D1303 transistor data needed

M

Mjolinor

Guest
Trying to mend a portable DVD player and there are several transistors up
the spout. I suspect someone has given it more than the recommended supply
voltage (4.5 V)

There are two identical transistors D1303 and one is short across the two
outside legs both ways, open elsewhere and the other is one volt drop centre
to one outside and open elsewhere. One is obviously goosed but I can't find
out if it is a FET or bi-polar or anything about it. Any help here please.
 
Mjolinor schrieb:
....
There are two identical transistors D1303 and one is short across the two
outside legs both ways, open elsewhere and the other is one volt drop centre
to one outside and open elsewhere. One is obviously goosed but I can't find
out if it is a FET or bi-polar or anything about it. Any help here please.
Click to expand...
"Your" 2SD1303 seems to be a bipolar transistor. Have a look at

http://homepage3.nifty.com/ebina2540/data/2SD/2SD1301-1400.htm
Click to expand...
HTH

Reinhard
 
"Reinhard Zwirner" <reinhard_zwirner@web.de> wrote in message
news:2gfgeuF1br7hU1@uni-berlin.de...
Mjolinor schrieb:

...
There are two identical transistors D1303 and one is short across the
two
outside legs both ways, open elsewhere and the other is one volt drop
centre
to one outside and open elsewhere. One is obviously goosed but I can't
find
out if it is a FET or bi-polar or anything about it. Any help here
please.

"Your" 2SD1303 seems to be a bipolar transistor. Have a look at

http://homepage3.nifty.com/ebina2540/data/2SD/2SD1301-1400.htm

HTH

Reinhard
Click to expand...
Thanks for that but (there is allways a but) while looking for this I found
the page you posted and I found

http://www.americanmicrosemi.com/products/specs/D1303.phtml

which suggests it is also an FET.

Hence the post :)

I sort of sketched out the circuit, a task I truly despise because if I do
it five times I get five different circuits, but I think I am concluding
bipolar NPN. I would appreciate some conclusive evidence for sure.
 
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:KNEoc.16$r14.0@newsfe5-gui.server.ntli.net...
Thanks for that but (there is allways a but) while looking for this I
found
the page you posted and I found

http://www.americanmicrosemi.com/products/specs/D1303.phtml

which suggests it is also an FET.
Click to expand...
Does the part have a manufacturers name or trade mark printed on it?
Japanese transistors are usually marked with the "2S" missing. For example,
a 2SA419 would usually be marked as "A419" on the component.

My old Towers transistor book does not list a 2SD1303, but my Towers FET
book does list a D1303...
N channel, depletion mode, Junction FET.
VDS: 25v.
Id: 15mA.
Ptot: 0.4W
Replacements: BFW13, 2N3686.

From the drawing, it looks like the D1303 FET uses a small round metal case.
Japanese 2SD transistors more commonly use plastic or TO3 style
packages.
 
"L. Fiar" <_@_._> wrote in message news:40a46ec3.0@entanet...
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:KNEoc.16$r14.0@newsfe5-gui.server.ntli.net...

Thanks for that but (there is allways a but) while looking for this I
found
the page you posted and I found

http://www.americanmicrosemi.com/products/specs/D1303.phtml

which suggests it is also an FET.

Does the part have a manufacturers name or trade mark printed on it?
Japanese transistors are usually marked with the "2S" missing. For
example,
a 2SA419 would usually be marked as "A419" on the component.

My old Towers transistor book does not list a 2SD1303, but my Towers FET
book does list a D1303...
N channel, depletion mode, Junction FET.
VDS: 25v.
Id: 15mA.
Ptot: 0.4W
Replacements: BFW13, 2N3686.

From the drawing, it looks like the D1303 FET uses a small round metal
case.
Japanese 2SD transistors more commonly use plastic or TO3 style
packages.

There are no other markings at all other than D1303. It's a plastic
Click to expand...
trapesium shape. I concluded NPN because all the biasing / signal resistors
are <200 ohm and I thought they would be much higher if it were a FET but
what the hell so I know about such things :)
 
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:zy%oc.4$%P6.2@newsfe1-win...
There are no other markings at all other than D1303. It's a plastic
trapesium shape. I concluded NPN because all the biasing / signal
resistors
are <200 ohm and I thought they would be much higher if it were a FET but
what the hell so I know about such things :)
Click to expand...

OK, I finally got off my fatass, searched out my old database and
re-installed it on one of the other systems.

A search for "D1303" brings up a 2SD1303:
Plastic package, TO92.
Looking at the flat side...
_________
| |
| |
| 2SD1303 |
| |
|_________|
| | |
| | |
e c b

NPN, 60v, 2Amp, 1Watt.
Suggested equiv. 2SD1207

That's all it says about it, does it sound like what you have there?
 
"L. Fiar" <_@_._> wrote in message news:40a7ee1c.0@entanet...
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:zy%oc.4$%P6.2@newsfe1-win...

