Re: KX1 speaker output with superimposed oscillation

Posted by Francisco Barros on Sep 09, 2007; 9:41pm
URL: http://elecraft.85.s1.nabble.com/KX1-speaker-output-with-superimposed-oscillation-tp452289p452292.html

Hi Dave,

Thanks to you.
IHope Bob can tell us, with the modeling of the LM386, why this strange
behaviour.
>From the knowledge point of view, the technique "try and error" is not the
best way, we would like to know more... .
Now, my KX1, at the LM386's speaker output, pin 5, has the original RC
network (10 Ohm + 100 nF) to ground plus one 68 nF to ground also.
I even tried to put the 68 nF in parallel with the original 100 nF but it
did not worked. Neither with a value of 100 nF, so finally I installed the
68 nF capacitor directly to the output and ground, allways with short leads
(I learned this after several years working with RF techniques :)).

73,
Paco

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