mahdi8 Posted June 8, 2015 Report Posted June 8, 2015 (edited) Is there a groupbuy for the dynalobal board at the moment? Edited June 8, 2015 by mahdi8 1
mahdi8 Posted June 8, 2015 Report Posted June 8, 2015 (edited) Ordering my own it is. one sigma22 board bould be enough to power two boards right? I already have a sigma22 wired for 30V. can the amp board be changed to use 30V input? Edited June 8, 2015 by mahdi8
kevin gilmore Posted June 8, 2015 Report Posted June 8, 2015 (edited) if you mess with the bias and change the opamp to opa445 you can get it to work. the input chip can handle 36v, should just make it with 30v rails all the transistors are rated at 80v, so should be ok. caps would have to be at least 50v, 25v won't work Edited June 8, 2015 by kevin gilmore
MagusG Posted June 9, 2015 Report Posted June 9, 2015 Is there a groupbuy for the dynalobal board at the moment? There needs to be, I've never coordinated one, and I'm probably too unknown to be up and doing one , but someone out there, shut up and take my money, please. Like, yesterday.
ang728 Posted June 9, 2015 Report Posted June 9, 2015 i could do an off board version with flying output transistors, then on big heatsinks, as much power as the transformer can supply looking forward to this one
Helium Posted June 9, 2015 Report Posted June 9, 2015 looking forward to this one With big output transistors? But why would you need it if Susy dynahi exists? What's the major difference? I guess none. AFAIK, it has always been like this: dynalo = w/o big output TO-220 transistors, dynahi = with big output TO-220 transistors.
kevin gilmore Posted June 9, 2015 Report Posted June 9, 2015 not exactly. dynahi has cascade on the input transistors because that was right at the limit of the fets. the bipolar part has 6 more volts rated, so cascade technically not necessary. Also vas stage has double transistors for more output current. otherwise identical. dynahi was also +/-30 and the ssdynalo was +/-20 although you could raise it a bit. boards have cleared customs should be here by Friday, and I have the parts to build and test them. once they are verified working (and I have checked the layout many times) people could go ahead with a group buy. birgir is getting me prices on the power supply. 1
gepardcv Posted June 9, 2015 Report Posted June 9, 2015 Are you testing the new Dynalo boards, the Golden Reference, or both?
ang728 Posted June 9, 2015 Report Posted June 9, 2015 oops , seems some misread on me I thought that kevin is going to draw an off board version of goldrefrence regulator it would be nice if using case with heatsink on bothsides or just case itself
kevin gilmore Posted June 9, 2015 Report Posted June 9, 2015 i will be testing the new amp boards when i get them will order the power supply board soon i'm sure i can do a completely off board version of the power supply board
gepardcv Posted June 9, 2015 Report Posted June 9, 2015 Very nice. Thanks. I like my current Dynalo a lot, but would probably build another with the Golden Reference PSU.
Helium Posted June 9, 2015 Report Posted June 9, 2015 i will be testing the new amp boards when i get them will order the power supply board soon i'm sure i can do a completely off board version of the power supply board Yes, please call Goldreference stable and final, and I will order PCBs. Interested in on board version.
lkong Posted June 10, 2015 Report Posted June 10, 2015 Yes, please call Goldreference stable and final, and I will order PCBs. Interested in on board version. I will chip in for the GoldenReference PSU board.
kevin gilmore Posted June 10, 2015 Report Posted June 10, 2015 if you want to have the power supply boards made from my posted files and send one to me, i will test. If you are sure that the board matches the schematic
kevin gilmore Posted June 10, 2015 Report Posted June 10, 2015 (edited) so 2 of the 3 simulators i use gave the same results for the power supply with the schematic shown. But ltspice oscillates. Kerry made the following changes, until i build the real thing, will not know which is right. C3,C16 4.7nf C4,C5 470pf c9,c12,c8,c15 not used no changes to the circuit board necessary for this i think Edited June 10, 2015 by kevin gilmore
Helium Posted June 10, 2015 Report Posted June 10, 2015 Sorry going to order for myself only, no experience to start GB if you meant it. Also, it's going to be rather expensive. The price of PCB house I've used to deal with is around 18-20USD per PCB of Goldenreference for the lot of 4 (180x110mm, double layer, FR-4, 1.5mm, 70um).
kevin gilmore Posted June 11, 2015 Report Posted June 11, 2015 http://gilmore.chem.northwestern.edu/goldenreference3.jpg off board version
gepardcv Posted June 11, 2015 Report Posted June 11, 2015 What is supposed to go on the board to the right of the AC inputs? The two notched rectangles with holes labeled AC1 and AC2.
kevin gilmore Posted June 11, 2015 Report Posted June 11, 2015 those are the diode bridges check the bom for the right part 1
kevin gilmore Posted June 13, 2015 Report Posted June 13, 2015 http://gilmore.chem.northwestern.edu/dsc_0658.jpg
kevin gilmore Posted June 14, 2015 Report Posted June 14, 2015 missing 4 parts. I hate it when that happens, shipping costs more than the parts I should just buy 5000 pieces of every single resistor I use...
nopants Posted June 14, 2015 Report Posted June 14, 2015 with that kind of height profile looks like you need to make a plug in version
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