UFN
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Posts posted by UFN
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Would you not mount the amplifier PCB with the transistors at the bottom of the heatsink? In that case, the balance pot is at the top and the standard straight pot should be OK to adjust even after the board is mounted?
//UFN
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Agree. Hum could occur because of a poorly designed transformer, an undersized transformer, interference (due to suboptimal wiring), grounding issues etc. Just moving the transformer to a separate enclosure isn't guaranteed to fix the issue.
//UFN
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As I recall, the recommended transformer for a non-balanced original Dynahi was 2x30V/80VA+. Each board draws around 300mA, so 80VA would be roughly twice the current draw of two channels.
//UFN
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Very interesting...
//UFN
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I guess that beats having to worry about VAT
Yes, by a very long way...
//UFN
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Thanks for the answer. I ordered from Mouser a few years ago but I do not remember the conditions so your info is useful.. Rs is expensive I agree. That +30 comes from the VAT+duty. in my place. The costs depend on that too how many places you can get the parts from. This depends on the BOM and the question maybe for the building thread.
No problems. Note that the duty is supposed to be included in the EU-prices (euro or other local currency) so you only pay VAT on top (25% for me) - unless you're VAT registered of course. The VAT amount is just added to the amount deducted from your credit card at check out (although it's not visible until just before you confirm the order).
I live in Sweden. If I make an order not later than evening 8 a 'clock Swedish local time with Mouser - I have a nice guy knocking at my door at 10.30 am day two. Less than 48 hours from the US.
I can order much later in the evening than that, but my orders are mostly small and probably don't take long to pick and pack
//UFN
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Not sure exactly where you are located, but I more or less buy everything from Mouser now. Massive selection of parts and very simple ordering. I do get charged local VAT on top of their prices, but it's done immediately and there's no fiddling with customs, additional fees or delayed bills etc. afterwards.
Shipping is free for orders above 65 EUR. It's via FedEx which wouldn't be my first choice, but it works well and it's a fairly consistent two-day delivery (so order on Tuesday night EU-time and delivered during Thursday or Friday at the latest).
I do still use Reichelt and TME sometimes, but it is getting less and less frequent. If you are in a country where RS/Farnell is an option that could work as well, but IME prices are much higher.
//UFN
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Email sent.
//UFN
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I always tap by hand. Having had to fix a couple of broken taps (and discard a couple of heatsinks that couldn't be fixed) I've decided once and for all that those extra minutes to do it by hand is a good investment...
//UFN
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Will you send out requests for the shipping costs?
I think a separate Carbon build thread is a good idea.
//UFN
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Absolutely gorgeous!
//UFN
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Great. Hope my boards are among the ones that are ready to go
//UFN
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Nice idea, I may want to copy that
//UFN
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Saw them as well - and immediately started dreaming up around 57 potential ways to violate Schist's advice of "Do not use these in other products"
//UFN
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No objections your honor
//UFN
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Happy with mine as well.
//UFN
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Looks really good to me
//UFN
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My guess would be that it is due to the volumes they order from the supplier, but I am not sure. I have also seen some cases where the 50ppm RN60s cost less than the 100ppm ones of the same value so there are some inconsistencies here and there
//UFN
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While I do like Mundorf's film capacitors (no experience with their electrolytic caps), my vote is to let builders have more freedom to use capacitors of their choices and not be limited to a single choice.
Fully agree!
//UFN
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Isn't that just showing the difference between the "civilian" and the "mil-spec" ratings?
//UFN
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I have put in a column for participating in the "Acknowledgement" and as mwl168 stated people are free to participate in the GB anyways, I have taken the liberty to put "Yes" in that column, so you need to change it if you for some reason cannot participate.
+1 on this
//UFN
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Updated my entry on the spreadsheet, thanks a lot to MWL and soren for doing this
//UFN
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2 pairs of amp boards and two dual supply boards.
Possibly another pair of amp boards and a pair of the single supplies depending on price/availability.
//UFN
Closed - KGSSHV Carbon and GoldenReference HV PS Group Buy
in Do It Yourself
Posted
Finally got my boards as well (inexplicably long customs delay...). Much appreciate the effort from mwl and anyone else that made this GB happen
//UFN