[Boatanchors] audio transformer

[Bob Peters]

Jim Dream on at Radio shack for $10...Maybe for the transformer...We
manufacture those and my manufactured cost is more than that for speaker and
tranny...

Very Best 73's
Bob Peters
W1PE

ARRL, QCWA, AM FOREVER

Money is only temporary, Radio is forever
>From The Old Dog



-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Jim Wiley
Sent: Friday, February 12, 2010 5:53 PM
To: Dick KF4NS
Cc: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] audio transformer


Use a "70 volt" PA system matching transformer in reverse.  These
transformers have several taps on the primary winding, marked in watts.
For example, and if I remember correctly, using a "10 watt"
transformer,  the 10 watt tap is set to transform roughly 500 ohms to 8
ohms.  Such transformers can often be obtained for free from
scrapped-out PA system speakers - the transformers are riveted to the
side of the speaker frame.  Look for an office building being
remodeled.  New ones from radio shack are typically about $10.00.


- Jim, KL7CC


Dick KF4NS wrote:
> What you you guys suggest as a simple approach to adapting my various 
> 8 ohm audio output radios to my surplus telephone switchroom amplified 
> speaker which has 600 ohms as the lowest input impedence available?
>
> If I had a proper ratio xfmr I would try it but could not find one in 
> the parts box.  Any ideas? 
>
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