Posted By
Jedi
on 2017-02-11
19:42:55
|  Tiny USB power supply
Hey folks,
I've just found this solution on the other day:
http://www.lemon64.com/forum/viewtopic.php?t=61160&postdays=0&postorder=asc&start=0
It uses a tiny monolithic voltage converter to double the +5V from the USB to +10 DC and feeds them to 9V AC and 5V DC lines. The whole thing fits into the original DIN plug. 
Would this work with the C+4? As I remember the C64 uses the 9V AC for TOD clocks only (?), but not sure about the C+4.
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Posted By
JamesC
on 2017-02-11
23:59:54
| Re: Tiny USB power supply
Electrically, yes it will work. Plus/4 and C64 power supplies are interchangeable, the DIN plug is the only difference.
However, there is no ground (earth) line in a USB cable, nor is there a ground in a typical USB wall adapter. So if anything in your Plus/4 shorts out, you risk losing more than just that one component. You could lose your CPU or your TED as well. 
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Posted By
Jakec
on 2017-02-15
04:35:54
| Re: Tiny USB power supply
The amps too little. Anyway, someone has already tried?
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Posted By
MMS
on 2017-02-28
10:59:13
 | Re: Tiny USB power supply
So I suppose it is closer to the C16 power supply. It also do not have a ground(earth) and low on amps.
Anyhow, for that any unregulated, ~1.5 Amps general PSU could be fine.
Actually I have one working Plus/4 from the 4, and this one fortunately has the same round connector, as my C64. So this solution may work with my Plus/4.
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Posted By
filker
on 2017-08-18
11:45:39
| Re: Tiny USB power supply
Yes, it works with Plus/4. I haven't tried RS232 capability yet though. I also had changed Plus/4's power socket.
It passed more than a year since I made this hack. No problem so far. It's also fine with a 2 amps powerbank.
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Posted By
MMS
on 2017-08-18
11:59:08
| Re: Tiny USB power supply
OK, so only one problem remains: from the hell we get that strange square connector?
(The round one (I have on 1 of 4 Plus/4) is a normal DIN connector with 7 pins you can get.)
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