I wanted to try out a Electret Mic (old computer mic) with my K2, so came up
with the following to provide the bias voltage. I took a computer jumper
short and carefully with my Demel tool cut the short (at the top of the
jumper), then probed around a old junked computer board till I found a small
in physical size 5K ohm surface mount resistor. After removing the resistor
from the junked board, I just sweat solder it across the computer jumper
short and plug it into pin 6 of the jumper board, I then wired up a 8 Pin
mic connector to a stereo headphone connector with the bias line going to
the tip and the audio line going to the ring of the stereo connector. It
works great to try out cheap computer mics with the K2.
It should be noted I have changed R1 on the KSB2 to 5K and it works great
with my Heil Mic. Prior to the change out of R1 I did not get enough audio
from the Heil mic.
I now needed a way to listen to the different mics, well if you set the K2
menu to SSBA BAL you can listen to the audio on headphones, so why not feed
it into the computer using my home brew PSK31 interface to record the
various mics on the recorder of the computer and then can play it back. I
find this works a lot better, then trying to talk into the mic and listen to
yourself at the same time.
For general interest I seem to get equally good audio reports with the cheap
Electret computer mic, a computer headset mic and my HC5 element in my old
MC50 mic. Listening to the recordings of the mics I cannot tell the
difference.
Just some ideas.
73,
Steve Ray K4JPN ex K1VKW
EM82ep Warner Robins GA
Elecraft K2 1422 & KPA-100
Heath Fan HW-101, HW-8
http://www.thewinstonator.com/k4jpn.htm_______________________________________________
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