See! I told you Rodger was the expert here!! (At least that's what I
said on RGVAC)
-Zonn
On Fri, 15 Oct 1999 03:13:49 -0500, you wrote:
>Multiple windings in parallel is really no different than one heavier
>winding. But if you go the parallel route you may want to stick to
>something like quadrafiler wire so that all wires are the exact same
>length and couple into the core in exactly the same way. Otherwise
>you're going to get some really nasty effects like keystoning or
>excessively high drive currents due to parts of windings trying to
>fight each other.
>
>The way to make a deflection board that doesn't self destruct and
>still has high drawing speed it to use a stacked output arrangement
>where there is one set of transistors running from a fairly low
>voltage that can hold the beam in any given position with low
>dissipation and another set running from a higher voltage for
>high speed movements. The G08 is an example of what happens
>when you try doing both with only one set of transistors.
>
>Another possibility is to use FETs. Biasing can be a royal bitch,
>though. I had a circuit that used both bipolars and FETs in a
>cascode (or is it cascade, I can never get those right) arrangement
>where the FET dissipated most of the power and the bipolars
>didn't have to see excessive voltages. Looked like a winner for
>a G08 replacement board, but I sold off my games and have no
>money for development.
Received on Fri Oct 15 12:41:16 1999
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