chiguy

Avel Lindberg quotes me as follows. Any thoughts? This request for an extremely high end Audio Transformer and as “mechanically silent”, heavier wire gauges”, Static Shield”, Magnetic Shield” are standard requests that will always improve a transformers operational quality. However the offered dimensions of 100mm Dia x 50mm Ht are restrictive to the design relating to performance. In addition the rating of this transformer is nearer 135VA than the 120VA stated in the request which also affects the design parameters. The is the best 135VA possible that we can offer within the 100mm Dia x 50mm Ht dimensions given. Description Toroidal Transformer. Primary 117v + 117v 50/60Hz Secondary 1 280v @ 0.18A rms. Secondary 2 280v @ 0.18A rms. Secondary 3 15v-0-15v @ 0.5A rms. Secondary 4 6.3v @ 1.5A rms. Secondary 5 6.3v @ 1.5A rms. Total Rating 135va approx. Int. Shielding Pri-Sec Static Shield. Ext. Shielding External GOSS “Magnetic” Band Fitted Mounting Dish Mounting kit supplied. Finish Polyester Tape Leadouts 300mm Flexible Style. Size 100mm O.D x 50mm Ht approx. Weight 1.54Kg approx. HIPOT 4000VDC PRI-SEC $209.75

PCBs received. Thanks for an awesome group buy! So I have been requesting quotes from different vendors for transformers using the specs posted earlier in this thread. I'm still waiting on a few vendors but so far SumR wants $94 and Toroidy quoted: Audio grade transformers with mounting pads: TS 150VA PRI: 2x 117V SEC: > 2x 280V @0.18A > 15 - 0 - 15V @0.5A > 2x [email protected] cost: 75,80 EUR/pc Audio Supreme version: TS 150VA PRI: 2x 117V SEC: > 2x 280V @0.18A > 15 - 0 - 15V @0.5A > 2x [email protected] cost: 112,70 EUR/pc In audio grade, noiseless transformer price You'll get transformer wound on high inductive, selected and measured core. Core and all the windings will be impregnated. Transformer will also has electric and electromagnetic shields, epoxy filled interior and mounting pads in price. Audio SUPREME version is fully epoxy resinged in stainless steel box: http://www.toroidy.pl/s783/57ad94c01a056094fc22ba3ecded9a40.jpg Will using 150VA as quoted be okay or should I stick to 120VA? Also, is the Audio SUPREME version worth it?

So I didn't notice there were two types of 0.1uF caps on the amp PCB. I meant to ask about the 0.1uF capacitors by the servo. The BOM says 50V will be sufficient. Is this still true?

Thanks guys! Another dumb question; is there any need to match transistors for this build?

Some dumb questions here: What voltage rating should the 1uF and 0.1uF capacitors be? (On the right side of the amp board.) I didn't see them marked on the silkscreen. For the LSK389, do I want the A, B, C, or D? (2nd page on http://www.linearsystems.com/assets/media/file/datasheets/LSK389.pdf ) Also, does anyone have part numbers for the amp and PSU heat sinks (both the large and small ones)?

The silk screening on the boards say 36VCT so anywhere in between 30VCT and 36VCT is okay? Is there any point going higher than 30?

I've only ordered once from SumR but there was no mounting hardware provided. It was a fully encapsulated unit so there was a foam pad glued to the bottom and a nut shaped hole for a nut on top. I ended up buying a M6 bolt, nut, washer, and locking washer from a local hardware store. Would any of these work for you: http://www.alphacoredirect.com/contents/en-us/d51.html

In my experience, Dell replaces with refurbished units. Granted this was several years ago so I don't know what they do now but I wouldn't be surprised if it was a refurb replacement.

I just read Wikipedia's page on Thunderbolt which includes the power specs. The interface is only capable of 18V of bus power at a max current of 550 mA for a total of 10 W maximum. For comparison, the Apple power bricks are rated at 85 W. http://en.wikipedia.org/wiki/Thunderbolt_(interface)

The Apple Thunderbolt Displays have a combo TB/MagSafe cable that's used to connect the display and charge the Macbook. I haven't seen a TB dock that has this yet. As far as I know, Macbooks cannot be charged via the TB ports. https://www.apple.com/displays/images/overview_hero4.jpg

I've used Winclone for that and it works well.

Not the best remote management option but one of the simplest I've used. http://www.teamviewer.com/en/index.aspx

I've been using the FoodSaver handheld vacuum sealer and the gallon sized zipper bags with pretty decent results. http://www.foodsaver.com/vacuum-sealers/FSFRSH0051-P00.html#start=29&sz=12

If you don't mind me asking, what are the specs on the transformers that you're using for the Megatron?

I'd be interested in the quote. Thanks!

So i just got done cleaning one board. I used a shallow tray that was large enough for the board and soaked it in alcohol for a bit. It works pretty well.

I was thinking about soaking the entire board in alcohol but I haven't found the time to work on it yet.

With the KGSSHV PSU able to be built for 500V output, is there any point or advantage in running the Megatron at 500V (assuming that it's capable)? Any downsides?

I picked up my boards today from the post office. Thanks!

I would like a few things from Satodenki if that'd be okay. I'll send a PM with a list soon.

I'm still waiting for my boards too. I'm in midwest USA.

I can use some PEEK screws.

I'm guessing a shielded transformer is out of the question due to its increased size?

Did the post office raise their prices again? Anywho, I just sent you the difference on PayPal. Thanks again for doing all of this.

Should we cover the board with Kapton tape before populating it?