Though not in the K4 manuals, the K4 KEY OUT jack (an RCA phono connector) has the same specs as the K3 KEY OUT jack: capable of keying up to +200VDC @ 5A. The K4 uses the same MOSFET as the K3, an IRFI630 (see datasheet <https://www.mouser.com/datasheet/2/427/91148-1768921.pdf>).
Note that the *other* key out line, PIN 8 on the ACC connector, is rated for 10 mA max, which is also the same as the K3. If you want to know how much current your amplifier KEY IN (relay) jack requires, short an ammeter across the KEY IN jack, negative lead to ground. This should key the amplifier relay, and then you can read the current. Usually it's way under 10 ma. 73, Bob, N6TV On Sun, Jul 4, 2021 at 10:51 AM <cw4ev...@juno.com> wrote: > Hello > I need the voltage and current ratings on the K4 Key Out > interface. Have a home brew amp that might be exceeding the K4 > switching device ratings. And I don't want to let the smoke out. Hi 73 > Bob W1XP > > > ____________________________________________________________ > Choose to be safer online. > Opt-in to Cyber Safety with NortonLifeLock. > Plans starting as low as $6.95 per month.* > > https://store.netzero.net/account/showService.do?serviceId=nz-nLifeLock&utm_source=mktg&utm_medium=taglines&utm_campaign=nzlifelk_launch&utm_content=tag695&promoCode=A34454 > ______________________________________________________________ > 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 > Message delivered to n...@arrl.net > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
