Re: Significantly drop G2/brightness (4600 raster hack)?

Gregg Woodcock wrote:

>----- Original Message -----
>From: "Rodger Boots" <rlboots@cedar-rapids.net>
>To: <vectorlist@synthcom.com>
>Sent: Thursday, November 07, 2002 12:55 AM
>Subject: Re: VECTOR: Significantly drop G2/brightness (4600 raster hack)?
>
>
>
>
>>Gregg Woodcock wrote:
>>
>>
>>
>>>The first raster hack I did was NO PROBLEMO! But these last 2 have the
>>>unusual problem that the brightness is WAY, WAY too high. It is not the
>>>case of a bad brightness pot because I can see a definite change when it
>>>
>>>
>is
>
>
>>>used. It is just that the range is way too high. I tried adding in
>>>
>>>
>almost
>
>
>>>1MOhm in series with the G2 connection to the picture tube and it was
>>>
>>>
>still
>
>
>>>dazzlingly bright. Is there a good way to drop the G2 somewhere before
>>>
>>>
>it
>
>
>>>gets ramped up (i.e. low voltage and low resistor)? John, is there
>>>something I may have forgotten that I did the first time that I'm not
>>>
>>>
>doing
>
>
>>>on these last 2?
>>>
>>>
>>>
>>>
>>>
>>Instead of putting the 1 megohm in series with the G2 line try
>>connecting it from the G2 line to ground.
>>
>>
>
>I don't get it. I figured G2 was voltage dependent. You are telling me it
>is current dependent and that I should bleed off current through a parallel
>connection to ground? That doesn't seem to make sense to me! Would either
>you or John please explain this before I put it into action?
>
>
>
G2 IS voltage dependent, but the 1 Mohm from G2 to ground would put a
load on the G2 output of the flyback and cause the voltage to be lower
and the brightness to reduce. It might very well get you to the
brightness levels you need without damaging the flyback (it's a load,
but not much of one).

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