Hi Al!
The circuit that I have seen used favorably (like when a hard short
develops in the pass transistor) is the one used by Gottlieb in their
pinball games. As simple little circuit, using a SCR, zener diode, a couple
of resistors and a bypass cap.
This can handle quite high currents, the SCR is a C106B. If anyone wants
the circuit I'll post it on my page or email it, a tiny jpeg of it should
be about 5 or so K in size.
At 03:45 PM 9/4/1999 -0500, you wrote:
>I've got a largish pile of dead, comatose and wounded AR2 boards and I'd
>like to get at least two running (for a Space Duel and a Millipede)
>
>I want to get a couple running and have some spares for later.
>
>What are some common failure modes for AR2 boards besides a toasted sense
>resistor?
>
>Should I use a big resistor on the outputs of the 5v line or hook up a
>Cinemat system board so I don't fry anything good?
>
>I would like to add a crowbar diode to the 5v line so I never have to
>worry about the linear going postal.
>
>Where can I get one?
>
>What type should I get (current rating, etc)?
>
>Should I mount it on the gameboard, harness or on the AR2? I'm partial to
>the harness since this doesn't deface the gameboard and you don't have to
>consider the harness voltage drop. Comments?
>
>Lastly, does anybody live in Denver? I won a contest and I'm flying out
>to the Bonnie Raitt show at Red Rocks on the weekend of the 11th. I won't
>have the tixs until Tuesday so I don't know how much free time I will
>have but I'd love to meet another collector if I can fit it in.
>
>Virtu-Al
>
>___________________________________________________________________
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Received on Sun Sep 5 00:12:46 1999
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