That's even better..no cutting of lands on the control board as I would have had to do.
Thanks once again Don! And Happy Thankgiving to all on the reflector. 73 de Tom K2TA K2 #1117-C ----- Original Message ----- From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> To: "Tom Althoff" <[EMAIL PROTECTED]>; "Elecraft" <[email protected]> Sent: Tuesday, November 23, 2004 9:17 PM Subject: Re: [Elecraft] MD2 resistor mod - a different approach? > Tom and all, > > There is a solution to using a mic requiring the 5 volts (through a > resistor) and switching to a mic that does not need it which does NOT > require the resistor to be in the mic plug. > > Wire the resistor at the mic jack between pins 5 and 6 (pin 5 = FUNC which > is not used), then in the mic plug for the microphone(s) needing the 5 > volts, add a jumper from pin 5 to pin 1. The mic jack will have only AF on > pin 1, and will have +5 volts through the resistor on pin 5. > > When wired this way, your Elecraft mic will work on other K2s wired for the > standard Elecraft mic, but another standard Elecraft mic will not work on > your K2. > > Additional note - if NONE of your mics have the UP and DOWN buttons > implemented, you can use pins 3 and 4 for any purpose you wish - including > piping the +5 volts on one of these pins instead of pin 5. > > 73, > Don W3FPR > > > ----- Original Message ----- > > I want to be able to switch between my MD2 mic which needs DC applied to the > AF line and my Heil Proset Plus headset which doesn't. > > I'm not sure I could fit the resistor that comes with the MD2 inside the > female connector at the mic side so I'm looking into connecting pins 6 and 1 > together in the female mic connector and putting the resistor in SERIES > with the 5 VDC line going to pin 6 at the male end of the jack. > > When the MD2 is plugged in the AF line would get DC applied through the > dropping resistor in the 5 volt line. When I plug in the Proset Plus pin 1 > is just audio and no DC applied. > > Does anyone see a problem with doing it this way? I know you won't be able > to pull a lot from the 5 volt line after this mod but I don't plan on > powering anything else off of the mic connector. Also...I would not be > able to plug my mic into someone else's K2 as it would put the unlimited > 5VDC line directly to my mic element. I practice safe microphoning and > never insert my mic into any other K2 except my own so I'm not concerned in > either case. > > Comments? Suggestions? > > Tom K2TA > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
