MiniC64PSU

[Pyrofer]

I run my 64c off a 5v/12v PSU without issue. If you want to replicate the AC part you can put a 555 or crystal oscillator inside the 64 (a known circuit that works well). The other option is to modulate the 12v input with a FET which I think should work but have not tested yet.
I bought a Transformer off eBay that had dual 9vac outputs and put a 5v dc2dc module on it (along with a rectifier and cap to smooth the input) and run my C128 off that without problems. As long as you get a decent 5v supply that is powerful enough there shouldn't be many problems.
If you can get into an old original PSU and replace the 7805 with a modern DC2DC there isn't much else to do.

 

[iainjh]

hi, thx for the info and your example there. ta!

I posted about this over at lemon64, it wont give me a link but under help and support its near the top right now, with a few comments.

I also found this for ref:

http://www.lemon64.com/forum/viewtopic.php?t=61160

anyway I left it on since 8am running and all is stlil working and cool.

 

[motrucker]

I wouldn't use this setup on my computer. Thankfully I have a 1764 PSU in great condition.
I do hope any one considering this idea will check to see which motherboard your C64c has. My C-64c has the same old long board that was used in breadbins. Don't just assume your c has a short board.

 

[Charlie]

I wouldn't use this setup on my computer. Thankfully I have a 1764 PSU in great condition.
I do hope any one considering this idea will check to see which motherboard your C64c has. My C-64c has the same old long board that was used in breadbins. Don't just assume your c has a short board.

Each to their own...
Electrically there's nothing wrong with this device beyond the 'gotchas' I think have already been mentioned. I'm pretty sure anyone with the ability to make one of these will know what kind of C=64 they have. I simply present another PSU solution - interesting that iainjh found someone else who's done this. I guess there's nothing new under the Sun, and seemingly no reports from people who have actually tried and broken their C=64s!

 

[iainjh]

I'm still v pleased with it and far better than an old c64 time bomb psu

ta!

 

[Charlie]

I realise this 'design' for a replacement C=64 PSU was about as popular as a dose of herpes but as I've made some more of these MiniC64PSU's on request I thought I'd post an update with a few piccies to go along with my instructions further up the thread in case anyone should be interested in making their own.

MAX660 butchered and Capacitors Soldered
​

Attached to USB Cable
Ready for DIN Plug

​

Thoughts:
-Every one made over the last year-or-so has been 100% reliable
-There have been no reported cases of any problems with any C=64
-My C=64 runs a few upgrades, and a full size synth keyboard, without any power issues
-Really best suited to a 'short board' C=64 as a 'long board' may indeed draw too much power
-The only known comparability issue is where software makes use of the C=64's clock; it requires AC to run

I'm probably going to post a 'how to' thread for making a more traditional replacement C=64 PSU shortly, but for now I can honestly say for anyone with a 'short board' C=64 who doesn't need a clock this design is:
-Easy and cheep to make
-Very compact
-One hell of a lot safer than running a C=64 with an original 'time bomb' PSU