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PT5101N instead of 7805


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  • 5 years later...

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

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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 :)

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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

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