masamoto Posted February 14, 2018 Report Share Posted February 14, 2018 (edited) On 13.2.2018 at 9:44 PM, sorenb said: Yes, check your rectified input voltage ...probably too low ...or you might be pulling too much current >3A or so Rectified I get ~24 . The load is a Dynalo Mk2 not sure how much it pulls and the amp is at work. Need to take it home for deeper analysis. Will take it home and follow up. Edit: Fixed it was the Voltage Reference. Followed the voltage through the whole board to find that it's not doing it what it should. Edited February 15, 2018 by masamoto Quote Link to comment Share on other sites More sharing options...
hy2a3 Posted March 18, 2018 Report Share Posted March 18, 2018 Hi, new to Head-Case.org. I wish to build Kevin's GRLV; going over BOM, MJW21194G/93G and MJF15030G/31G is not available through the reliable Mouser nor Digikey distributors. Am I overlooking a source that most are using for the BJT's? I think not, so can you recommend alternative (s) for both complement pairs. The GRLV will be used for Kevin Gilmore's KAS5 Klone. Thanks. Quote Link to comment Share on other sites More sharing options...
Pars Posted March 18, 2018 Report Share Posted March 18, 2018 Mouser had the MJF15xxx parts in stock, but is out of the MJW2119x parts. Arrow has all of them in stock, and are reputable. I'm not sure if you could use the MJW21195/21196 instead (which Mouser does have in stock). I seem to recall Kevin saying those are fine. Looking at the datasheets for both, I can't spot any difference, but of course there must be something. https://www.head-case.org/forums/topic/12269-goldenreference-low-voltage-power-supply/?do=findComment&comment=732948 Quote Link to comment Share on other sites More sharing options...
hy2a3 Posted March 18, 2018 Report Share Posted March 18, 2018 Par, thanks for the lead. Quote Link to comment Share on other sites More sharing options...
ti5002000 Posted March 24, 2018 Report Share Posted March 24, 2018 (edited) Guys ,do i need heatsinks for the grlv, for 20v, to use with the dynalo?If yes small ones will do? Thanks Edited March 24, 2018 by ti5002000 edit Quote Link to comment Share on other sites More sharing options...
gepardcv Posted March 24, 2018 Report Share Posted March 24, 2018 (edited) It depends on the max current draw, doesn't it? For 20V with a SS Dynalo, for example, you need some heatsinking, but not a huge amount. For those builds, I just attach the devices to the aluminum chassis (through a pad, naturally) and it works well. For 30V with a SS Dynahi, I attached them to large external heatsinks. Edited March 24, 2018 by gepardcv 1 Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 24, 2018 Report Share Posted March 24, 2018 Is it the original, single ended Dynalo or the SS Dynalo? And how much voltage drop between the pre-reg and regulated output? 1 Quote Link to comment Share on other sites More sharing options...
Pars Posted March 24, 2018 Report Share Posted March 24, 2018 You probably should have something on there. Most people seem to mount them to the case bottom. On mine, which is uncased so far, I use a clip on heatsink like this: 1 Quote Link to comment Share on other sites More sharing options...
ti5002000 Posted March 24, 2018 Report Share Posted March 24, 2018 36 minutes ago, mwl168 said: Is it the original, single ended Dynalo or the SS Dynalo? And how much voltage drop between the pre-reg and regulated output? It will be for the ss dynalo and i will be using 22v secondaries transformer. 35 minutes ago, Pars said: You probably should have something on there. Most people seem to mount them to the case bottom. On mine, which is uncased so far, I use a clip on heatsink like this: yes, i have some small ones more a less the size of those.It´s just, if i can use those, i wouldn´t need to do more holes... Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 5, 2018 Report Share Posted April 5, 2018 Mini and micro versions of the gr78xx supplies... 10 Quote Link to comment Share on other sites More sharing options...
Pars Posted April 6, 2018 Report Share Posted April 6, 2018 That's really a disguised silver dollar there, isn't it Kerry Very cool! Now, tell me what these will do? 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 7, 2018 Report Share Posted April 7, 2018 Got the micro up and running. This is set for 12v. Depending on the op amp this should support from 5v to about 20v. The larger should support from 12v to 50v. Noise looks good but I really need a screened room. 9 Quote Link to comment Share on other sites More sharing options...
Kung Posted April 7, 2018 Report Share Posted April 7, 2018 great job! kerry Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 8, 2018 Report Share Posted April 8, 2018 Here's the HV version set to 450v. Have to test this one still. 14 Quote Link to comment Share on other sites More sharing options...
nopants Posted April 8, 2018 Report Share Posted April 8, 2018 gorgeousSent from my Pixel 2 XL using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted April 8, 2018 Report Share Posted April 8, 2018 Wow! 1 Quote Link to comment Share on other sites More sharing options...
UFN Posted April 8, 2018 Report Share Posted April 8, 2018 Seriously impressive Kerry (as usual ) 1 Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted April 8, 2018 Report Share Posted April 8, 2018 Kerry, what is feeding these during the testing (bench supply?) and what is the load? Would you be able to do some measurements with some decent ripple in the input (say 500mV) and a decent load (1A?) Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 8, 2018 Report Share Posted April 8, 2018 1A at 450V – yeh, that’s a pretty decent load 1 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 8, 2018 Report Share Posted April 8, 2018 I should be able to test the low voltage version with some decent ripple at 1A a bit later in the week. Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 10, 2018 Report Share Posted April 10, 2018 (edited) I was able to get the 450v supply up and running. I did have one error on the board. The current source feeding the 10v reference gets up to 150 degree F, but I can add more copper around it. I think it will be just fine. I was running this with a 110mA load. Edited April 10, 2018 by Kerry 8 3 Quote Link to comment Share on other sites More sharing options...
Laowei Posted April 10, 2018 Report Share Posted April 10, 2018 That’s just so incredible. Awesome work Kerry. 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 21, 2018 Report Share Posted April 21, 2018 Here's the accompanying board for the GR HV & LV supplies. It's got a built-in controller to turn the HV on after a delay (if needed) along with a power LED indicator (flashing to solid). I've also added a tap for both Normal and Pro bias. 12 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 22, 2018 Report Share Posted April 22, 2018 Nice. Like the 08N100D up there. IC1 is? 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 22, 2018 Report Share Posted April 22, 2018 It's an optional 5v regulator (LM7805CDT) to power the delay timer. You can also use an external supply for the that. I've set this up so you can use either the built in current regulator on the grhv78xxx or the 08N100D as an external regulator. 3 Quote Link to comment Share on other sites More sharing options...
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