[Elecraft] K3; 8 volts with Mic Bias off.

[Richard Fjeld]

My K3 is a year old. I was going to try a dynamic mike and tested the pinouts first, and notice that the 8 volts is present either with bias on or off. I'm using the front panel mike jack. I don't dare connect the dynamic mic.


Richard Fjeld, n0ce
rpfjeld at embarqmail.com
I'd rather be learning.

[Don Wilhelm]

Is that 8 volts you are referring to on pin 1? If it is still present
with bias turned off, then you have a K3 problem, contact support.
There is always 8 volts on pin 6.

73,
Don W3FPR

Post by Richard Fjeld
My K3 is a year old. I was going to try a dynamic mike and tested the pinouts first, and notice that the 8 volts is present either with bias on or off. I'm using the front panel mike jack. I don't dare connect the dynamic mic.
Richard Fjeld, n0ce

[Richard Fjeld]

Oh. I saw pin 6 labeled as 8V and thought that was the bias. (Haven't had
much sleep due to doing snow removal.)

Thanks, Dick, n0ce

----- Original Message -----
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Richard Fjeld" <rpfjeld at embarqmail.com>
Cc: <Elecraft_K3 at yahoogroups.com>; "elecraft posting"
<elecraft at mailman.qth.net>
Sent: Thursday, March 01, 2012 10:16 AM
Subject: Re: [Elecraft] K3; 8 volts with Mic Bias off.

Post by Don Wilhelm
Is that 8 volts you are referring to on pin 1? If it is still present
with bias turned off, then you have a K3 problem, contact support.
There is always 8 volts on pin 6.
73,
Don W3FPR

Post by Richard Fjeld
My K3 is a year old. I was going to try a dynamic mike and tested the
pinouts first, and notice that the 8 volts is present either with bias on
or off. I'm using the front panel mike jack. I don't dare connect the
dynamic mic.
Richard Fjeld, n0ce

[Augie &quot;Gus&quot; Hansen]

Post by Richard Fjeld
My K3 is a year old. I was going to try a dynamic mike and tested the pinouts first, and notice that the 8 volts is present either with bias on or off. I'm using the front panel mike jack. I don't dare connect the dynamic mic.

The bias settings (on/off) are independent for the front and rear
mic jacks. Are you adjusting the correct one for the position in use?

Gus Hansen
KB0YH

[Jim Brown]

Post by Richard Fjeld
otice that the 8 volts is present either with bias on or off. I'm using the front panel mike jack. I don't dare connect the dynamic mic.

Bias is applied through a resistance of about 5K ohms, so the DC current
is far too small to damage a dynamic mic. You would NOT want to apply
it to a ribbon mic.

73, Jim K9YC