wink Posted February 28, 2017 Report Share Posted February 28, 2017 If you used smaller electrons, you wouldn't need such a wide insulation gap. Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted February 28, 2017 Report Share Posted February 28, 2017 8 minutes ago, wink said: If you used smaller electrons, you wouldn't need such a wide insulation gap. Yes but you need bigger electrons to let moar basses through. Quote Link to comment Share on other sites More sharing options...
JimL Posted March 1, 2017 Report Share Posted March 1, 2017 I remember years ago when Monster cable was promoting their original multi strand interconnect with thick wires for the bass and thin ones for the treble, Frank van Alstine was speaking to a Monster rep and suggested an experiment where he would take the small wires from the interconnect, solder them to an AC plug and have the rep hold on to the wires while he plugged it in. Much to his surprise, the rep declined. Quote Link to comment Share on other sites More sharing options...
G600 Posted March 2, 2017 Report Share Posted March 2, 2017 (edited) I have just completed a pair of split GRLV for the Grounded Grind. Powered by 25 VAC secondaries. I used 750V resistor for +- 15V, instead of the 1.5k for +-20V. But I'm getting +-20V, so where am I wrong ? Only one 1.5k resistor has to be changed ? Edited March 2, 2017 by G600 Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted March 2, 2017 Report Share Posted March 2, 2017 R8 and R9 from memory have to be 750ohm. Quote Link to comment Share on other sites More sharing options...
Pars Posted March 2, 2017 Report Share Posted March 2, 2017 Yes, you only change one of the two resistors.((R8+R7)/R7) x Vref((750 + 1500)/1500) x 10 = 15Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
G600 Posted March 3, 2017 Report Share Posted March 3, 2017 Briliant, thanks ! Quote Link to comment Share on other sites More sharing options...
Pars Posted March 3, 2017 Report Share Posted March 3, 2017 I know the thread is 15 pages, but this info is in here multiple times.Sent from my iPhone using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
Mirko Posted March 5, 2017 Report Share Posted March 5, 2017 Hi guys, just built the GRLV plus version but I have encountered some problems. It is configured R8=860R, R7=1500R which would give me roughly 15,4V. But here is the problem VAC is 16 and im getting 17.8V DC.. Red led D1 is not lit but D9 is. Checked the leds and transistors, everything seems to be working. Quote Link to comment Share on other sites More sharing options...
MLA Posted March 5, 2017 Report Share Posted March 5, 2017 (edited) So, I would start with reflowing all solder joints and also double check that your R8 actually is 860R. Pic of the board would help trouble shooting. Edited March 5, 2017 by MLA Quote Link to comment Share on other sites More sharing options...
wink Posted March 5, 2017 Report Share Posted March 5, 2017 On 28/02/2017 at 4:20 PM, johnwmclean said: Yes but you need bigger electrons to let moar basses through. With the bigger electrons you don't get the same volume of sub-bass....... Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted March 5, 2017 Report Share Posted March 5, 2017 On 2/28/2017 at 5:20 AM, johnwmclean said: Yes but you need bigger electrons to let moar basses through. Go for muons instead. 200 times heavier than electrons. They only live for a couple of microseconds for an added sense of speed 1 Quote Link to comment Share on other sites More sharing options...
Mirko Posted March 5, 2017 Report Share Posted March 5, 2017 3 hours ago, MLA said: So, I would start with reflowing all solder joints and also double check that your R8 actually is 860R. Pic of the board would help trouble shooting. My bad the R8 is 820R and not 860R, as I did not have 750R at hand for the desired 15V. Checked the solder joints and everything seems fine. Quote Link to comment Share on other sites More sharing options...
Pars Posted March 5, 2017 Report Share Posted March 5, 2017 (edited) That sounds similar to a problem I had with one of mine (2 pages back in this thread) when I brought it up on a variac. D1 was lit, but D9 not. Input voltage was too low and the opamp was locking up. Is your transformer actually putting out 16Vac? That should be plenty for a 15Vdc output. Edited March 5, 2017 by Pars Quote Link to comment Share on other sites More sharing options...
wink Posted March 6, 2017 Report Share Posted March 6, 2017 15 hours ago, Craig Sawyers said: Go for muons instead. 200 times heavier than electrons. They only live for a couple of microseconds for an added sense of speed I had considered neutrinos. They give the ultimate in sound transparency. But, being vitrually massless, bass reproduction suffers considerably....... Quote Link to comment Share on other sites More sharing options...
