (220pf) instead of two in series (2 x 470pf) if he did not intend to ground the junction of the caps using an external wire.
Thanks
Lewis
No, the caps were not connected to ground. That was the confusing part.
Maybe two caps work just better...
Maybe two caps work just better...
DIAR,
I agree, especially at radio frequency.
I am ready to order the extra parts I need to complete my project.
Thanks for all your assistance.
Lewis
I'm going to try OPA627 chips. They are single types and need a similar module as AD8065. Any ideas how to build such thing?
diar,
Consider using this adapter board.
http://cimarrontechnology.com/index.asp?PageAction=VIEWPROD&ProdID=9
Consider using this adapter board.
http://cimarrontechnology.com/index.asp?PageAction=VIEWPROD&ProdID=9
That's exactly what I need but I can't find a store nearer to Finland or atleast with reasonable postage fees. 
I ordered normal (DIP?) versions, not surface mount. I've been thinking about the module structure and I think I could be able to build a quite decent module atleast for testing. We shall see...
I received OPA267 chips.
I removed muting transistors the other day. Sound fabulous but makes those irritating POKS ! sounds when switching the power on or off.
After very quick listening test I am quite sure that a lot of harsness was removed and the sound became smoother. I previously thought that the harsness was in the recordings but apparently I was wrong. I also noticed much more details in recordings. Very quiet sound like stool squeaks, sounds from the singer mouth (opening lips or moving tongue try to open your mouth and move your tongua and you know what I mean) , piano pedals moving and so on. Diana Krall - Live in Paris - Case of you is quite a remarcable performance and a terrific recording for testing the system's accuracy and detail.
I'd say that the player sound more refined after removing muting transistors.
By the way, they were surface mount transistors and pain in the *** to remove.
I removed muting transistors the other day. Sound fabulous but makes those irritating POKS ! sounds when switching the power on or off.
After very quick listening test I am quite sure that a lot of harsness was removed and the sound became smoother. I previously thought that the harsness was in the recordings but apparently I was wrong. I also noticed much more details in recordings. Very quiet sound like stool squeaks, sounds from the singer mouth (opening lips or moving tongue try to open your mouth and move your tongua and you know what I mean) , piano pedals moving and so on. Diana Krall - Live in Paris - Case of you is quite a remarcable performance and a terrific recording for testing the system's accuracy and detail.
I'd say that the player sound more refined after removing muting transistors.
By the way, they were surface mount transistors and pain in the *** to remove.
OPA627 - Single to dual adaptor
Should I use capacitors between Vin+ and Vin- poles with OPA627 as LC Audio uses in AD8065 module?
I'm not sure if this adaptor is connected correctly but I think it is. There is room for caps in the middle.
It is possible to make it much smaller but in that case you must use double sided PCB or use one short jumper and cut off a few unused pins.
Should I use capacitors between Vin+ and Vin- poles with OPA627 as LC Audio uses in AD8065 module?
I'm not sure if this adaptor is connected correctly but I think it is. There is room for caps in the middle.
It is possible to make it much smaller but in that case you must use double sided PCB or use one short jumper and cut off a few unused pins.
Attachments
montreal said:
I ended up ordering a few of those adaptors you suggested. I made an adaptor myself and it turned out ok but it just wasn't "hifi" enough for me.
The costs weren't that high after all. The postage fee was only 6 dollars.
I got the adapters yesterday and mounted the OPA627 opas to it. After a quick listening I would say that AD8065 concentrates on playing techinally correct sound but OPA627 plays music. I haven't desided yet which one I prefer.
Techical sound is the dark side of hifi - Always so tempting but always the wrong choise. It is hard to make the right choise between two component by short critical listening. Unfortunately I often tend to concentrate on the ability to play certain sounds as I feel they should. It it easy to forget about the sound as a whole which actually tells about the ability to play music instead of correct individual sounds.
I have two outputs in the player and I will put AD8065 to one and OPA627 to the other and plug them both to my preamp. It is easy compare them by simply turning a knob. Eventually I can make the decixcion which one is the best. It is possible that there is no order of superiority and I keep on listening with them both 😀
I have two outputs in the player and I will put AD8065 to one and OPA627 to the other and plug them both to my preamp. It is easy compare them by simply turning a knob. Eventually I can make the decixcion which one is the best. It is possible that there is no order of superiority and I keep on listening with them both 😀
SMD capacitors - Are they worth replacing
LM317 regulator for DAC works fine now but I will continue experimenting with it as it seems to have a significant effect on sound. I installed temporary sockets for capacitors and regulator which allows me to make the changes quickly and without harming the PCB.
Picture of the analog output PCB including regulator for DAC [AD8065 (from LCAudio), OPA627 (on browndog adapter), Black Gate NX Hi-Q 47uF super-e-cap configuration, LM317 regulator (on diy adaptor)]
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/kokonaisuus.jpg
There are several caps after the regulator: 1000, 100, 0.47 and 0.01 uF (individual sets for 5.1 and 2 ch DAC). The first one (Elna Silmic 1000 uF) is right next to the regulator. The other ones are on a different PCB and are mounted close to DAC. 100 uF capacitor is SMD electrolytic. Should I concider changing it? There is always a risk of harming the pcb when removing SMD components (I do use two soldering irons).
The caps that I'm talking about are C629 and C635:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/piirilevyn konkat2.jpg
LM317 regulator for DAC works fine now but I will continue experimenting with it as it seems to have a significant effect on sound. I installed temporary sockets for capacitors and regulator which allows me to make the changes quickly and without harming the PCB.
Picture of the analog output PCB including regulator for DAC [AD8065 (from LCAudio), OPA627 (on browndog adapter), Black Gate NX Hi-Q 47uF super-e-cap configuration, LM317 regulator (on diy adaptor)]
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/kokonaisuus.jpg
There are several caps after the regulator: 1000, 100, 0.47 and 0.01 uF (individual sets for 5.1 and 2 ch DAC). The first one (Elna Silmic 1000 uF) is right next to the regulator. The other ones are on a different PCB and are mounted close to DAC. 100 uF capacitor is SMD electrolytic. Should I concider changing it? There is always a risk of harming the pcb when removing SMD components (I do use two soldering irons).
The caps that I'm talking about are C629 and C635:
http://kotiweb.kotiportti.fi/audiovideo/DIY/cdout/piirilevyn konkat2.jpg
Attachments
Re: SMD capacitors - Are they worth replacing
I have good success changing out the SMD caps in my panasonic XR45 digital amp. I replaced them with the same value of blackgate standards. The sound was more detailed and background got quieter. Have not had a problem with lifted trace with over 30 caps removed.
Mike
DIAR said:
I have good success changing out the SMD caps in my panasonic XR45 digital amp. I replaced them with the same value of blackgate standards. The sound was more detailed and background got quieter. Have not had a problem with lifted trace with over 30 caps removed.
Mike
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