On 23 Dec 2006 05:46:50 -0800, "Telstar Electronics"
wrote in
om:

Frank Gilliland wrote:
I've had it in my files since the chip first came out. Studied it
several times. Even used the chip in a couple designs.


It
faithfully reproduces an audio sinewave... but has an AGC.


Any linear amplifier will "reproduce" a sinewave. If it has AGC then
how "faithfully" that sinewave is reproduced depends on the time
constant of the AGC loop.


The harmonic
dostortion is less than 1% according to the spec.


That's for a 1kHz sinewave with 1:1 (no) compression. That's pretty
crappy even for a CB, and proves that -you- didn't read the complete
datasheet. For comparison, look at the specs of the CA3080.


So far, my new design
is working well... and has constant audio punch level... no matter if
you whisper or yell into the mic Exactly what is needed!


If that's the case then you set the feedback time constant too slow
and built yourself a CVA, not a compressor. Look at the scope and you
will see spikes.


With the fast
attack/release of the noise gate feature.. this chip is fantastic at
blocking ambient background noise!


Yes, it works very well at blocking signals. So does a switch. The
problems start when it begins -passing- signals. Didn't I tell you to
do your research?

Well... it seems you are much smarter than the engineers at Analog
Devices... LOL


Maybe. Maybe not. But I'm definitely smarter than you. I understand
how the chip works and its intended purpose, which is not the same as
the objective of your hacked design -- to increase the talk-power of a
CB radio.


They could sure use someone like you. Why don't you send them your
resume?


Why don't you spend some time and effort to learn about this stuff so
you can build something good instead of hacking other people's designs
and hoping they sell?