Pars

Sorry about the snow guys... its currently -6° F here, light wind so not too bad. At least the sun is out

I immediately thought that M-80s might be fun...

Didn't read your welcome pm, did you?

I currently have my setting on "Show me all content I haven't read". When I do a View New Content, I get the same thread appearing more than once. I'm up to 2 pages now, but probably the same 12-15 threads in it...

Private Messaging: No Sent items folder?No message receipts?I know, bitch bitch...

Yep. Thanks Todd.

So by maximum value, you mean highest resistance? Should I replace the 20K resistors with 10K? For initial startup, should I reduce the resistance (pot) somewhat until I can monitor it (and increase)? Is the consensus for 1/2 populated output stage current to have a target of 75mA? 150mA? Or something in between?

I just used the Delete Cookies and logged back in. Same behavior as before.

Same since 8:00 am CST (first time I was on today). Advanced search doesn't help because it expects a keyword.

Yes, I agree, but I do not know where the 1W recommendation came from. It isn't noted in Kevin's hand-drawn schematic, and in Jacob's (j4cbo) first pass BOM spreadsheet, they are shown as RN55s or 1/4W PRPs.

Thanks, but if you read the thread completely, the ADA4898 will be used for buffering / SE->balanced conversion only. I/V will be done with a discrete stage designed by Colin Toole (cetoole here). Regarding the input filter: yes, I just noticed that when I posted this thread... not sure why I didn't see it (and remove it) when I replaced the NE5534s with THS4031s (with much bypassing).

R31-R34 don't look like they are set up for any power running thru them:

Actually there is quite a bit of room in there, though looking at them I'm not sure how you are supposed to mount them. I think I'll remain a wimp, though ya never know... BTW, is an I/V resistor the only other thing you need with these, or do you have to AC couple them as well?

Yeah, that gives a lot more insight into things, and makes my snarky post sound, well... snarky. So if the Appeal is ruled in favor of the plaintiff, what will the effect on Russ' business be? Is it a monetary judgment, cease and desist on the product in question?

I don't think you want to do a ground rod, but I'll let Kevin or someone with more experience weigh in on that. +1 on running new wiring, and probably plan for 20A circuits.

That one is nice and clean Colin. Fun toy

Ooops, guess I misunderstood you. The transformers are intended for I/V use? I assumed they were just for SE->bal conversion. I don't think I even want to try transformer I/V.

Mouser it is! Looking at the schematic for these (R31-R34), it appears that the CCS's are setup for ~4.5mA, so that is all that is running thru these (assuming I calculated this correctly... 1.6V LED - Vbe ~ 1V / 220 ohms). Footprint is identical to the other leaded/SMD resistor combos, so I am using 1/4W PRPs here.

Marc, I might take you up on that (transformers), for a listen. In order to get a sense of how much these would be should I like them so much I felt the need to buy some, what are they? Sowter? Filburt suggested replacing the ad8599s with ada4898-2s also.

2SA1145 / 2SC2705? Where to buy? I just looked thru my stash and don't have enough of these to do a pair of boards. Any suggestions on where to buy these? I assume Y grade is what I want (not O)? B&D has a few (only 6 SCs), and high price. Mouser has O grade for really cheap. Any other sellers? Anyone on ebay that can be trusted?

Just found a setting related to View New Content since last visit or View New Content Unread... think that did it.

Happy Birthday Grahame!

WTG Todd and all! One minor nit... I assume the View New Content in the upper right is the equivalent of view new posts in the previous iteration. When I hit it again after reading a topic (last post), it again shows that topic, but with no new content. Apparently not marking it as read.

Marc, From a previous post, this is the current recommendation? The series resistor is R62. This is not shown in the Eagle files I have from Jacob, which must have been a bit prior. My eagle files also have TO-220 vregs for the servo, etc. on it, which are not used if you are using the OPA445s for the servo opamp. The board itself has positions (unmarked) for TO-92 regs (7815/7915?) on it. I am going to jumper these and go with the OPA445. I am making updates to the BOM as I go. Also, I was missing the 620/680R, was short on 5K and 30K resistors, so when I did my Partsconnexion order, I used Dralorics here (626R, 5.05K and 30K), which are 0.25% or better resistors. Saved me from making a Mouser order, though that will still happen EDIT: anyone have the final Eagle files? EDIT2: For the 10R resistors, could we use 1/4 or 1/2W PRPs? Or do these need to be 1W? (Reason: I have some 1/2W PRPs)