Panasonic FS-A1GT power supply

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By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 16:56

Sorry for another topic.

I know TurboR uses: +12V, -12V and +5V.

I also know the input is: 100V AC (+/- 10%) @ 50/60Hz and 22W (on GT).

Well, I want to build an internal Automatic (or universal) Power Supply on GT, for that I just need to know what is the amperage used on each voltage (+12V, -12V and +5V) ?

So far I have found to be:

+12V @ 500mA
-12V @ 500mA (seems too high to me)
+5V @ 100mA (or 1.5A ?!)

Someone here have those datas ?

I know I could just use a simple 220V > 100V or 110/127V > 100V, but I really don't like that solution.

Note: I don't have a GT yet, but I do like to do my projects well ahead of time. Otherwise, I would just get that information with a simple ammeter.

Thanks,
Fernando

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By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 19:33

Okay, looking at standard floppy disk drive I can see it can go as high as 1A, so +5V must be 1.5A.

The question now is -12V part, I guess 500mA is safe, but still looks kinda high to me (for a ~30W power supply).

Also, someone here knows what is the space free left (dimmensions in mm) on transformer inside on GT (by taking out the original transformer) ?

I need that information so I can choose which power supply I can use w/o mistakes.

Fernando

By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 20:07

This is the power supply I'm planning to put inside:
i48.tinypic.com/2upg0af.png

It's small, the photo makes appear bigger.

I removed the references just in case.

By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 20:51

Here is a FS-A1ST area, look the transformer at left:
i49.tinypic.com/1060snc.png

Power Supply area (w/o keyboard):
i48.tinypic.com/20htt12.png

And finally the area (in red) to work with:
i46.tinypic.com/1zr1dlz.png

Too bad the last photo was taking with angle, so I cannot calc the area.

What is the battery type Turbo R uses? D or C? How long it last?

If is a C type I'll have no problem to put it inside.

By Jipe

Paragon (1366)

Jipe's picture

15-02-2010, 20:55

if you don't use in Japan or USA you can just replace the transformer 100v / 15V - 15V by a 220v / 15v - 15v

By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 21:18

if you don't use in Japan or USA you can just replace the transformer 100v / 15V - 15V by a 220v / 15v - 15v

Looking at Service Manual (FS-A1GT) it says: +12V, -12V and +5V DC, not +15 and -15V.

It has a triple output, not dual (according to SM).

By Jipe

Paragon (1366)

Jipe's picture

15-02-2010, 21:31

the 15v is not for D.C. current but A.C. alternatif current

is not +15v -15v but 220V / 2 x 15v A.C. with midle point

sorry for the - separator ( confuse it )

link for picture of tranformer

http://www.conrad.fr/wcsstore/ConradImages/PRODUITS/1055176_p_g.jpg

By Gradius2

Hero (574)

Gradius2's picture

15-02-2010, 21:48

Well, this just got a lot more confuse then, since on SM says 100V AC input and outputs +12V, -12V and +5V DC. BA-team

Guess I'll get a GT first and makes the measures personally (but it will takes months).

By dhau

Paragon (1557)

dhau's picture

16-02-2010, 14:17

Dude, don't you know your power supplies? Transformer supplies 15 AC voltage from each secondary coil. Then current goes through rectifier, RC filter and your standard fare 7805/7812/7912 stabilizers. You got service manual, it's all there. You don't need to worry about converting AC to DC, just get a suitable transformer, like Jipe said.

By Gradius2

Hero (574)

Gradius2's picture

16-02-2010, 15:25

Dude, don't you know your power supplies? Transformer supplies 15 AC voltage from each secondary coil. Then current goes through rectifier, RC filter and your standard fare 7805/7812/7912 stabilizers. You got service manual, it's all there. You don't need to worry about converting AC to DC, just get a suitable transformer, like Jipe said.

I know those "almost the same" 7805/7812/7912 are there, but it talks nothing about 15 AC.

Like I said before, I have no Turbo R with me, so I couldn't get any real measure, not until I get one.

Btw, what amperage (15VAC) is good enough ?

The more amperage, bigger is the thing, and gets expensive too.

If is just 100VAC > 15VAC x 2, then it just got a lot more easier.

By Gradius2

Hero (574)

Gradius2's picture

16-02-2010, 16:34

Possible values are:

A = W/V

A = 22/100, so A = 220mA

Now, lets supose 30W as max, so A would be 300mA (100VAC @ 300mA).

Pretty low indeed.

I have found this puppy, guess is more than enough:
www.hayonik.com.br/fotos/transformadores/trafo_series.jpg

Works under 127 or 220VAC @ 1.4A (necessary a simple switcher), output 2x15VAC, 42 Watts.

Dimensions:
www.hayonik.com.br/fotos/transformadores/trafo_series3.jpg

A=89 mm
B=83 mm
C=67 mm
D=54 mm
E=107 mm

Weight: 1.09Kg (ouch!) or 2.40 pounds.
Price: US$ 19.50

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