Nomical Posted September 10, 2003 Report Share Posted September 10, 2003 Has anyone tried to swap the 7805 for a PT5101N?Someone told me this would solve all the heat problems that COULD occur when using a 7805.Datasheet (PDF): PT5101 Datasheet Quote Link to comment Share on other sites More sharing options...
slumgud Posted January 20, 2009 Report Share Posted January 20, 2009 Bump!Anyone checked this out? My 7805 gets incredibly hot.. im feeding it with 15 volts so i can use the same wallwart for core and sid Quote Link to comment Share on other sites More sharing options...
stryd_one Posted January 20, 2009 Report Share Posted January 20, 2009 Bump? Surely you mean hypersupermegabump? That's 6 years ago!That vreg is hot because you're feeding it too much. Heatsink it, and/or power it more appropriately (like, run the 5V vreg off the 9 or 12V vreg) Quote Link to comment Share on other sites More sharing options...
seppoman Posted January 20, 2009 Report Share Posted January 20, 2009 you can relieve the 7805 by following this pdf: http://www.ucapps.de/mbhp/mbhp_core_power_fix.pdf. This is working fine but you'll still need a good heatsink. I mounted that 7809 onto the back panel of my case using heat transfer paste (the stuff you use for computer processor coolers, too).That PT regulator is a switching regulator, so everything that is said about possible noise issues of switching PSUs applies here, too. There are several parts on the market that provide similar specs but are much smaller, e.g. the Recom R-78xx series (http://recom-international.de/pdf/Innoline-2008/R-78xx-1.0.pdf, available at Conrad) or the CUI V78 series (http://www.cui.com/pdffiles/V78XX-1000%20Series.pdf, available at Digikey). You might be able to use these with success, but they will introduce some noise to the 5V supply that maybe needs to be filtered out (some coils and capacitors necessary). Usinge the above cirquit with good heatsink is certainly the easiest way.S Quote Link to comment Share on other sites More sharing options...
slumgud Posted January 20, 2009 Report Share Posted January 20, 2009 I am using a heatsink. Its the one smash sells. when i power on it gets to hot to touch after about 15 min.Will try to build the circuit you linked to. I have the regulators here. No capacitators though so will have to order. Do you guys know if someone sells "sets" of the most used sort of caps? I have noticed that some values are very common...Thanks for a super reply :) Quote Link to comment Share on other sites More sharing options...
stryd_one Posted January 20, 2009 Report Share Posted January 20, 2009 Try ebay, or DIY electronics focussed stores, for the capacitor value bags :) Quote Link to comment Share on other sites More sharing options...
bugfight Posted January 20, 2009 Report Share Posted January 20, 2009 i have a few 5101's but haven't used one in a midibox yet. it works very well in my echoplex digital pro, though - no noise and far less heat than the 2 7805's it replaced. the device went from egg-frying temperature to cucumber cool. there's no reason to think it won't work fine in this application too...but if your midibox is all digital, there are cheaper ways to go Quote Link to comment Share on other sites More sharing options...
moogah Posted January 21, 2009 Report Share Posted January 21, 2009 Neat little part.. might have to try a few out :) Quote Link to comment Share on other sites More sharing options...
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