Diode identification?
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From: Dave Platt on 2 Mar 2007 17:09 >flywheeling diode and a 1N4007 would do the job just fine. Does the FET >source go to ground ? Many power MOSFETS have a diode internally in that >orientation across from the source to the drain. It gets there as an >integral side effect of the manufacturing process. Newer designs seem to use a fast-recovery diode (e.g. FRED or HEXFRED or HiperFRED) for MOSFET flyback protection. 1N4007s aren't particularly fast, and reverse-conduction losses can be significant if the switching frequency is high (in e.g. an SMPS). That's probably not all that much of an issue in a solenoid driver, though. -- Dave Platt <dplatt(a)radagast.org> AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads!
From: Lostgallifreyan on 2 Mar 2007 18:56 Palindrome <me9(a)privacy.net> wrote in news:LQYFh.91285$k82.61028(a)fe07.news.easynews.com: > Not wishing to trach granny, but this would be my approach: > I hope it doesn't come to that, if she has any breathing difficulties at all, I imaging it's just due to the rarified air of this place.
From: Ben Miller on 2 Mar 2007 19:34 > Anode of unknown diode is to ground, cathode to drain of BUZ72 MOSFET. 1uF > cap also from drain to ground. Drain connects to solenoid. Drive voltage > is > 42vdc. The diode is a snubber to bypass the inductive kick from the solenoid when it deenergizes. A 1N4007 will work fine. Ben Miller -- Benjamin D. Miller, PE B. MILLER ENGINEERING www.bmillerengineering.com "John E." <incognito(a)yahoo.com> wrote in message news:0001HW.C20DD98F01F38FF6F01826C8(a)news.sf.sbcglobal.net...
From: Eeyore on 2 Mar 2007 19:37 "John E." wrote: > It's shorted, burned on the side against the board, the side of the diode > that has part of the p/n printed (of course)... > > Best I can make out is (reading around the diode: > ITT > 4? > 47 > > Physically it resembles a typical 1A black epoxy rectifier. That's not what either a 1N4147 or 1N4447 looks like. Graham
From: Franc Zabkar on 2 Mar 2007 20:51
On Fri, 02 Mar 2007 16:49:16 GMT, John E. <incognito(a)yahoo.com> put finger to keyboard and composed: >It's shorted, burned on the side against the board, the side of the diode >that has part of the p/n printed (of course)... > >Best I can make out is (reading around the diode: > ITT > 4? > 47 > >Physically it resembles a typical 1A black epoxy rectifier. > >Would this be 1n4147? The "47" is clearly visible, and I think I can make out >a "4" in the first part of the poorly-legible digits. No telling how many >digits between the two "4"s. > >Any possibilities other than 4147? > >Thanks, Go here ... http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm .... and type the following into the search box: 1n4*47 - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |