i’m not interesting in using the 8V line for mic element bias. That was someone else. My application is to power an external device between a mic and a K3/K4 from that line.
I can, of course, use a battery. But it would be much simpler if the 8V line could supply at least 20ma without releasing smoke :-) The individual that asked this question initially, was looking for the possibility of 50ma. Grant NQ5T > On Jul 26, 2020, at 8:21 PM, Don Wilhelm <[email protected]> wrote: > > Grant, > > The MH2/MH4 mic does not use the 8 volts directly - there is a resistor > between the 8 volt supply and the AF line, > and that is where the 10ma is used to power the electret elemant. > The 10 ma. used by the microphone has nothing to do with the total current > available from pin 6. > > 73, > Don W3FPR > > On 7/26/2020 8:05 PM, Grant Youngman wrote: >> I have the same question about the current available for the 8V at the mic >> connector. Is it limited to 10ma, or will it actually support a somewhat >> higher continuous current draw safely. Not just for the k3, but also the K4. >> >> Grant NQ5T >> >> >>> On Jul 26, 2020, at 7:46 PM, Don Wilhelm <[email protected]> wrote: >>> >>> Henk, >>> >>> If indeed it is for a mic preamp, then try it without the preamp. The K3S >>> has 2 stages of mic AF gain. Normal for the usual ham mics, and a Hi level >>> for low gain mic elements. >>> >>> You must turn on bias to have the 8 volts appear at the mic jack. Do not >>> use with direct connection of a dynamic mic - it makes the mic 'sound >>> funny'. >>> >>> 73, >>> Don W3FPR >>> >>> On 7/26/2020 5:40 PM, Nr4c wrote: >>>> What are you going to use this voltage for? I think it’s for a mic >>>> preamp. It is not the source of bias for an electret mic. That comes on >>>> the mic pin when turned On in the menu. >>> ______________________________________________________________ > ______________________________________________________________ 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]
