Folks,
I made simulations on a "discrete version" of the SL611
(component values from the Plessey 1975 data book) using LTSPICE
and then upon success with teh simulaiton I also made a pcb
layout. There is also a discrete version of the SL621 as a layout
(I am using EASY PC). For unknown reasons I can not upload the pdf
files into my folder (DK5LVs stuff)
Can somebody advise how to upload?
Henning
DK5LV
Am 08.03.2017 um 21:33 schrieb William
Kimber:
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Somewhen in the past there was a version of the SL621 AGC
circuit made with individual transistors.? Try searching the
RSGB handbook or tech topics.
Cheers,
William
On 03/09/2017 08:38 AM, Doug - via
Groups.Io wrote:
Chuck,
? I am very interested in an AGC circuit for the BITX40. I
have already installed a new audio output amp - LM386 - that
works substantially better but on strong signals and a good
antenna there is distortion from some point onboard. Having to
ride the volume is a pain in the you know what. I was looking
at my radio-engineer handbook and one of the AGC circuits they
show uses the Plessy Sl621 AGC chip. I doubt it is still
available but if it was it would make things very simple.
Google it, the PDF data is still out there. This uses audio to
establish AGC that could be applied in some way to probably Q1
on the BITX board.
