Any of the 1N400x series work well for this purpose. I've slowly learned the lesson that as a very small kit provider that it's often cheaper to use the same part in multiple kits even though it may be over-rated for some applications because the increased volume reduces the price, fewer stock keeping concerns, etc.
Hence, my "standard power diode" for designs (reverse voltage protection, relay snubbing, etc.) is the 1N4007. And, there's no "theory" that I'm aware of predicting a 1N4007 diode has a slow turn-on time. What there seems to be the case is that because these diodes have a slow turn-off time (predicted by theory and confirmed in practice), hams have confused the two and reached the incorrect conclusion that slow turn-off = slow turn-on. Quite different physics are at work in these two conditions. Jack Bill Coleman wrote: > On Apr 8, 2009, at 2:22 PM, Jack Smith wrote: > > >> The "Cliff's Notes" version is that the turn-on (note I said turn-on, >> not turn-off) time of a 1N4007 diode is sufficiently fast to be a very >> effective relay snubber. >> > > > Interesting! It's always true that experiment trumps theory. > > Curious, though, that you would promote using a 1N4007 as a snubber > for a 12 volt relay. It would make more sense to use a 1N4001, which > has virtually identical characteristics as the 1N4007, except for the > reverse breakdown voltage. The 1N4001, with a reverse breakdown of 50 > volts, it will withstand the relay energizing voltage of 12 volts. > > The 1N4001 can be purchased for about a penny each in bulk. The 1N4007 > is about four times more expensive. That's a three cent difference. > And, you know, hams are cheap. <grin> > > > Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net > Web: http://boringhamradiopart.blogspot.com > Quote: "Not within a thousand years will man ever fly!" > -- Wilbur Wright, 1901 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
