July 25, 201313 yr comment_590717 About 3 weeks to arrival in UK from Poland, obviously probably longer to your destinationCheers Report
July 25, 201313 yr comment_590718 I've just looked up his audio grade description: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.Shipping cost to UK - 19,00 EUR/package up to 30kg. (1pc 100VA's = 1,4kg)Payment via bank transfer or PayPal.Production and delivery in ~18-24 days . Report
July 28, 201313 yr comment_591190 Just finishing up my amp boards. I wanted to confirm that these two locations are to be left empty? Report
July 28, 201313 yr comment_591193 Those are links connecting tracks on the other side of the board.Yes, leave them alone. Report
July 28, 201313 yr comment_591248 First KGSSHVk up and running... This is a 450V version and sound bloody good... Report
July 28, 201313 yr comment_591271 That's nice, looks smaller - to save me working it out what size case is that again? Edited July 28, 201313 yr by headinclouds Report
July 29, 201313 yr comment_591382 Just curious, has anyone put together a BOM for the KGSSHV mini PSU? I've been looking at semiconductors so far. I've been looking at this BOM and am noticing different semiconductors compared to the latest version of the mini psu, https://docs.google.com/spreadsheet/ccc?key=0AnqARwsQ1QV7dG44Z2lZUnAwN3B0VE1Ub2xhLXN2U2c&hl=en_US#gid=0 What I have so far for semiconductors. I'm not sure if all of these are suitable however. 4x 2N3904 http://www.mouser.com/ProductDetail/Central-Semiconductor/2N3904/?qs=sGAEpiMZZMshyDBzk1%2fWiw99kSkYzPxmf7NzGOknJzA%3d 4x FQPF8N80C http://www.mouser.com/Search/ProductDetail.aspx?R=FQPF8N80Cvirtualkey51210000virtualkey512-FQPF8N80C 3x IXCP10M90S http://www.mouser.com/Search/ProductDetail.aspx?R=IXCP10M90Svirtualkey65120000virtualkey747-IXCP10M90S 6x 2sa1486 4x KSC5026M http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/KSC5026MOS/?qs=%2fha2pyFadugoJzb5kdHGb1mz%252bVf84Up2OEtCwNu0mTI%3d 2x LT1021-10 http://www.digikey.com/product-detail/en/LT1021DCN8-10%23PBF/LT1021DCN8-10%23PBF-ND/891397 8x STTH512FB http://www.mouser.com/Search/ProductDetail.aspx?qs=8M15sSGRUn9rlB8mv3qAqw%3d%3d 1x 7815 http://www.mouser.com/Search/ProductDetail.aspx?qs=VOMQJJE%252bBNmeOJuT6KI25w%3d%3d 1x 7915 http://www.mouser.com/Search/ProductDetail.aspx?qs=%252b9%2fcbd0IE0T0iTVdYUTt3Q%3d%3d Report
July 29, 201313 yr comment_591384 First KGSSHVk up and running... Is it me or Spritzer just said a bad word? Report
July 29, 201313 yr comment_591412 Just curious, has anyone put together a BOM for the KGSSHV mini PSU? Tran told: ksc5026 and ksa1156, instead of the 2sc3840 and 2sa1486. There's more parts need for mini PSU. 2x 2K resistor, 2x 270V zener, 2x 24V zener. (You may check schematic and pcb, Dr.Gilmore has posted them.) +/- 15V capacitors size has been changed. 2x 3300uF and 2x 330uF, dimeter/pitch are 16mm/7.5mm and 10mm/3.5mm. 78/7915 don't need heatsink. Report
July 29, 201313 yr comment_591413 You need to use 270v zener if opting for the ksc and ksa. Also, total of diode strings is 500v for 450vdc and 550v for 500vdc output. Edited July 29, 201313 yr by Lil Knight Report
July 29, 201313 yr comment_591414 You need to use 270v zener if opting for the ksc and ksa. Also, total of diode strings is 500v for 450vdc and 550v for 500vdc output. Dear Tran, Need remove 270V zener if with 2SA1486/2SC3840? Thanks! Pal Report
July 29, 201313 yr comment_591416 If you are using the 2sa1486, then no 270v zeners. Thank you! Pal Report
July 29, 201313 yr comment_591439 You need to jumper the 270V zeners, not just leave them out. The Vishay 0 ohm "resistors" are good for this. Wire also works but insulation would be nice. Is it me or Spritzer just said a bad word? Wouldn't be the first time just this past minute... Report
July 30, 201313 yr comment_591533 You need to jumper the 270V zeners, not just leave them out. The Vishay 0 ohm "resistors" are good for this. Wire also works but insulation would be nice. spritzer, thanks for your comments. Report
July 31, 201313 yr comment_591773 Got the heat sinks in today. Here's how it's going to lay out... Just wonder if Kerry may make them tighter, and put them in chassis like densen's amp will looking cool . Report
July 31, 201313 yr comment_591781 Latest BOM: http://tee8tee4388.blogspot.com/2013/07/kgsshv-amplifier.html Report
July 31, 201313 yr comment_591846 We could also make the options a bit clearer with a picture of the boards and what should be populated for +/-500V, +/-450V, global feedback only, no servo etc. Report
July 31, 201313 yr Author comment_591848 You need to jumper the 270V zeners, not just leave them out. NO. The 270 volt zener is to protect the 400v pnp transistor. if that is the one you are using. you can leave it in circuit for the 600v transistor. you short it out for the simpler version of the power supply. Report
July 31, 201313 yr comment_591849 Ahh yes, better leave them in then. Been spending too much time lately walking people though the simplified PSU... Edited July 31, 201313 yr by spritzer Report
July 31, 201313 yr comment_591852 If using a matched pair 2SK170 rather than LSK389, should the pair be thermally coupled? If so, is thermal grease and shrink wrap sufficient (assuming they are close enough on the board)? Report
July 31, 201313 yr Author comment_591869 thermal epoxy is the best. otherwise a drop of thermal grease and cable tie or similar Report
August 1, 201313 yr comment_592011 NO. The 270 volt zener is to protect the 400v pnp transistor. if that is the one you are using. you can leave it in circuit for the 600v transistor. you short it out for the simpler version of the power supply. Doc, many thanks! Report
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