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maestro
Registered: Mar 2004
Posts: 721 |
power packs
quick question if someone can help.
does an old bread bin power supply work with a newer 64c???
thanks |
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ready.
Registered: Feb 2003
Posts: 441 |
it works but is more stressed. C64c requires more current on the 5V line than old C64, which generates the second 5V line from the 9VAC inside the case.
So, better not use old power pack for C64c, or it might get hot and cause overvoltage problems and kill some ICs.
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maestro
Registered: Mar 2004
Posts: 721 |
thx |
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Mace
Registered: May 2002
Posts: 1799 |
But you can't see very well if it's a new case AND a new board, or just a new case, can you?
Some of the white C64s have a regular (with SID=6581) board, those should do as well with an old PSU as with a new one. |
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chatGPZ
Registered: Dec 2001
Posts: 11168 |
it doesnt really matter which of the power bricks you use, they are all rated the same, and they are all equally shit =) |
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Zyron
Registered: Jan 2002
Posts: 2381 |
I've used the old transformer with a new board for many many years without any problems. |
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bugjam
Registered: Apr 2003
Posts: 2519 |
Now I have a dumb question: if a faulty PS can kill the board with a power peak, what is the use of the internal fuse? Should it not protect the board in exactly this case? |
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ready.
Registered: Feb 2003
Posts: 441 |
the fuse protects your house, actually, preventing an overcurrent in case of power pack failure, otherwise it might cause fire.
Protecting the C64 board is another story, which the original power pack couldn't care less.
The C128 power pack is different regarding this, as it has a zener diode as a means of protection towards the computer board in case of overvoltage caused by the power pack. |
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bugjam
Registered: Apr 2003
Posts: 2519 |
Ah, thanks for the info! Would it be feasible to add this kind of protection between the PS and the computer? Would probably need too much tinkering, though... |
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ready.
Registered: Feb 2003
Posts: 441 |
actually that would be quite simple and effective, just to make sure the 5V line does not go over 5.5V.
It would be a small PCB with a female connector to plug in your power pack and a male connector to plug into you C64 and a zener + fuse in between.
Maybe an SCR device if you want a superfast voltage cut off.
gotta think about it some time, just like my project of a DIY heavy duty PSU. |
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bugjam
Registered: Apr 2003
Posts: 2519 |
Sounds good - actually there could be market for a small device to plug inbetween the PS and the computer, as getting a heavy duty PS means much more cost and effort, while at the same time there are plenty of the old power supplies around (I myself have like, dunno, 60 of them...). |
