Post by vmarcus on Mar 16, 2022 1:07:27 GMT
Well, I have recently acquired a vintage commodore B128-80 (low profile) with a 220-v power supply.
Since I’m here in the US, I would like to replace the PSU with a 110-v version. After seeking help from multiple computer repair shops in my area, with no luck, I decided replace the existing with ATX 24 pin PSU which fits nicely. From there I'm going with a (fused) ATX Power Supply Breakout Board.
As a newbie, here is my ignorance, as per handling the difference in amperage.
As per the overages in output amperage from the PSU, does the computer only pulls enough current as needed,
or should I limited the level of current?
2) -12v - PSU outputs 0.8A, the requirement is 0.3a
3) +12v - PSU outputs 15A, the requirement is 0.7a - should I use 1A fuse?
6) +5v - PSU outputs 15A, the B128 requires 5.5A, should I use max 10a fuse?
As per, the pin 1 - @50/60hz, I'll be using the TL494CN chip as wired, in the CBM 128 power supply
www.zimmers.net/anonftp/pub/cbm/schematics/computers/b/8256043-14of14.gif
Though, I suppose, the following works just the same using the 555 timer chip - houseofjeff.com/555-timer-os...om/555-timer-oscillator-frequency-calculator/
Yeah, I suppose, the moral of the story is, one should search existing threads for related issues.
I tried, but wound having more questions than answers, since I have no background in electrical engineering.
Yeah, I realize, some time ago, someone attempt with a c128 - c-128.freeforums.net/thread/400/c128d-woes
And, as per B128 power supplies, I found this link:
forum.vcfed.org/index.php?threads/commodore-b128-c610.66228/
Since I’m here in the US, I would like to replace the PSU with a 110-v version. After seeking help from multiple computer repair shops in my area, with no luck, I decided replace the existing with ATX 24 pin PSU which fits nicely. From there I'm going with a (fused) ATX Power Supply Breakout Board.
As a newbie, here is my ignorance, as per handling the difference in amperage.
As per the overages in output amperage from the PSU, does the computer only pulls enough current as needed,
or should I limited the level of current?
2) -12v - PSU outputs 0.8A, the requirement is 0.3a
3) +12v - PSU outputs 15A, the requirement is 0.7a - should I use 1A fuse?
6) +5v - PSU outputs 15A, the B128 requires 5.5A, should I use max 10a fuse?
As per, the pin 1 - @50/60hz, I'll be using the TL494CN chip as wired, in the CBM 128 power supply
www.zimmers.net/anonftp/pub/cbm/schematics/computers/b/8256043-14of14.gif
Though, I suppose, the following works just the same using the 555 timer chip - houseofjeff.com/555-timer-os...om/555-timer-oscillator-frequency-calculator/
Yeah, I suppose, the moral of the story is, one should search existing threads for related issues.
I tried, but wound having more questions than answers, since I have no background in electrical engineering.
Yeah, I realize, some time ago, someone attempt with a c128 - c-128.freeforums.net/thread/400/c128d-woes
And, as per B128 power supplies, I found this link:
forum.vcfed.org/index.php?threads/commodore-b128-c610.66228/
