Rowan Posted January 15, 2015 Report Share Posted January 15, 2015 (edited) Hi All, I'm getting prepared to build a MB-6582, studying all the documentation. I have found something that is a bit confusing and wanted to check for the answer long before I come to the problem....... The MB-6582 Base PCB Construction Guide Sates in the PSB B option section jumper J73 should be bridged for PSU Bhttp://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_base_pcb_construction_guide But in the MB-6582 Base PSB Parts Guide this is contradicted.http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_parts_list Note 3 at the bottom states that J73 should only be used for PSU C. Which is correct? Thanks, Rowan Edited January 15, 2015 by Rowan Quote Link to comment Share on other sites More sharing options...
smashtv Posted January 15, 2015 Report Share Posted January 15, 2015 We definitely need to find a way to explain this better in the wiki - if anyone has any suggestions please post! Short answer: If your PSU generates regulated 5v, fit a jumper @ J73/connect pins 1 & 2 of J73 to each other. If your PSU generates unregulated 5v, wire J73:pin1 to J74:pin1 and wire J73:pin2 to J74:pin2. You will also need to fit C13, C14, and V4. Long answer: Regulated 5v input: The 5v rail comes in @ J1, routes through the power switch, then a jumper at J73 ties the 5v rail to all of the 5v traces on the board. 5v path=green: Unregulated 5v input: The 5v rail comes in @ J1, routes through the power switch, then a wire from J73:pin2 to J74:pin2 takes it through V4 to give regulated 5v at J74:pin1. A wire from J74:pin1 to J73:pin1 connects that regulated output from V4 to all of the 5v traces on the board. 5v path=green/wires=yellow: Best regards Tim Quote Link to comment Share on other sites More sharing options...
Rowan Posted January 15, 2015 Author Report Share Posted January 15, 2015 Thanks for the explanation, that makes sense. I'm going for PSU option B with a C64 PSU, If I understand this correctly I should close jumper J73 as the C64 PSU provides has a regulated 5V supply? Regards, Rowan Quote Link to comment Share on other sites More sharing options...
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