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Date Posted: 20:03:22 12/13/01 Thu
Author: lcs
Subject: Re: Instability - test it first
In reply to: vg 's message, "Re: Instability on scrambled channels" on 14:52:00 12/13/01 Thu


Beware of this mod. I got lots of trouble
when i tried changing those 1k resistors
to 4k7. It messed up the board. Canton 4.2
already has too much gain. I used only
the specified components and my problems
were solved when i undid the mod. and
added a pot to decrease the amplitude of
the video input.

lcs

>>Just an additional note on the subject: I was able to
>>easily solve the stability problems that I was having
>>with the Canton 4.2 circuit by modifying the edge
>>detectors. I don't have the stuff in front of me
>>right now, but all you really have to do is change two
>>resistor values to make the edge detectors more
>>sensitive. Most of the boards have a similar
>>edge-detector design. If someone else here still has
>>the info from one of my previous posts, please pass it
>>on, otherwise I'll go through my notes and post it
>>again.
>>
>>I've been away from the forum for a while but the AGC
>>sampling circuit looks really cool, maybe we can get
>>Sakman to do one of his killer layouts for us (hint
>>hint). >8]
>>
>>- Phil

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