Re: K3 Caution when using an external monaural speaker
Posted by
David Pratt on
Jan 14, 2009; 9:09pm
URL: http://elecraft.85.s1.nabble.com/K3-Caution-when-using-an-external-monaural-speaker-tp1680829p2159164.html
In a recent message, wayne burdick <
[hidden email]> wrote ...
>The short version is: put 1/8-W (or larger), 470-ohm resistors from
>each speaker output to ground. (The actual value isn't critical;
>anything from 330 to 1000 ohms would probably work just as well.) This
>can be done conveniently on the KIO3's audio daughter board, at its
>single-row, right-angle male connector.
I see that the AF mod application note at
http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_A.pdfis somewhat different to what you describe, Wayne. The 470 ohm
resistors appear to be in different places of the circuit. Does this
come to the same thing, or are the two resistors from each speaker
output to ground also necessary?
73
--
David G4DMP
Leeds, England, UK
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