July 9, 201115 yr comment_457109 Transformers came in today so got most of the board work completed now on #2. We may case it up tomorrow. Report
July 9, 201115 yr comment_457220 Thanks guys, it's my first soldering project. My friend did the soldering on the first one. We put the boards in the cases today and made a bit more progress. Slow and steady. Really glad we tested all the transistors this time because we found one shorted k216. Troubleshooting that would have been a hassle. Report
July 9, 201115 yr comment_457221 Looking good! Double T2 FTW! Did you use some sort of heat transferring compound on the devices? Report
July 10, 201115 yr comment_457267 More progress today. Fired up the PS and all voltages are on except the +12v is +18.5v. The -12 is correct. I can't remember if this is wrong or not?? Report
July 10, 201115 yr comment_457273 What part did you use on the positive rail? You might put it under load a bit to see what happens. Say, 50mA or so. Report
July 10, 201115 yr comment_457283 I guess you mean the 7812? It is a Fairchild. I believe the On parts were recommended at some point in the thread, as the ones in the BOM that Kevin posted were not good. Check Inu's posts. Report
July 10, 201115 yr comment_457285 Yes, I remember it was said to stay away from the ST part, but I think Fairchild is all right? That's what I used in the first one. Edit: Actually, it was the 7912 from ST that was the problem. Edited July 10, 201115 yr by blubliss Report
July 10, 201115 yr comment_457290 Ah, my memory is fading I'd probably put it under a load and see what the voltage does. Also, check the voltage right after the first cap, check to make sure the ripple voltage isn't insane. Check the same after the regulator. Compare to the other rail. Edited July 10, 201115 yr by luvdunhill Report
July 10, 201115 yr comment_457293 Also, you could try swapping the two windings to see what happens... Report
July 10, 201115 yr comment_457305 Thanks, I will do some seeking, maybe just replace the 7812 too. Report
July 10, 201115 yr Author comment_457330 Did you reverse the diode next to the 7812? That could cause something like this... Report
July 10, 201115 yr comment_457392 Did you reverse the diode next to the 7812? That could cause something like this... well, they follow the silk on the PCB at least Report
July 10, 201115 yr comment_457405 blubliss has the new power supply board with the silkscreen fixed. The one diode in wrong was in the minus supply anyway. Report
July 11, 201115 yr comment_457418 Working PS now, seems like it was a bad solder joint on the 7812 ground pin. Report
July 11, 201115 yr comment_457445 Don't ya love when it's that easy?. Don't ya love it when it takes a while to find it......... Report
July 11, 201115 yr comment_457452 Don't ya love when it's that easy? For sure, and that little section only had about 8 parts, compared to all the other sections that have a kajillion parts to choose from. Phew. Report
July 13, 201115 yr comment_457861 Getting very close now, only sockets, pots, and knob to finish. I am so happy about completing it, I'm reluctant to turn it on and deal with the potential to sour my mood if it is not perfect. Report
July 13, 201115 yr comment_457866 Awesome shit dude! I'll be crossing my fingers for ya. Here's to hoping it plays beautifully. Edited July 13, 201115 yr by livewire Report
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