[Elecraft] Yamaha CM500 wiring for K2?

[Jim Brown]

On Fri, 15 Jan 2010 09:03:55 -0600, Randy Moore wrote:

> Does anyone have the wiring for the CM500 to connect to the K2? Or
> just the pin-out for the CM500 stereo connector?

Connect the "tip" of the CM500 mic connector to the mic input pin of the 
K2, connect the "ring" of the CM500 mic connector to the +DC pin on the 
K2 mic connector through a resistor of about 5K (value not critical), 
and connect the "shell" of the CM500 mic connector to the shell of the 
K2 mic connector. 

Two ways to do this. For both you need to buy an 8-pin connector. Method 
1) Cut the connector off the CM500, strip the wires and identify which 
color goes to which pin. Strip the wires from the headset and wire them 
to the 8-pin connector.  

Method 2) Don't cut any wires. Buy a female 1/8-inch jack from Full 
Compass (a very good pro audio vendor in Madison, WI) and make an 
adapter. 

http://www.fullcompass.com/product/339102.html

You'll pay $1.30 for one connector and about $8 to ship it. :)  That's 
silly, of course, but it's how life is. So instead of buying only one 
connector, think about other connectors you need and stock up. I did 
this about two weeks ago and bought ten each of four types of hard to 
find connectors. 

I strongly recommend method 2. You'll find that this mic and headphones 
work really well on a computer, and on the K3. For these uses, you need 
no adapter at all -- they plug straight in. 

Note that I haven't identified which pins on the K2 connector are which 
-- that depends on how you wired it when you built it, so check the K2 
manual and your build notes for that detail. 

73,

Jim Brown K9YC