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
[hidden email]
I'd rather be learning.


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[Don Wilhelm-4]

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

On 3/1/2012 11:03 AM, Richard Fjeld wrote:
> 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
>
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[Augie "Gus" Hansen]

On 3/1/2012 9:03 AM, Richard Fjeld wrote:
> 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

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[Jim Brown-10]

On 3/1/2012 8:03 AM, Richard Fjeld wrote:
> 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
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[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" <[hidden email]>
To: "Richard Fjeld" <[hidden email]>
Cc: <[hidden email]>; "elecraft posting"
<[hidden email]>
Sent: Thursday, March 01, 2012 10:16 AM
Subject: Re: [Elecraft] K3; 8 volts with Mic Bias off.

> 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
>
> On 3/1/2012 11:03 AM, Richard Fjeld wrote:
>> 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
>>

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