JimL Posted March 6, 2017 Report Share Posted March 6, 2017 7 hours ago, wink said: But, being massless, bass reproduction suffers considerably....... FIFY. Being massless, they are the ultimate in speed. Quote Link to comment Share on other sites More sharing options...
wink Posted March 7, 2017 Report Share Posted March 7, 2017 Jim, http://www.pbs.org/newshour/rundown/what-is-a-neutrino-and-why-should-anyone-but-a-particle-physicist-care/ Particle physicists originally believed that neutrinos were massless. But in the 1990s, a team of Japanese scientists discovered that they actually have a smidgen of mass. This tiny bit of mass may explain why the universe is made up of matter, not antimatter. http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/neutrino.html This elusive particle, with no charge and almost no mass, https://en.wikipedia.org/wiki/Neutrino The neutrino is so named because it is electrically neutral and because its rest mass is so small (-ino) that it was originally thought to be zero. Mass ≤ 0.120 eV/c2 (95% confidence level, sum of 3 flavors)[1] http://particleadventure.org/neutrinos.html Because neutrinos were produced in great abundance in the early universe and rarely interact with matter, there are a lot of them in the Universe. Their tiny mass but huge numbers may contribute to total mass of the universe and affect its expansion. There are about 100,000 of them passing through every square centimeter of the earth every second. If you had a bar of lead 1 light year long and fired 2 neutrinos down the centre, one would pass through and the other would have a 50% chance of passing through. Hope this helps...... btw, just recently some scientists believe that they have discovered a fourth flavour of neutrino. https://www.sciencedaily.com/releases/2010/11/101102185722.htm Quote Link to comment Share on other sites More sharing options...
Skooby Posted March 7, 2017 Report Share Posted March 7, 2017 Fascinated neutrino facts! Just wonder, due to their abundance, would their mass's enough to account for the universe "missing" mass without the need of "dark matter"? Sorry for hijacking the thread...we need a general thread on physics. Quote Link to comment Share on other sites More sharing options...
sorenb Posted March 7, 2017 Report Share Posted March 7, 2017 17 hours ago, Skooby said: ..we need a general thread on physics. more like a psychiatrist and pharmacist it seems 2 Quote Link to comment Share on other sites More sharing options...
JimL Posted March 8, 2017 Report Share Posted March 8, 2017 On March 6, 2017 at 9:24 PM, wink said: Jim, http://www.pbs.org/newshour/rundown/what-is-a-neutrino-and-why-should-anyone-but-a-particle-physicist-care/ Particle physicists originally believed that neutrinos were massless. But in the 1990s, a team of Japanese scientists discovered that they actually have a smidgen of mass. This tiny bit of mass may explain why the universe is made up of matter, not antimatter. http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/neutrino.html This elusive particle, with no charge and almost no mass, https://en.wikipedia.org/wiki/Neutrino The neutrino is so named because it is electrically neutral and because its rest mass is so small (-ino) that it was originally thought to be zero. Mass ≤ 0.120 eV/c2 (95% confidence level, sum of 3 flavors)[1] http://particleadventure.org/neutrinos.html Because neutrinos were produced in great abundance in the early universe and rarely interact with matter, there are a lot of them in the Universe. Their tiny mass but huge numbers may contribute to total mass of the universe and affect its expansion. There are about 100,000 of them passing through every square centimeter of the earth every second. If you had a bar of lead 1 light year long and fired 2 neutrinos down the centre, one would pass through and the other would have a 50% chance of passing through. Hope this helps...... btw, just recently some scientists believe that they have discovered a fourth flavour of neutrino. https://www.sciencedaily.com/releases/2010/11/101102185722.htm Interesting. Last time I studied physics was in the 1970s. Quote Link to comment Share on other sites More sharing options...
wink Posted March 8, 2017 Report Share Posted March 8, 2017 Physics has been an ongoing passion/affliction of mine for as long as I can remember........ Quote Link to comment Share on other sites More sharing options...
Kerry Posted March 19, 2017 Report Share Posted March 19, 2017 Just got the boards back for the GR78/9xx boards. They look good. I'm hoping to have them built up next weekend. 9 Quote Link to comment Share on other sites More sharing options...
cspirou Posted March 19, 2017 Report Share Posted March 19, 2017 Very nice! I assume it would work with the Dynalo Mini in place of the TPS7Axxxx regulators? Quote Link to comment Share on other sites More sharing options...
Kerry Posted March 19, 2017 Report Share Posted March 19, 2017 They should, though the spacing is for a T0-247 and not a T0-220, so you'd have to just be careful mounting them. Quote Link to comment Share on other sites More sharing options...
Pars Posted March 28, 2017 Report Share Posted March 28, 2017 I'm curious why the BOMs I see show Elna Silmic caps for the 220uf caps on the PSU? Usually audio grade caps are spec'd for coupling caps (Pass seems to like them), but for a PSU? Some reason that I am missing? I used Pana FM/FR for the ones I built. Sent from my iPhone using Tapatalk Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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