sbelyo

I'm going to use the opa445 so I can omit the 7815 and 7915 regulators correct? If so, do I have to jumper the holes for the regulators or can I just leave them unpopulated?

That's pretty much what I thought... I'm gonna stick with the Panasonics. I think I used FM's in my original Dynahi. I thought the FC's had lower ESR and higher reliability. I'll have to read the datasheets again

I'm building a pair of the rev2 dynahi boards and a pair of Sigma22's and I wanted everyone's opinion on weather or not boutique capacitors make a difference in those boards. Since there's no electrolytics in the signal path (correct me if I'm wrong) I'm not so sure they would make a difference. And I think I remember somewhere that the boutique capacitors often have a negative effect when placed in those positions. My other option would be just to use Panasonic FC's

Perfect... Since I'm planning on using Grado's along with high impedance cans will I need to adjust the gain?

I've decided to use two sigma22's for the psu. One for each channel. How much DC current will one channel draw? I'm guessing it's based on what the load of the amp is so I'll be using it with 32 to 300 Ohm headphones

yep, they look to be almost the same size. max on the dales is 0.425 in length PRP is 0.400

will the 1/2 watt PRP's fit the board? I don't have mine yet so I can't measure

found: 8 2SK170 8 2SJ74 2 2SK389 All BL grade I was planning on using vishay-dale resistors except for the resistors on the output transstors. Would it be worth it to replace those with PRP? I contacted them and they will sell me 64 20R 1/4 watt 50ppm 1% at about $1.25 a piece lead time 6 weeks. Couldn't find 20R at Partsconnexion or soniccraft. I could also get IRC 20 ohms from mouser at around the same price and they are in stock. What do you all think?

I have to check what I have.... oy

ah, ok that makes sense. As far as the LSK389 you're right, the pakage is the same I just don't know what grade to use. Another question, the people out there with completed board are just using the 2SK170's and the 2SJ74's (matched pairs) ? If that's the case it's the only way to complete a board right now correct?

am I missing something or is the LSJ109 a single in a TO-92 package ? The board has it layed out for a TO-71. Was it available as a matched pair or something? Need some help on this part. Also, I can find the LSK389 in a TO-71 package, but what grade or letter do I use A B or C?

Wow... Thanks for trying that. It's good to know that it doesn't blow up. Alas, I think I'll just build it with a case and PSU that will support headphones for now, but it's nice to know I could power speakers with it

Thanks Pars.... I'd have to take the case off my original Dynahi to see what I used

It was just a thought. I was going to build something else for the speakers, but I thought it was worth an ask. I won't try to drive speaker with it then. So you think I would need a total of 4 sigma22's? One amp board is 2 channels right? Or did I misunderstand? I was thinking one sigma22 per board ie one for Left and one for Right. I'm guessing 30VAC output on the transformer. How many voltamps?

I was able to get a set of bords for the Dynahi rev2 from Tran. Hopefully I'll get them in the next two weeks. Until then I have a few questions before I start to buy parts. Would a pair of Sigma22's work for the power supply instead of the PSU borads that come with the set? Could I drive a pair of 8 ohm monitors with this amp as well as headphones? If so how much power will it provide? What are the reccomended specs for a power transformer if I'm going to drive speakers as well as headphones?

I tried joining the forum but the email never came to my address. I'll have to send a note to Ti. I did take a look on his forums and did see one that I remember. I guess I'll have to start one. Now that I have everything to construct my buffalo DAC and all my cans are wired balanced I have no choice to go balanced with an amp. I missed out on the new Dynahi run and I just don't think I have it in me to do a group buy.

I'v decided to build a balaced M3 and I would like to see how others may have implmemented swithchable gain and different component choices. Thanks

Thanks Guys

I would like to build my new balanced rig properly. Should a source have male or female XLR terminals, and again what should the amp have?

hah... hopefully I can "nail" a set

Yep, I got the files. thanks I've never done a group buy though. I'm working on tracing down a set so we'll see what happens

I have single ended one built from those boards. I want the new set

I tried searching for them. Any idea where they are posted?

will there be another run of the dynahi and psu boards? im in the market for a bablanced set

another +1 on this amp.... It's really good for the money and very easy to put together. The steps are layed out and explained very well. So well in fact that I lett my 11 yo son solder a few joints and this has now peaked his interest in the DIY arts. It sounds really good with my 250 ohm darth beyers. The sound quality was the same as some amp designs that I've thrown hundreds of dollars of caps at let alone the full cost of building them. I cant wait to try the speedball upgrade