Thanx a lot! I find ur info very good and u have actually convinced me to build a battery-pack of 16 AAA's (800maH each) and some kind of a charger using 317...so we will see how it works /Peder

Thanks a lot, especially Syzygies! This really led me to give the nimh 9v another chance, it do seems to be the smartest solution. Btw, do u know if 9v nimh:s also has a lower impedance than alkalines? (I know AA and AAA has that advantage) And...the charger circuit ur talking about...

"Give the OPA2107 a shot. A lot of people say it sounds like the OPA627. Should give you a lot better battery life. Really though just get them all and listen for yourself". Thanks for ur tip! But I've already tested them and in my opinion they are not in the same league as 627/637 ..sadly...

Ok, so I've decided to build this: 3 channel portable amp and I just love opa627 so I would love to use them and a single Buf634T as a buffer on each channel , in a multiloop circuit. That's the facts, here is the q: 1. Since it's portable and I would like the lowest power consumtion..would...

Thanx a lot guy's! At least a start in my search for what will be the best sounding opamp for me...right now I'm leaning towards 627/637...so far the best sounding amps but also (sadly) the highest power consumtion.. well..good sound IS important! /Peder

Yes! Please state which opamp u prefer in a portable amp, why u like it and what kind of music u usually listen to with that opamp. Actually...all parts of the chain should be here, but I'm just tryin to get a picture of ur preferences... Thanx! /Peder

Yes, my thoughts on this were just that...the multiloop gives the opamp a more stable environment and therefore less prone to oscillate without that capacitor, now it's confirmed! Now it's just up to me to decide if opa627's are a good idea in a portable amp...will they drain my batteries to...

I´m about to build my second portable headphone amp here. It will be using 3 channels (L/R + Ground) in a multiloop configuration. The opa's used will be AD8610 or Opa627 or Opa228 or Opa227 depending on offsets and total powerconsumtion (only batteries used here 2x9v) and of course it's...

Hi I can highly recommend this : Multicore X32-10i flux...it's great! Easy to clean and give u nice shiny solderings! /PJ

Don´t know if I'm seeing clear but it seems to be a short between legs 2,3 on the op, is that right? and some other things I think...

Hi! Just had a thought...read somewhere that the way to make digital volume controls is by lowering the number of bits..(Yeah that was a very simple explanation...) SO I just thought this; Is it perhaps best to have most of our portable units volume on "max" and instead regulate the volume...

Nevermind now, I've got the answer from a nice guy at -Computers as source- So now I know... /Qpedejo

It's using the CS4341 Why I'm about to change is because Wolfson got so good reviews all over, so I'm curious... /Qpedejo

Hi, well after repairing and modding a lot of guitars and basses I've come to this conclusion: 1. If ur able to do it, use STARGROUND! That does not only lowers the total noise of ur guitar, it also makes it safer... 2. Using expensive "hifigrade" pots and resistors never makes any...

Hi! I've built a portable amp with a OPA2228+2xBuf634 in a noninverting no multiloop configuration and I'm getting +/-7mV in output offset. That is with a shorted input. When I used a AD8620 as input-amp there were no offset in the same situation...is that possibly because of different...

Thnx a lot Dan T, FINALLY I can get a long and mod my already bought Gainward card and see how it works... I'm a happy Swede here.... So have a nice day then.... /qpedejo

Thnx Glassman! So I guess ur talking about that flasher EEPRWA / EEPRW? Then there's just the resistor values I'm missing ...soon ready to go! /Qpedejo

Hi! Is here anyone with a chaintech AV710 card who would look at it and.. Tell me what values R72,r73,r74,r75,r76 - resistors have? They are placed around the wolfson 8728 dac. That would really help me a lot since I'm about to change the Cirrus dac to a wolfson on my Gainward card. (No...

Come on now people! Thought this was a forum for modifications, and that's exactly what I'm about to do. Just want those values for comparision in my application. So plz help me here, and if u don´t know what that numbers stands for- just write them down...cause I know what they mean...

Dear Glassman, my situation is like this.... 1, I do already have the wolfsson dac. 2, It does look like a general opinion from people here that the wolfsson dac sounds better than the cirrus...Do u have an opinion about these two dac's? 3, U wouldn't happen to know where to get that...

Next answer please... Since that isn't the situation here..there are places for aternative dac's on these cards... /Peder

Hi, I was thinking about changing dac (That one driving channel 7/8 ) on a Gainward Hollywood@home7.1 card. Since Chaintech's AV710 is no where to find here in Sweden I was thinking; hey, how about changing the dac to that wolfson model? (Yes that's the only differences between these 2...

Thnx Morsel and amb! Nice to see that u know what ur talking about.... And, I ´ve to discovered ur findings about multiloop when simulating these circuits, but it's always nice to have it confirmed from the source.. Keep up the good work! /qpedejo

Hi! Even though it feels like I´m somewhat banned here...I would like an answer anyway... Wy don´t u use multiloop in this configuration? Is because the use of AD8610 with it's nice buildup u don't feel it's important? (hope I haven't miss a explanation to this in the earlier posts) And I...

Hi! I´m sorry to say that I must ask another q about buffers, hope u don´t mind Well...I have this dilemma, having the same amount of HA5033 and Buf634T. Which would u choose? Shall I go for "best sound" (HA5033) or will it be even better sound with Buf634 since it can produce more than...