Re: Switcher for Sega G80 games

Mark E Davidson wrote:

> Peter, Trust me.. There is a Power Good signal on my supply and it not
> a Computer power supply. It is also NOT a standard "game Supply ether
> as it costs 151.00 each!. What is a dallas/maxim reset circuit?

The "Dallas/Maxim" IC puts one pin to ground and the other to +5 and the
output signals when the power is in proper range. Your power-good
signal does much the same thing, but monitors more than just the +5.
 Forget the IC and use the power-good line. You might have to invert
it, though.

>
> peter jones wrote:
>
>>-----Original Message-----
>>From: Mark E Davidson <mark@basementarcade.com>
>>To: vectorlist@synthcom.com
>>Date: Mon, 23 Dec 2002 11:39:10 -0800
>>Subject: VECTOR: Switcher for Sega G80 games
>>
>>
>>
>>>Ok,
>>> I have started a batch of Sega G80 projects I have been putting off
>>>and now have a question.
>>>I need to put a switcher in my Star Trek. The amp part of the board is
>>>distorting horribly, 1/2 the frame that held the PS together is missing
>>>so the supply sits unmounted in the back of the game. The PS board is
>>>pretty hacked up form inexperience repairs and every thing I have read
>>>says that it is a good idea anyway.
>>>
>>>I have a great switcher i have made as my "standard" replacement for all
>>>games new or old, that has all the correct positive and negative
>>>voltages with more then enough amps. This supply also has a Power good
>>>line out as well. I do NOT want to maintain the original supply for that
>>>crappie 3v AC for the reset!
>>>
>>>
>>>
>>there is no 'power-good' signal on switchers, only on p.c. power supply's.
>>
>>dont bother, just use a dallas/maxim reset circuit.
>>they look just like a to92 transistor, vcc/gnd/reset simple!
>>cost about $1.
>>
>>c.u.
>>
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>>
>>
>

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