JoaMat Posted June 12, 2015 Report Posted June 12, 2015 (edited) ...tighter, tightest. Very nice indeed! Is there room for a trafo as well? Ooh, is there maybe a trafo hidden under PSU? Edited June 12, 2015 by JoaMat
mwl168 Posted June 12, 2015 Report Posted June 12, 2015 impressive work as always John. Congrats! Have you measured the temperature inside the enclosure yet?
spritzer Posted June 12, 2015 Report Posted June 12, 2015 If you aren't scratching your head wondering how this will all fit then DIY is just too easy. On that note, a mini Carbon is in the works...
gepardcv Posted June 12, 2015 Report Posted June 12, 2015 On that note, a mini Carbon is in the works... Wait. What? More details please!
johnwmclean Posted June 13, 2015 Report Posted June 13, 2015 Have you measured the temperature inside the enclosure yet? No need so far, it’s only just warmish after a couple of hours. Ooh, is there maybe a trafo hidden under PSU? Indeed there is, I’ve just added pics in the builds thread.
johnwmclean Posted June 13, 2015 Report Posted June 13, 2015 Very nice. Dimensions? 313mm (w) x 267mm (d) x 151.5mm (h)
mwl168 Posted June 13, 2015 Report Posted June 13, 2015 Goodness! That's compact! Wiring must've been fun!
spritzer Posted June 13, 2015 Report Posted June 13, 2015 Will it fit in an Altoids can? Yes but the heatsinks are extra...
JoaMat Posted June 13, 2015 Report Posted June 13, 2015 (edited) / Edited November 11, 2015 by JoaMat
kevin gilmore Posted June 13, 2015 Author Report Posted June 13, 2015 (edited) oops going to fix that in other news, these Vikings seem to want SMALL, so this is for soren to fit into a 2U http://gilmore.chem.northwestern.edu/kgsshvpssicfetsingle.jpg in other other news, Kerry did a HV version of the goldenreference, will evaluate now. Edited June 13, 2015 by kevin gilmore
Laowei Posted June 13, 2015 Report Posted June 13, 2015 Very nice Kevin. With split secondary AC input, can 2 small boards be stacked for +/-400VDC? Also FWIW. the zener stack for the 10m90s shows 500V.
kevin gilmore Posted June 13, 2015 Author Report Posted June 13, 2015 details, details, you get the idea. zener stack 500v for 450v output, 450v for 400v output and yes the idea is that you stack 2 of them. sure looks like the carbon really would fit in a single 2U heatsink box this way. still have to do a bias supply, and a simple +/-15 board
nopants Posted June 14, 2015 Report Posted June 14, 2015 Doesn't birgir have a standalone pcb for generating bias? He also has that board for mounting triad fs36 seems like all the bases are already covered
insanity Posted June 14, 2015 Report Posted June 14, 2015 I have watched the problem I described below and it still persists. Does anyone have an idea what I could check or replace? Since the volume of the sizzling I hear only through the headphones is dependent on the volume set on the elma stepper I am confused where it could originate? Does it make sence to assume it is not coming from the amp board, but from the elma stepper or so? I recently noticed a strange behaviour of my good old KGSSHV which has probably been there from the beginning, but has gone unnoticed with the 009. Now I have the 007 and I had to turn up the volume a few clicks (elma stepper). I now also notice it with the 009, because I now what to listen for. During the warmup phase, one channel presents a sizzling noise which is clearly noticeable but not loud. After the amp has been running for some time, it dissappears. Does anyone have an idea? I have removed the amp board and visually checked it. Also used the opportunity to add 100ohm input resistors. The problem still persists. The sizzling changes in volume when I turn the volume pot. If the sizzling originated from some arcing, changing the volume should not have and impact? yes? There is no audible physical noise coming from the amp. The first thing I did was checking balance and offset. Both were good. I will try my best to describe what I hear. Its a noise similar to what you hear, when you push the headphone cups against the head but less loud/less pronounced. It is not continous, more like there one second, gone the other. The volume of the sound becomes louder when I turn the stepper to increase the volume.
spritzer Posted June 14, 2015 Report Posted June 14, 2015 Bypass the Elma and see what happens. Those switches are notorious for corrosion and connection issues after a few years.
kevin gilmore Posted June 14, 2015 Author Report Posted June 14, 2015 I have had nothing but grief with the elma (dact) things. after a while the contacts go high impedance. same as the khozmo.
insanity Posted June 14, 2015 Report Posted June 14, 2015 (edited) Ok I did the following test. When I removed the input wires from both boards, without grounding the inputs, the sizzling channel started sizzling well noticeable, whereas the other channel remained almost silent. Interestingly, when I grounded the inputs from the sizzling channel it was almost quiet, with the sizzling being barely noticeable to unnoticeable. This seems to rule out the elma as a source of the problem. Does this sound more like a problem of the first amplifier stage or another stage? What parts would you start working at? lsk389 and mpsw06? below it? I don't have a scope... Edited June 14, 2015 by insanity
kevin gilmore Posted June 14, 2015 Author Report Posted June 14, 2015 (edited) so Kerry did the analysis on this, and his name is on the board, for the next version and I appreciate his help. This is a big deal because it has essentially 1 less stage, so it runs on as little as 50 volts unreg to reg, so it generates less heat. with 75 volts difference you can run 550V caps with 25V of margin at 450V output http://gilmore.chem.northwestern.edu/kgsshvpssicnew.jpg 6.0 x 6.5 inches if I can just find a way to get rid of the one red, you could make this as single sided like some of the rest of the new ones. Edited June 14, 2015 by kevin gilmore
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