[Elecraft] KX1 low audio fix?

Phil Wheeler [email protected]
Thu Dec 4 20:02:06 2003


Make sure your earbuds are rated at 108 dB/mW.  Some are not and it 
makes quite a differnce.  Been there!

Phil

[email protected] wrote:

>Gave it a quick try. New starting values: 220 ohms and 33 uF. Ups the audio quite a bit. It oscillates with the R below 100 ohms, so it is marginal. It needs some playing with, perhaps with the 10 uF removed from pin 1-8. Good luck.
>
>    Dave WX7G
>
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]]On Behalf Of drcuthbert
>Sent: Thursday, December 04, 2003 10:42 AM
>To: [email protected]
>Subject: [Elecraft] KX1 low audio fix?
>
>
>I did some testing on my KX1 and the audio level could be improved with more gain between the RF input and the audio output. But, the LM386 is already set to a gain of 200. I haven't tried this yet and perhaps one of you can try it before I have time to do it. The gain can be further increased by connecting a series R and C from pin 1 to ground. A starting place is 15 ohms at pin 1 connected to a 100uF cap to ground. The negative terminal of the cap connects to ground. This should up the gain to 2000 (and maybe make is oscillate nicely).
>
>Alternatively, the 10 uF cap from pin 1 to 8 can be removed before trying the mod.
>
>   Dave WX7G
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