congo5 Posted March 7, 2016 Report Share Posted March 7, 2016 (edited) new output board, SS copper on Top. Power supply's work, some progress Edited March 7, 2016 by congo5 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted March 7, 2016 Report Share Posted March 7, 2016 Nice! I love that you have a light fixture mounted inside the chassis Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 7, 2016 Author Report Share Posted March 7, 2016 better to see the high speed electrons... Quote Link to comment Share on other sites More sharing options...
ang728 Posted March 18, 2016 Report Share Posted March 18, 2016 (edited) On 2016/2/27 at 10:18 PM, kevin gilmore said: depends on how much heatsink you have. 150mv is a good starting point Finally decided switching to Uber3+CFA2 set. got some question for uber3 what is the use for J1 Jumper and can we apply +-24V directly to uber3? thanks Edited March 18, 2016 by ang728 Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 18, 2016 Author Report Share Posted March 18, 2016 jumper J1? on what? +/-24V is going to be pretty low for uber2. Should work, but much lower power. Quote Link to comment Share on other sites More sharing options...
ang728 Posted March 18, 2016 Report Share Posted March 18, 2016 9 minutes ago, kevin gilmore said: jumper J1? on what? +/-24V is going to be pretty low for uber2. Should work, but much lower power. The J1 placed in the middle of uber3 ubal to bal. Thanks ! now I can comfortably share +/- 24V supply with CFA2 Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 18, 2016 Author Report Share Posted March 18, 2016 that is the cast input. you remove the 1k resistor and ground the I+ and i- i will relabel as cast soon. i published the balanced output/cast board this morning. 2 input boards, 2 output boards, step attenuator and relay input/output board and you have a full unbalanced/balanced/cast input/output preamp Quote Link to comment Share on other sites More sharing options...
ang728 Posted April 1, 2016 Report Share Posted April 1, 2016 CFA Boards are coming,will report back after my build is completed ! BTW,how much current per channel is balanced CFA needed? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted April 1, 2016 Author Report Share Posted April 1, 2016 About 400ma DC, peaks up to 600+ma depending on headphones Quote Link to comment Share on other sites More sharing options...
chiguy Posted April 5, 2016 Report Share Posted April 5, 2016 I'm looking at the Uberamp boards and I have a dumb question while trying to figure out the wiring and what connects to what. Can someone help me understand what connects to +/- Reg Drive on the output boards? Thanks! Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted April 5, 2016 Author Report Share Posted April 5, 2016 the golden reference power supply setup for +/-40V Quote Link to comment Share on other sites More sharing options...
chiguy Posted April 5, 2016 Report Share Posted April 5, 2016 (edited) Ahh so the +/- 40V, +/-D, FB, and GND terminal block connections serve only to connect the two boards together. I had thought the +/-40V from the golden reference power supply went there... Thanks! Edited April 5, 2016 by chiguy Quote Link to comment Share on other sites More sharing options...
ang728 Posted April 15, 2016 Report Share Posted April 15, 2016 (edited) Slowly getting some progress and other parts coming p.s still got 3 sets of CAST/ubal to bal board left Edited April 21, 2016 by ang728 Quote Link to comment Share on other sites More sharing options...
mtoc Posted April 23, 2016 Report Share Posted April 23, 2016 On 2015年4月12日 at 6:38 AM, kevin gilmore said: actually more interested in the amp, because I know I'm extremely close on the preamp part. Longing for the completed-final-version preamp though. Quote Link to comment Share on other sites More sharing options...
mtoc Posted April 24, 2016 Report Share Posted April 24, 2016 (edited) On 2016年1月21日 at 5:48 AM, kevin gilmore said: plus a very large transformer, a pair of 25 amp diode bridges and some really honking large power caps and mass quantities of heatsinks. different 25 amp diode bridges, different sound. some may sound poor. how do we choose then? as for the the power caps, is 10,000 uf overkill? Edited April 24, 2016 by mtoc Quote Link to comment Share on other sites More sharing options...
mtoc Posted April 24, 2016 Report Share Posted April 24, 2016 my head's spinning for a few hours or so, still can not figuring out how to connect the three uberamp2 and gr boards. don't know where's in and where's out. so many ins and outs. unreg + in, unreg + out, + reg drive, - reg drive, +d, -d, fb. still don't know which part is called pass transistor... could someone just provide an example. and where are the power caps, power caps is unregulated caps' another name as far as i know. and where is the often mentioned pre-reg stage, pre-reg stage = pre regulated stage as far as i guess. the caps previous mentioned are called unregulated caps, isn't this pre regulated stage thingy located in the area of the unregulated caps? pre means before, so pre-reg stage's existence is before gr because gr has diode bridge to do the regulation. and uberamp2 needs one gr with 30v and one gr with 40v, how to make them 30 and 40, there are labels ac25v, should or should not input 25vac when you need 40v or always input 25vac into gr and changing the resistors and then still get the 40v and 30v or what we need? uberamp2 actually is more than 3 boards, what i mean above is three different kind of boards. what're their names, input board, x board, and amp board or output board. Quote Link to comment Share on other sites More sharing options...
congo5 Posted April 24, 2016 Report Share Posted April 24, 2016 (edited) 6 hours ago, mtoc said: uberamp2 actually is more than 3 boards, what i mean above is three different kind of boards. what're their names, input board, x board, and amp board or output board. only names I see are 1,2,3 on the files. Uber3 is the balanced/unbal/cast input board Uber1 is what I call drivers, as they drive the output transistors. Uber2 would be the output boards On this page there is a picture showing where the six pin connectors go... you will need to build your own unregulated suppy. Large transformer(s) into 35A diode bridge(s) into large caps and that can feed the rest of the parts - the unreg in, I also use it to feed my GRLV set for +-40v which goes to Reg in +- How many sets of boards do you plan to use? 2 driver/outputs for stereo and one GRLV at 40v for Balanced outputs you will need to double everything and add the input boards Edited April 24, 2016 by congo5 Quote Link to comment Share on other sites More sharing options...
