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replacement transistor 4 dc converter???

S

superdvd

Jan 1, 1970
0
I have a vfd game that I am trying to fix, I found a blown 2sd882 npn
transistor in the dc - dc converter but an exact replacement is not easily
obtainable, I tried a tip31 but from what I can tell with my multimeter and
limited knowledge it is not oscillating, I only surmise this by the fact
that the game still does not function at all and it is trying to draw a very
high current, I have a current limiting power supply so I can safely try it
out still, anyhow if the transistor is turned on all the time it provides a
constant short circuit so I presume it is suppose to oscillate. The game
runs from 6v dc. I can find not other obvious fault.
Can someone please suggest a suitable transistor, with my limited knowledge
I have been unable to determine anything other than a tip31.

http://www.datasheetcatalog.com/datasheets_pdf/2/S/D/2/2SD288.shtml
 
T

Tim Schwartz

Jan 1, 1970
0
superdvd said:
I have a vfd game that I am trying to fix, I found a blown 2sd882 npn
transistor in the dc - dc converter but an exact replacement is not easily
obtainable, I tried a tip31 but from what I can tell with my multimeter and
limited knowledge it is not oscillating, I only surmise this by the fact
that the game still does not function at all and it is trying to draw a very
high current, I have a current limiting power supply so I can safely try it
out still, anyhow if the transistor is turned on all the time it provides a
constant short circuit so I presume it is suppose to oscillate. The game
runs from 6v dc. I can find not other obvious fault.
Can someone please suggest a suitable transistor, with my limited knowledge
I have been unable to determine anything other than a tip31.

http://www.datasheetcatalog.com/datasheets_pdf/2/S/D/2/2SD288.shtml
Hello,

Could you please clarify the part number? You have 2SD882 in the text
and a link to a 2SD288 below.

Regards,
Tim Schwartz
Bristol Electronics
 
D

Dave

Jan 1, 1970
0
superdvd said:
I have a vfd game that I am trying to fix, I found a blown 2sd882 npn
transistor in the dc - dc converter but an exact replacement is not easily
obtainable,

They've got 2SD288 for $4.99 at www.acme-sales.net. Goldmine for old Jap
transistors
 
J

Jim Land

Jan 1, 1970
0
superdvd said:
I have a vfd game that I am trying to fix, I found a blown 2sd882 npn
transistor in the dc - dc converter but an exact replacement is not
easily obtainable, I tried a tip31 but from what I can tell with my
multimeter and limited knowledge it is not oscillating, I only surmise
this by the fact that the game still does not function at all and it
is trying to draw a very high current, I have a current limiting power
supply so I can safely try it out still, anyhow if the transistor is
turned on all the time it provides a constant short circuit so I
presume it is suppose to oscillate. The game runs from 6v dc. I can
find not other obvious fault. Can someone please suggest a suitable
transistor, with my limited knowledge I have been unable to determine
anything other than a tip31.

http://www.datasheetcatalog.com/datasheets_pdf/2/S/D/2/2SD288.shtml

The NTE cross-reference says you can replace it with an NTE196:

http://www.nteinc.com/specs/100to199/NTE196.html
 
S

superdvd

Jan 1, 1970
0
Tim Schwartz said:
Hello,

Could you please clarify the part number? You have 2SD882 in the text
and a link to a 2SD288 below.

Regards,
Tim Schwartz
Bristol Electronics

Sorry, that was real helpful of me wasn't it, it was the 882 I was after.
 
S

superdvd

Jan 1, 1970
0
M

Mark Robinson

Jan 1, 1970
0
superdvd said:
I have a vfd game that I am trying to fix, I found a blown 2sd882 npn
transistor in the dc - dc converter but an exact replacement is not easily
obtainable, I tried a tip31 but from what I can tell with my multimeter and
limited knowledge it is not oscillating, I only surmise this by the fact
that the game still does not function at all and it is trying to draw a very
high current, I have a current limiting power supply so I can safely try it
out still, anyhow if the transistor is turned on all the time it provides a
constant short circuit so I presume it is suppose to oscillate. The game
runs from 6v dc. I can find not other obvious fault.
Can someone please suggest a suitable transistor, with my limited knowledge
I have been unable to determine anything other than a tip31.

http://www.datasheetcatalog.com/datasheets_pdf/2/S/D/2/2SD288.shtml

Note that the TIP31 (BCE) has a different pinout from the 2SD288 (ECB).

The higher saturation voltage of the TIP31 will make it dissipate more power
making the supply less efficient, while the lower gain may make the circuit
fail to work altogether.

The 2SD288 is available if you get stuck.
 
S

superdvd

Jan 1, 1970
0
Mark Robinson said:
Note that the TIP31 (BCE) has a different pinout from the 2SD288 (ECB).

The higher saturation voltage of the TIP31 will make it dissipate more power
making the supply less efficient, while the lower gain may make the circuit
fail to work altogether.

The 2SD288 is available if you get stuck.

Thanks, that explanation is interesting and makes sense to me now that you
point it out.
 
M

Mark Robinson

Jan 1, 1970
0
superdvd said:
Thanks, that explanation is interesting and makes sense to me now that you
point it out.

Oh, and I meant 2SD882 in both places where I said 2SD288 above too.
 
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