Guest sawyers Posted March 9, 2010 Report Share Posted March 9, 2010 So far, 2 silk screen errors. Total. Plus the holes on the 3381's a bit tiny. Plus one zener hole a bit tiny. Pretty fucking good for a project of this magnitude. I challenge anyone to do a project of this scope and get it 99.99999999% right the first time. Absol-bloody-lutely! Stunningly great piece of work Kevin. I've never done PCB design anything like this large or complex, and I've always had a greater mistake density. Didn't mean to come across as a knit-picker Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 9, 2010 Report Share Posted March 9, 2010 Kevin, If those are SumR transformers double check the secondaries by hand. On the last trafo he made for me (for the BHse) he mis-marked the center tap on one of the secondaries, which thankfully didn't cook anything. I always test the AC out of all transformers first. And unloaded power draw checking for shorted turns. In fact i also check every semiconductor (especially the led's) and measure the resistors. Saves a lot of time later. Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 9, 2010 Author Report Share Posted March 9, 2010 Checking every component is well worth it (especially the leds since they are a pain to remove later on). Thanks for the warning Nate, the CT on my KGSS transformer was in the wrong spot or I just misunderstood the SumR specsheet. Quote Link to comment Share on other sites More sharing options...
nattonrice Posted March 9, 2010 Report Share Posted March 9, 2010 I'm glad that I'm not the only sod who checks every resistor Quote Link to comment Share on other sites More sharing options...
n_maher Posted March 9, 2010 Report Share Posted March 9, 2010 Checking every component is well worth it (especially the leds since they are a pain to remove later on). Thanks for the warning Nate, the CT on my KGSS transformer was in the wrong spot or I just misunderstood the SumR specsheet. That's exactly what happened on mine, the CT was marked wrong. Thankfully it was a low-voltage mistake but I'm not happy to hear it's happened more than once. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 9, 2010 Report Share Posted March 9, 2010 The 534-1847 are the wrong size, I will have to measure again... Should be 534-3487... So .5 instead of .625 (actual is .55 which is .5 with a .05 spacer) I ordered .375 anyway ?? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 12, 2010 Report Share Posted March 12, 2010 http://gilmore.chem.northwestern.edu/t2chassis29.jpg Soooo close... 1 more resistor value on backorder wire stax jacks Will finish wiring the power supply tomorrow. Few more screws, nuts and bolts... Quote Link to comment Share on other sites More sharing options...
Inu Posted March 12, 2010 Report Share Posted March 12, 2010 http://gilmore.chem.northwestern.edu/t2chassis29.jpg Soooo close... 1 more resistor value on backorder wire stax jacks Will finish wiring the power supply tomorrow. Few more screws, nuts and bolts... Wow, nice gold Mabuchi motor on the board! Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 13, 2010 Report Share Posted March 13, 2010 Wow, nice gold Mabuchi motor on the board! I was not aware that mabuchi made motors this expensive Quote Link to comment Share on other sites More sharing options...
swt61 Posted March 13, 2010 Report Share Posted March 13, 2010 Why Kevin, what a long shaft you have! Quote Link to comment Share on other sites More sharing options...
deepak Posted March 13, 2010 Report Share Posted March 13, 2010 Looking great KG Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 13, 2010 Report Share Posted March 13, 2010 another correction to the bom the spacers (.5 inch and 2 inch) are supposed to be 4-40 not 6-32 Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 13, 2010 Report Share Posted March 13, 2010 updated amplifier schematic http://gilmore.chem.northwestern.edu/t2schem.pdf Quote Link to comment Share on other sites More sharing options...
n_maher Posted March 13, 2010 Report Share Posted March 13, 2010 I can't believe that 4 330k resistors are getting in the way of this thing making music. Looks great though and thanks for all the documentation Kevin. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 13, 2010 Report Share Posted March 13, 2010 I can't believe that 4 330k resistors are getting in the way of this thing making music. Patience grasshopper. It will make music soon. Very soon. Have to finish power supply first. Worked on it 3 hours today and 2 hours tomorrow should finish it. Had to go to tristate electronics for the right size spacers. Ordered the rest of the parts including xlr connectors to make cables with which to hook it up to a source, plus the right sized spacers for the amp board. No reason to rush this, it will be done in plenty of time for CJ010. I want it perfect the first time it powers on. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 14, 2010 Report Share Posted March 14, 2010 http://gilmore.chem.northwestern.edu/t2power3.jpg Got to find better 1/4-20 bolts. 2 of them have cracked off at the screw head. Quote Link to comment Share on other sites More sharing options...
swt61 Posted March 14, 2010 Report Share Posted March 14, 2010 That is so flippin' nice! I can hardly wait to hear what you have to say about how it sounds. Just awesome! Quote Link to comment Share on other sites More sharing options...
n_maher Posted March 14, 2010 Report Share Posted March 14, 2010 Patience grasshopper. My impatience certainly wasn't with you Kevin, I perhaps mistakenly thought that those resistors were out of stock and it seemed like a pisser that the amp would have to wait for them. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 14, 2010 Report Share Posted March 14, 2010 The resistors ARE on backorder. But they are not really important as they are the input filter. Too bad i did not wire the stax jacks, I would have something to listen to already ATOMIC BATTERIES TO POWER TURBINES TO SPEED PHASERS ON STUN http://gilmore.chem.northwestern.edu/t2amplifier1.jpg all voltages look good... Filament transformer is a slight bit high... The output tubes are 6.5 vac the input tubes are at 6.7 vac. Don't trust my 30 year old meter, so i'll bring home something recent and calibrated before i re-spec the filament transformer. Quote Link to comment Share on other sites More sharing options...
Les_Garten Posted March 14, 2010 Report Share Posted March 14, 2010 Oooohhhh, Lookey there! Quote Link to comment Share on other sites More sharing options...
Torpedo Posted March 14, 2010 Report Share Posted March 14, 2010 stunning. Congratulations for such a nice built. I hope you can listen to it soon Quote Link to comment Share on other sites More sharing options...
Hopstretch Posted March 14, 2010 Report Share Posted March 14, 2010 Epic! Did you have to take the tranquilizers before firing it up? Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 14, 2010 Author Report Share Posted March 14, 2010 Pure fucking win there. Quote Link to comment Share on other sites More sharing options...
Beefy Posted March 14, 2010 Report Share Posted March 14, 2010 I almost feel dizzy looking at such awesome Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted March 14, 2010 Report Share Posted March 14, 2010 woah Quote Link to comment Share on other sites More sharing options...
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