There are no other markings at all other than D1303. It's a plastic
trapesium shape. I concluded NPN because all the biasing / signal
resistors
are <200 ohm and I thought they would be much higher if it were a FET
but
what the hell so I know about such things :)


OK, I finally got off my fatass, searched out my old database and
re-installed it on one of the other systems.

A search for "D1303" brings up a 2SD1303:
Plastic package, TO92.
Looking at the flat side...
_________
| |
| |
| 2SD1303 |
| |
|_________|
| | |
| | |
e c b

NPN, 60v, 2Amp, 1Watt.
Suggested equiv. 2SD1207

That's all it says about it, does it sound like what you have there?
Click to expand...
Maybe :)

I stuck two same number NPNs in and got the scope out.

What I have is a two transistor configuration. The device will run from
either 2 X 1.5V batteries or a 4.5 V power brick. This goes through a small
ferrite transformer to the centre leg of one transistor (emitter?), one
outside leg is grounded (collector?) and the other outside leg (base?) is
fed from a big, square, multi leg thing out of which comes a square wave
when you press "on". This makes the transistor middle leg (emitter) have a
bigger square wave. I think what should happen is that the other transistor
being part of this "two transistor/ferrite transformer oscillator thing"
should develop a voltage at the collector that is greater than the input
voltage and this closes the loop so then when you take your finger off the
"on" button the square wave feed into traansistor 1 base doesn't stop. What
I have is a DC at about half supply from the second transistor so I am
thinking higher frequency transistors because the square wave stops when you
remove your finger from the button. This thing is probably worth about Ł10
if working, it's wierd what gets your attention and why. There is no
possible sensible reason for not putting it in the bin other than "why
doesn't it work".
 
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:eU_pc.14$LH3.0@newsfe1-win...
"L. Fiar" <_@_._> wrote in message news:40a7ee1c.0@entanet...

A search for "D1303" brings up a 2SD1303:
Plastic package, TO92.
Looking at the flat side...
_________
| |
| |
| 2SD1303 |
| |
|_________|
| | |
| | |
e c b

NPN, 60v, 2Amp, 1Watt.
Suggested equiv. 2SD1207

I stuck two same number NPNs in and got the scope out.

What I have is a two transistor configuration. The device will run from
either 2 X 1.5V batteries or a 4.5 V power brick. This goes through a
small ferrite transformer to the centre leg of one transistor (emitter?),
Click to expand...
With an NPN device, I would suspect that this would be the supply to the
collector.

one outside leg is grounded (collector?)
Click to expand...
Are you sure you don't mean emitter?
The collector of an NPN transistor would not be grounded.

the other outside leg (base?) is fed from a big, square,
multi leg thing out of which comes a square wave
when you press "on".
Click to expand...
I would agree that this could well be the base.

This makes the transistor middle leg (emitter) have a
bigger square wave.
Click to expand...
With an NPN transistor, and your reading being from a scope, this is most
likely the collector.
For the output to be from the emitter, you would have an emitter follower
stage - giving a lower voltage output.

These connections would fit the transistor pin data above.

This thing is probably worth about Ł10 if working, it's
wierd what gets your attention and why. There is no possible
sensible reason for not putting it in the bin other than "why
doesn't it work".
Click to expand...
It's probably about the challenge and not letting something
beat you. I have often done such things.
 
"L. Fiar" <_@_._> wrote in message news:40ac532d.0@entanet...
"Mjolinor" <mjolinor@hotmail.com> wrote in message
news:eU_pc.14$LH3.0@newsfe1-win...

"L. Fiar" <_@_._> wrote in message news:40a7ee1c.0@entanet...

A search for "D1303" brings up a 2SD1303:
Plastic package, TO92.
Looking at the flat side...
_________
| |
| |
| 2SD1303 |
| |
|_________|
| | |
| | |
e c b

NPN, 60v, 2Amp, 1Watt.
Suggested equiv. 2SD1207

I stuck two same number NPNs in and got the scope out.

What I have is a two transistor configuration. The device will run from
either 2 X 1.5V batteries or a 4.5 V power brick. This goes through a
small ferrite transformer to the centre leg of one transistor
(emitter?),

With an NPN device, I would suspect that this would be the supply to the
collector.

one outside leg is grounded (collector?)

Are you sure you don't mean emitter?
The collector of an NPN transistor would not be grounded.

the other outside leg (base?) is fed from a big, square,
multi leg thing out of which comes a square wave
when you press "on".

I would agree that this could well be the base.

This makes the transistor middle leg (emitter) have a
bigger square wave.

With an NPN transistor, and your reading being from a scope, this is most
likely the collector.
For the output to be from the emitter, you would have an emitter follower
stage - giving a lower voltage output.

These connections would fit the transistor pin data above.

This thing is probably worth about Ł10 if working, it's
wierd what gets your attention and why. There is no possible
sensible reason for not putting it in the bin other than "why
doesn't it work".

It's probably about the challenge and not letting something
beat you. I have often done such things.
Click to expand...
OK so I'm a pillock :) no change there then.

Yes the above is probably correct, I can't think and write at the same time
which probably says I shouldn't post in newsgroups but I am afraid your
stuck with me.
 
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