Gain enhancement

[Steve Smith]

email from Peter VK3YE to Phil VK5SRP :

"Thanks Phil, I agree it could do with a wee bit more gain, though my
instinct on a band like 7 MHz is to try more audio gain before adding RF
gain.

The LM386 has some tricks that can give it even more gain. A detailed
article is at

http://www.wentztech.com/radio/resources/Technical-Info/_LM386/Unleash-lm386.pdf

This doesn't use the usual capacitor between pins 1 & 8 but does have a
few other bits. I've had good success with it.

Another thing worth pursuing is rx muting as my rig has a horrible clunk
and feedback. A possibility is a FET switch on the AF amp input, though
the above refers to a possible use of Pin 7.

73, Peter VK3YE"

[Eric Söderman]

Hi.

Here is a blog post from the author:

http://la3za.blogspot.se/2003/08/unleashing-lm386.html

Might give some more.

Eric SA5BKE

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