Pars

For (quite) awhile, it seemed like everytime I dropped into the AA DIY forum, I thought I had entered an Oyaide forum by mistake. Discussions of which outlet faceplate (or none) sounded better, yada yada... I've never heard that before? Interesting. Any references?

Happy Birthday Colin!

I was under the impression that non-DIYers could still get an amp built, as that was one of the stated goals on the first page? I had assumed that whoever is building the boards would test them, etc. and these woud be provided ready to go. I also assumed that a full case and all other parts would be available, including FPE panels, etc. so that the DIYer could construct the amp without having to deal with all of the chassis work, etc.? Basically put the amp together with a minimum of wiring to do?

CD-Player-DAC-Transport List

According to the DA and Transport List, this used: SONIC FRONTIERS SFD-2 2 x UltraAnalog D20400A – SM5803AP Had it been a MkII, it would have had the PMD100 instead of the SM5803AP. Same parts as a Mark Levinson No. 30, PS Audio Ultralink. Of course the supporting circuitry, output stage, etc. is probably completely different, so just cuz it has the same chips in it may not mean much.

Ooops, yeah I hadn't considered that aspect.

Yes

No USB should make no difference. Coax, yes. Should be at least 1.5m to minimize the effect of reflections. Some subscribe to that theory. Others go opposite (short ICs, long speaker cables (I think Mapleshade might advocate this,but I don't get their catalogs anymore).

Per subject, I see that Soniccraft has a 20% off everything sale going on. It doesn't list dates, so I assume for February? Sonic Craft Specials

I think we need a level of interest check among the various peeps here, per vvs' post. It seems there is a wide range of expectations as to what this is and what it will include, running the gamut from j4cbo' post on the 13th to I guess my expectation (basically a pair of boards, stuffed optional). I can certainly understand and support the concept of a group build to allow different types and levels of involvement, differentiating this from a simple group buy for some PCBs as the previous Dynahi/Dynalo, etc. activities have been. I also sense that I am probably in the minority in terms of expectation?

Happy Birthday!

A couple of Brother laser printers in here, as well as flash drives, etc.: Find a Best Buy on Weekly Deals & Sale Items - Buy.com

Someone said Tango IIRC

...

From what I have seen in deemphasis is normally handled in the output stage. This is from the stock output stage of a Rotel 855. The FET (T401?) either turns on or off according to the DEEM signal, and shorts out the 5.6M resistor feeding the upper portion of the feedback loop (the bottom portion of 1.5k resistor and 2.4nf cap would be normal 1st order filter stuff for a TDA1541a). I've never looked at the DEEM signal to determine whether the FET is on or off normally, but I would assume it turns on if the preemphasis flag is set. All discrete stages I have seen ignore deemphasis. Mine uses a simple 1st order filter (1.5k resistor, 1.2nf cap). I've wondered whether I needed to do anything more, but believed that CDs using this were quite rare?

What Dusty sez! Happy Birthday!

Wishing you a speedy recovery!

Another thing that I am definitely going to use in mine is an e12 board... actually the modified one I did up awhile ago and use in my Dynalo. This one uses a 555 timer, but more importantly has a manual mute switch; nice for changing headphones without worries LED drivers/outputs for normal and mute/fault states option to tie fault test ground (pin 2 of the opamp) to the amp ground Most of you seem to be planning on doing balanced DynaFETs; the ability to deal with 4 channels (or more?) must be addressed if any are interested in this. Since this is Amb's design, even though more or less open source, it should be run past him to see if he objects. I suppose pairs of standard e12s would work for the most part also.

There's always Dantimax... Dantimax (elektronik) - Kits I should stay out of these discussions as I plan on my SE set to interchange with a Dynahi under construction, I already have case, pot, etc. and plan a very simple rear panel as this will only be a headamp.

The D5 in the part number means a DIN-5 connector, which is what the TTVJ pic and your Elpac pic use. Interesting that clicking on the datasheet link goest to iccus corp. who it appears bought elpac. Looking at the commercial lineup, I don't see the WM071 listed anymore, though it is in the WM.pdf datasheet still, but that is an Elpac datasheet. Doesn't bode well for commercial gear using this PSU unless it is an oversight.

Elpac only makes one linear +/-15Vdc wallwart IIRC: WM071-1950-D5 Now I suppose that TTVJ could have had Elpac do a custom version, but I would doubt it.

That is a pretty ugly casing job. The power connector is marked +/-15V, so I would think a DPS should work. If it is using the same Elpac (WM071 something) then the pinout would be the same. If you try it, I would check output DC offset before I plugged anything into it.

I would think that digikey or mouser should have it. Allied also has it, and has a 250' roll of Olympic clear jacketed on clearance: http://www.alliedelec.com/Search/SearchResults.aspx?Ntt=lamp+cord&N=4294965379&sid=11F6A430333A&Ntk=Primary 4th or 5th item down IIRC for $67

I've looked this over a bit more and here are the comments I have. In general my viewpoint is geared towards making the board more tolerant of any rework required down the road, hence comments regarding pad and trace sizings (bigger usually is more tolerant of desoldering, etc.) Trace width seems rather small on a lot of the circuits. Pad size also is small for the thru hole components, particularly on the larger resistors (2 ohm I assume?) up by the output FETs. But really, on all components. Trimpot pads are minuscule (and I realize those are the stock library sizing). I see you have vregs in place to allow for +/- 15V opamp operation (ala Dynahi). Hopefully, this circuit does not require higher voltage swing on the servo (hence the original opa445)? Overall, very nice job!

Damn, I must of missed that I may have to get one cuz I wasn't looking forward to dealing with steel for an IEC, etc. cutout.