[Boatanchors] audio transformer

[Dick KF4NS]

What a bunch of great ideas !

Unfortunately (or I guess fortunately) after all the considerations, I 
went through all my parts boxes again and found an old audio 
transformer with COM-.5K-1K-1.5K ohms to COM-3.2-6/8 ohms that will do 
the job. It is a Sencore A-7947. Guess I should do a better search 
next time.

Thanks very much anyway for all the suggestions and I will archive it 
all for future reference.

Good luck and 73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Friday, February 12, 2010 8:13 PM
Subject: Re: [Boatanchors] audio transformer


> Maybe a small filament transformer:
>
> 8:600 is about 1:75 impedance ratio, so the turns ratio is SQR(75) =
> SQR(3) x 5 = 1.73 x 5 = about 8.2:1
>
> The turns ratio of a 12 V filament transformer is 120/12 = 10:1
>
> Close enough. I'd try something small like 12V @ .25 to 1.0 Amp.
>
> Best,
> -John
>
> ==============
>
>
>
>> 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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