Re: Bulletproof your WG6100!

Jeff Hendrix wrote:
>
> Well Anders and I were a little worried about the cash layout to get these
> things made and if we would get stuck with piles of boards. Now we are
> beginning to wonder if we need to increase our order.
>
> These things are way cool, I had a monitor in my black widow that was
> giving me all kinds of trouble. I couldn't get the picture small enough to
> fit on the screen (I adjusted the size pots to min.), and the screen also
> had the shakes.
> Anders assembled the first one on a breadboard and I hooked it into my
> monitor, wedged a corner of the breadboard under the deflection pcb, and
> fired it up... and it worked.
> The screen was small (because I had the sizes turn all the way down) and
> was stable as a rock. He wipped out a few boards and I installed them in
> troubled monitors and they have worked flawlessly ever since.
> I had the opportunity to place 4 of my star wars machines in movie theatres
> last year and in the first 2 weeks, all the amplifone monitors went dead
> (which is to be expected), so I replaced them all with wells gardner
> monitors and slowly they started to die. Then I started replacing the low
> voltage section of deflection boards with LV2000s and they have been
> running solid ever since. (I still have 2 machines on location and they
> leave them running at night) So I have 2 that have been on for about a
> year, without rest, and they are humming along.
>
> If anyone wants to see what these things look like, there is a picture of
> one of the prototypes at
>
> www.spies.com/arcade/schematics/
> scroll down to the "Tempest LV regulator" section.
>
> the production boards look very similar, the placement of a few of the
> parts have been moved.
> The schematics are also up there if anybody is curious on how these things work.
>
> I should have the instruction manual for these done in a few days, I'll
> post a .pdf file of it we it gets closer.
> (It will be a few weeks to get assembly photos in it, because we need the
> boards to finish it)
>
> -jeff
>
> jeffh@diac.com
>
> Buy/Sell/Trade classic video arcade games.
> www.diac.com/~jeffh/

Hi, Jeff!
Took a look at your schematic, seems fine, but should there not be a
diode reverse biased across the voltage regulator input/output leads? To
protect the regulator from back voltage during shutdown.
John :-#)#

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