From: "David Austin" 
Subject: Re: [drakelist] Impedance convertor


Thanks to Garey, Al and Richard for your suggestions. Wasn't sure if using a
transformer would provide enough drive, but obviously it will!

73,

David
G4GTP


----- Original Message ----- 
From: "Garey Barrell" 
To: "David Austin" 
Sent: Wednesday, April 21, 2004 10:05 PM
Subject: Re: [drakelist] Impedance convertor


> David -
>
> Heil makes a step-up transformer, but if it was me, I'd just
> pick up a small filament transformer and see what it sounds
> like!   Better choice would be something like an audio
> "Line" transformer, but not as likely to have one of those
> around.
>
> All you need is a voltage step-up from the millivolts from a
> dynamic (think loudspeaker backwards) microphone (Lo-Z) to
> the hundreds of millivolts needed for a Hi-Z mike input.   A
> simple one transistor preamp (similar to what's in the base
> of a D-104) would also do.
>
> 73, Garey - K4OAH
> Atlanta
>
> David Austin wrote:
>
> > I seem to have mislaid my Shure 201 hand mike, but I do have a 500 ohm
impedance dynamic mike. Anyone know of a simple impedance converting circuit
(or other method) to be able to use the dynamic mike with my T4X?
> >
> > Thanks,
> >
> > David
> > G4GTP
>

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