I'm selling now one of them on eBay:
http://cgi.ebay.at/ws/eBayISAPI.dll?ViewItemitem=110814185854
LCD
Am 14.01.2012 18:48, schrieb Thomas Harte:
You should sell those; some of us are pathologically incapable of
soldering but would love a quiet power supply.
On 14 January 2012 09:39, Leszek
:1000uF | --
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0v
I put my photos here: http://www.keprt.cz/sam/psu.php
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Od: nev young
Komu:
Datum: 15.01.2012 13:52
Předmět: Re: Power supply circuit
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Od: Colin Piggot
Komu:
Datum: 14.01.2012 19:15
Předmět: Re: Power supply circuit diagram
Aley Keprt wrote:
So I just need to know what was the original piece in the PSU and I am
going to replace it back.
For the 12V Zener Diode - I use 1N5349B
Aley wrote:
You can clearly see that D4 is missing (right-bottom), and there is a very
large old zener diode put there instead. It is Tesla 6NZ70 - 12V 1.5W
Zener
diode which proudes a LOT of heat. (If I count correctly, a 2.5W diode
should be used instead.)
That's not the standard part...
to limit maximum
current on 12V line (i.e. something like a cheap reversible fuse)?
Aley
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Od: Colin Piggot
Komu:
Datum: 15.01.2012 10:52
Předmět: Re: Power supply circuit diagram
Aley wrote:
You can clearly see that D4 is missing
On 15/01/12 10:52, Aley Keprt wrote:
Colin, thank you very much!!!
Also I always wondered why there is a zener diode (I never saw this kind
of computer power supply) instead of IO 7812.
It's a cheap and nasty way of getting 12v.
And technically, why there is that R1 resistor? Is its purpose
No, but my PSU was very loud after few minutes, so I adopted a normal
+5V/2A +12V/2A PSU by soldering the SAM PSU connector to it. Works
excellent!
In the manual they state which pins are GND, +5V and +12V, so it is very
easy and modern PSU are smaller and stronger.
LCD
2012/1/14 Aley Keprt
You should sell those; some of us are pathologically incapable of
soldering but would love a quiet power supply.
On 14 January 2012 09:39, Leszek Chmielewski retr...@gmail.com wrote:
No, but my PSU was very loud after few minutes, so I adopted a normal
+5V/2A +12V/2A PSU by soldering the SAM
Aley Keprt wrote:
So I just need to know what was the original piece in the PSU and I am
going to replace it back.
For the 12V Zener Diode - I use 1N5349B when repairing old supplies. I would
also recommend replacing the wirewound resistor by it with a higher wattage
part - often see them
Okay, I will build and sell some of them. It was easier to make than
repairing a 1230/28 Turbo-Card for my Amiga 1200...
Am 14.01.2012 18:48, schrieb Thomas Harte:
You should sell those; some of us are pathologically incapable of
soldering but would love a quiet power supply.
On 14 January
Quoting Colin Piggot qua...@clara.net:
I can supply switch mode power supplies with a little adapter cable to
plug into the SAM if needed. I also add a big capacitor to the 5v line
in my adapter cable as there can be a bit of noise on the output from
the switch mode power supplies.
Colin
=
Hi guys, does anybody have the original Sam Coupe power supply unit circuit
diagram?
My power supply was damaged years ago and somebody repaired it by replacing
something inside with an old big zener diode. I just remember that 12V line was
dead and that diode is just a random one which we
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