[Elecraft] KX1 low audio fix?

Thu Dec 4 13:03:01 2003

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
_______________________________________________
Elecraft mailing list: [email protected]
You must be subscribed to post to the list.
To subscribe or unsubscribe see: =
http://mailman.qth.net/mailman/listinfo/elecraft
Elecraft Web Page: http://www.elecraft.com
Also see: http://www.elecraft.com/elecraft_list_guidelines.htm