K3 & Heil HM-10 Dual

If you use an electret with no bias you have no audio.  What happens if
you use a dynamic mic with bias on such as the HC4/HC5 element in the
subject line?

John KK9A

From: Don Wilhelm
Tue Apr 18 07:35:33 EDT 2017

"Rule of thumb" - if the microphone produces any audio at all with no
bias, it should be run with no bias - it is a dynamic type.
Electret elements will not produce any audio at all unless bias is
turned on.

73,
Don W3FPR

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[Don Wilhelm]

John,

If you apply bias to a dynamic mic, the microphone element will be
pulled off center by the bias voltage.  Much the same as putting a
voltage across a speaker.
It *could* damage the element is the element wire is not large enough to
handle the current, but with the mic element not in its neutral
position, the mic may sound funny.

73,
Don W3FPR

On 4/18/2017 1:59 PM, [hidden email] wrote:
> If you use an electret with no bias you have no audio.  What happens if
> you use a dynamic mic with bias on such as the HC4/HC5 element in the
> subject line?
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