chiguy Posted April 24, 2016 Report Share Posted April 24, 2016 1 hour ago, congo5 said: you will need to build your own unregulated suppy. Large transformer(s) into 35A diode bridge(s) into large caps and that can feed the rest of the parts - the unreg in, I also use it to feed my GRLV set for +-40v which goes to Reg in +- I hadn't considered using the unregulated supply to feed the +/-40V GRLV... it would eliminate one of the needed transformers. Are there any downsides with this approach? Would you mind sharing your unregulated supply design? Quote Link to comment Share on other sites More sharing options...
congo5 Posted April 24, 2016 Report Share Posted April 24, 2016 (edited) don't really know of any downside, just using an amp or so for the grlv.. no design here just transformers into bridges into a pair of caps. the center of caps +&- are connected which is GND I read First watt articles to learn and get ideas. He has lots of class A unregulated power supplys. With the Uber... the 8 pass transistors per board do most of the work so we don't need resistors to get rid of ripple. At DIYaudio they say for class a amps we need 6-10 times the Class A output power. http://www.diyaudio.com/forums/pass-labs/207103-f5-turbo-builders-thread-425.html#post4625793 I'm starting with 1000va 36VAC trans and two 47000uf 80v caps. which is probably not enough, but leaving room to add the extra trans & caps. Edited April 24, 2016 by congo5 wrong numbers Quote Link to comment Share on other sites More sharing options...
mtoc Posted April 27, 2016 Report Share Posted April 27, 2016 On Sunday, April 24, 2016 at 6:31 AM, chiguy said: I hadn't considered using the unregulated supply to feed the ... i rememeber kg uses unregulated supply when the ampere is more than 5 amps. Quote Link to comment Share on other sites More sharing options...
mtoc Posted April 27, 2016 Report Share Posted April 27, 2016 (edited) On Sunday, April 24, 2016 at 5:10 AM, congo5 said: you will need to build your own unregulated suppy. Large transformer(s) into 35A diode bridge(s) into large caps and that can feed the rest of the parts - the unreg in, I also use it to feed my GRLV set for +-40v which goes to Reg in +- genius! now i can understand a little more of this science stuff, your tranny is 36vac, and we hook it up with a diode bridge, 36*1.4=50, and this 50v (vdc, right?) going like a river through these caps, and it becomes a liitle less than 50v now, but it keeps going, bump, into the +/-40v gr, my question is, this nearly 50v thingy goes into this +/-40v psu, actually how many relations are there between 50v and +/-40v? Does this +/-40v gal also accept 80v since 40-(40)=80? btw, have a look at the gr circuit, like the goldenreference7, the stock version is +/-20v, how could they achieve +/-3/40v? and have a second look at the circuit, there is a diode bridge on the gr board, i ain't no sure it's diode bridge or not, but it 50% is the diode bridge, that is a 4-pin molex shape sits besides the big cap on the gr board. we do this unregulated supply, and feed our unregulation into +/-many vs gr board, so the diode bridge on the gr board should be removed, right? the unregulations which go beyond the unregulated supply is already dc and dc into gr board so we no need diode bridge anymore. Edited April 27, 2016 by mtoc Quote Link to comment Share on other sites More sharing options...
congo5 Posted April 27, 2016 Report Share Posted April 27, 2016 yes the diode bridges are not needed, doesn't hurt to have them there, I didn't use them in picture above the GRLV needs to be configured to +-40v so I used two 4.5k feedback resistors in place of the 1500R (R8, R9) Some Caps need to be higher voltages, Large inputs @ 63v and the output caps at 50v or so, check schematic..... also change opa134 to opa445 Quote Link to comment Share on other sites More sharing options...
chiguy Posted April 29, 2016 Report Share Posted April 29, 2016 (edited) @congo5 Did you have any issues getting the Xicon resistors to fit on the output board? The ones available at Mouser are 49mm and the board is only able to support ~45mm. On a similar note to everyone else, what resistors did you use (or recommend)? Edited April 29, 2016 by chiguy Quote Link to comment Share on other sites More sharing options...
chiguy Posted April 29, 2016 Report Share Posted April 29, 2016 (edited) Are there insulating pads / washers for TO-264 devices out there? I'm not finding any. Additionally, I'm looking at these retantion springs too: https://www.arrow.com/en/products/thfm1/fischer-elektronik Edited April 29, 2016 by chiguy Quote Link to comment Share on other sites More sharing options...
congo5 Posted April 29, 2016 Report Share Posted April 29, 2016 (edited) 17 hours ago, chiguy said: Did you have any issues getting the Xicon resistors to fit on the output board? The ones available at Mouser are 49mm and the board is only able to support ~45mm. yes but You can bend the legs under a bit and I think they will like a bit of air under themselves for cooling 17 hours ago, chiguy said: Are there insulating pads used mica 20x25mm I ordered these: http://www.ebay.com/itm/311071328876?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT Just checked the board files and Kevin added a set of holes for longer resistors, they are 49.53mm I think that was done before the GB, if not just bend under................. Edited April 29, 2016 by congo5 Quote Link to comment Share on other sites More sharing options...
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