Along the same lines, does anyone have a recommendation for a good reed relay to use? I want the 2 Qs: Quiet and Quick. ;)
73, Chris K1AY On Mon, Sep 7, 2015 at 11:34 PM, Fred Townsend <[email protected]> wrote: > Jack: > A diode is a good idea and sound engineering practice. However if you look > at the FET schematic from the manufacture's data sheet carefully you will > see that the FET has a built in diode. That's why they make such good > relay > drivers. > 73 > Fred, AE6QL > > -----Original Message----- > From: Elecraft [mailto:[email protected]] On Behalf Of Jack > Brindle > Sent: Monday, September 7, 2015 7:49 PM > To: Jim Miller > Cc: Elecraft Reflector > Subject: Re: [Elecraft] K3 Keyout? > > If it were _my_ K3 (or K3S), I would add the very inexpensive 1N5400 or > 1N5407 diode across the relays and eliminate the worry. Even reed relays > can > produce quite a kick, and the low cost of the diode would do wonders for > peace of mind. > > This same advice goes for antenna (and other) relays switched by the KRC2. > > Jack Brindle, W6FB > > > > On Sep 7, 2015, at 5:40 PM, Jim Miller <[email protected]> wrote: > > > > Thanks all. The 200v tolerance will handle the minimal energy produced > > by the reed relay field collapsing. > > > > 73 > > > > jim ab3cv > > > > > > > > On Mon, Sep 7, 2015 at 8:32 PM, Don Wilhelm <[email protected]> > wrote: > > > >> Why do you need to look at the schematic. The K3S specification says > >> it will handle +200 volts at 5 Amps, so those are the limits at the box > level. > >> No matter what the device data sheet for a device might indicate, > >> there can be other considerations in the K3S design (or other > >> 'boxes') that say you should observe the specifications for the > >> entire unit rather than trying to re-engineer from the device > specifications. > >> > >> 73, > >> Don W3FPR > >> > >> > >> On 9/7/2015 7:59 PM, Jim Miller wrote: > >> > >>> I don't have schematics for my K3S but going by those for the K3. > >>> The KeyOut line (RCA Jack) is driven by a IRF1630 which appears to > >>> be out of production. Either than or it is a misprint and is actually a > IRF630. > >>> > >>> If the latter it appears pretty burly. Can I assume it can drive a > >>> pair of reed relays without suffering an inductive kick failure? > >>> > >>> > >>> > >> > > ______________________________________________________________ > > 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 Message delivered to > > [email protected] > > ______________________________________________________________ > 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 > Message > delivered to [email protected] > > ______________________________________________________________ > 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 > Message delivered to [email protected] > -- Life is like Linux - it never stands still. ______________________________________________________________ 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 Message delivered to [email protected]
