I've used nothing but 1n4007's for years now for relay snubbers. They work just great.
I don't bother with the slightly cheaper 1n4001's and that sort. You can get the 1N4007's cheap enough and use one type diode for everything. Some of the manufacturers don't put any identifcation on the diodes other than the cathode stripe which makes identifying the difference a pain in the butt. 73, Sandy W5TVW ----- Original Message ----- From: "Bill Coleman" <[email protected]> To: "Jack Smith" <[email protected]> Cc: "'Elecraft'" <[email protected]> Sent: Tuesday, May 12, 2009 9:54 PM Subject: Re: [Elecraft] Can a 1N4007 Be an Effective Relay Snubber? > > 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: [email protected] > 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:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.329 / Virus Database: 270.12.27/2112 - Release Date: 05/13/09 07:04:00 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
