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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