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tony
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Re:technical about power requirements
« on: May 13, 2008, 07:31AM »
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thanks for the input guys, I'll set it at 9vdc
regards, tony
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sderyke2002
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Re:technical about power requirements
« Reply #1 on: May 12, 2008, 06:23PM »
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I agree with Robert and actually feel the .5 volt overage would put less stress on the circuitry than the under voltage you are using.
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Robert Weck
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Re:technical about power requirements
« Reply #2 on: May 12, 2008, 11:02AM »
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Quote from: tony on May 12, 2008, 05:41AM   

what you say makes sense. here's what I ended up doing. my computer takes 4aa's or 8.5vdc adapt. which I cannot find. I have a multiple output adapt. and the comp. will operate ok starting at 6vdc. out puts are 6,7.5,and 9. I chose 7.5 as a midway point and all seems ok. its a volt lower than specifyed, but i thought thats better than a 1/2 volt over. do you think i made the right choice???    regards, tony

A voltage regulator (e.g. the LM7809, which is used in many chess computers) is specified for up to 35V input voltage; but it would surely become rather hot (and i would not go that far)

A grown-up voltage regulator would just laugh about that 0,5V more... 


Robert
« Last Edit: May 12, 2008, 02:45PM by Robert Weck » Report to moderator Logged
tony
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Re:technical about power requirements
« Reply #3 on: May 12, 2008, 05:41AM »
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what you say makes sense. here's what I ended up doing. my computer takes 4aa's or 8.5vdc adapt. which I cannot find. I have a multiple output adapt. and the comp. will operate ok starting at 6vdc. out puts are 6,7.5,and 9. I chose 7.5 as a midway point and all seems ok. its a volt lower than specifyed, but i thought thats better than a 1/2 volt over. do you think i made the right choice???    regards, tony
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sderyke2002
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Re:technical about power requirements
« Reply #4 on: May 8, 2008, 03:23PM »
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Quote from: tony on May  8, 2008, 03:36AM   

but that still doesn't explain how some computers use 6 volts of batteries and 9 voltadapters. would just these types tolerate the 6 to 9 spread?  tony


Yes, it is possible that the voltage regulator has a chip and surround circuitry which can tolerate such differences; but another possibility is that the nine volts comes in through an additional amount of circuitry which the 6 volts from the batteries does not go through and thus it would not work properly with an AC adapter that generated only 6 volts DC.  That is why I said you really have to know the circuit design to be sure.
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tony
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Re:technical about power requirements
« Reply #5 on: May 8, 2008, 03:36AM »
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but that still doesn't explain how some computers use 6 volts of batteries and 9 voltadapters. would just these types tolerate the 6 to 9 spread?  tony
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sderyke2002
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Re:technical about power requirements
« Reply #6 on: May 6, 2008, 06:06PM »
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Almost all TTL (Transistor - Transistor Logic) and IC (Integrated Circuit) Chips operate on 5 volts with of course some lee way. 

They achieve this through a power supply regulator and filter which relies on being provided more than sufficient voltage levels and then stepping it down to the potential desired. 

So since both 6 volts and 9 volts is above this level it can be used to drive the circuitry of the board.  The difference is in the design of the regulator and filter in the power supply.  Because of these differences I would not assume that you could plug a 6 volt power cord into a machine expecting a 9 volt supply.  It might work briefly, but it might generate extra heat as it worked hard to maintain the voltage level needed.  You really need to look at the design of the power supply to know for sure.
« Last Edit: May 6, 2008, 06:08PM by sderyke2002 » Report to moderator Logged
tony
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technical about power requirements
« Reply #7 on: May 6, 2008, 08:29AM »
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i hope someone with more tech. experience can answer this.  some computers use 4 AA's = 6vdc. yet you have to use a 9 vdc adapt. ( ex. Star Diamond ) some computers use 6 AA's or C's = 9vdc and you use a 9vdc adapt. ( ex. Obsidian ) I get the feeling that most of the computers will run OK using 6 to 9 vdc adapter if they have from 4 to 6  1.5 volt batteries. am i right , or am i missing something?    regards, tony
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