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From: troyc on 30 Mar 2006 10:16
Hello,

Who supplies (or what would be an acceptable substitution for) the
3052P regulator in this power supply:

http://personalpages.tds.net/~rcarlsen/images/c64ps.jpg

I haven't found a supplier for that part - unless I'm not looking in
the right place. From what I've read, I am assuming that the 7805
5-volt regulator sold by Radio Shack won't handle the current needed by
the C64 & accessories.

Thanks,
Troy

From: "FeMaster" <FeMaster @ hotmail . on 30 Mar 2006 10:48
"troyc" <troyc71(a)yahoo.com> wrote in message
news:1143731792.107095.154910(a)v46g2000cwv.googlegroups.com...
> Hello,
>
> Who supplies (or what would be an acceptable substitution for) the
> 3052P regulator in this power supply:
>
> http://personalpages.tds.net/~rcarlsen/images/c64ps.jpg
>
> I haven't found a supplier for that part - unless I'm not looking in
> the right place. From what I've read, I am assuming that the 7805
> 5-volt regulator sold by Radio Shack won't handle the current needed by
> the C64 & accessories.
>


They really don't seem to be _that_ hard to find... First entry on Google
search gave me this link:
http://froogle.google.com/froogle?q=3052p+regulator&hl=en&lr=&safe=off&rls=GGLG,GGLG:2005-36,GGLG:en&sa=N&tab=ff&sa=X&oi=froogle&ct=title

You're going to have to copy and paste it, as I know for sure that it's
going to wrap...

Another, here, http://www.pacificsemi.com/PartsList_14.htm and type in
"si-3052" in the search box at the top... Fairly cheap compared to the
first site.

Your best bet from what I see is to search for a "si-3052p", not just
"3052p"...

Good luck!


From: troyc on 30 Mar 2006 11:56
The way I read their site, the first site doesn't ship overseas for
orders under 500 EUR. Since I am in the US, that won't work out. The
second site (and all the others I've looked at) are wholesalers that
require minimum orders. I can buy at least a couple spare power
supplies on Ebay for the minimum order requirements. I just thought
that there might be a suitable substitution available through
Jameco/Radio Shack or some outlet like that. I'll find one
eventually... :-)
Thanks for the help,
Troy

From: bogax on 30 Mar 2006 12:52
troyc wrote:
> Hello,
>
> Who supplies (or what would be an acceptable substitution for) the
> 3052P regulator in this power supply:
>
> http://personalpages.tds.net/~rcarlsen/images/c64ps.jpg
>
> I haven't found a supplier for that part - unless I'm not looking in
> the right place. From what I've read, I am assuming that the 7805
> 5-volt regulator sold by Radio Shack won't handle the current needed by
> the C64 & accessories.
>
> Thanks,
> Troy

Add a pass transistor

http://www.fairchildsemi.com/ds/LM%2FLM7805E.pdf

page 21

From: a7yvm109gf5d1 on 30 Mar 2006 12:57
This is not the stock C= supply, right?
The 64 should draw about 1A from the 5V. The TO-200 7805 can handle
that current, it then becomes a question of how hot it becomes before
it shuts itself off. The answer is "quite hot" if you work out some
rudimentary numbers. A 9VAC fully rectified should give about 11.5V
peak. That regulator will dissipate quite a lot.
One interesting thing to note is that the DIN connector on the 64 is
rated for 2A max per contact.
I see the current is specced at 1.5A on your drawing. The 7805 won't
supply that reliably. I also don't see what the 30 ohm resistor is
doing on the ground lead, almost looks like they are trying to tweak
the output voltage and lose some regulation in the bargain.
You might want to try a regulator in a TO3 case. The all-metal case can
dissipate more heat by itself.
You can also try the LM317 adjustable regulator, but then you need to
add two resistors.
You can try some of the integrated switching modules with a wide input,
such as the TI PT5101A or PTH08000 family.. As a switcher, it will
dissipate far, far less waste heat and work very reliably.
http://focus.ti.com/docs/prod/folders/print/pt5101.html
http://focus.ti.com/lit/ds/symlink/pth08000w.pdf
You can even get a free sample from TI. The 5101 has a 1A limit, but is
easier to solder IMO. The PTH series has a tendency to fall apart by
itself if you're not careful. Also it needs a carefully placed
resistor.
email me I might have an old linear part lying around for you for free.

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