Hello all,

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF

What is the circuit? Is it a critical application? Any NPN might work
depending on the voltages and current. Again gain depends on their
application
Frank

"frank" wrote in message
...
Hello all,

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF

Frank S wrote:
What is the circuit? Is it a critical application? Any NPN might work
depending on the voltages and current. Again gain depends on their
application

I don't have a schematic, it's an old VHF transceiver board that I
wanted to debug. I don't even have the transceiver shell to identify it.
Of course if I had a schematic I could guess better.

Thanks
Frank IZ8DWF

frank wrote:

Frank S wrote:
What is the circuit? Is it a critical application? Any NPN might work
depending on the voltages and current. Again gain depends on their
application

I don't have a schematic, it's an old VHF transceiver board that I
wanted to debug. I don't even have the transceiver shell to identify it.
Of course if I had a schematic I could guess better.


If it is a Motorola radio, it is a house number. You would have to
talk to a Motorola two way radio shop and give them the assembly number
to figure out what radio it is from. The information was never made
public.


--
The movie 'Deliverance' isn't a documentary!

frank wrote in message
...
Hello all,

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF


what sort of date ?

N_Cook wrote:

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF


what sort of date ?

on the board it is printed 19 MAI 1982, looks like a date in some
language.

Regards
Frank IZ8DWF

frank wrote in message
...
Hello all,

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF


Looks as though you'll have to desolder that other one and measure the gain
at different f and repeated with some added pF, and if darying try and find
Vc and Ic max or at least some minimum values from the circuit their in


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

N_Cook wrote:
frank wrote in message
...
Hello all,

I need to replace a transistor which only markings are the motorola
logo and "9570". It's TO-92 case and NPN (measured a good one in the
same circuit).
Any hint on specs about it are welcome.
Regards

Frank IZ8DWF


Looks as though you'll have to desolder that other one and measure
the gain at different f and repeated with some added pF, and if
darying try and find Vc and Ic max or at least some minimum values
from the circuit their in


Frank,
I used to work at a Motorola 2-way FM radio service shop (back in the 70s).
Many of their semiconductors were marked in this fashion, but the real
device number was preceded by an "M"; thus, making the transistor number
M9570. Search the NTE reference for a cross and see if it matches with what
you know about it.

Cheers!!
--
David
masondg44 at comcast dot net

On 09 Oct 2009 08:56:37 GMT, frank put finger
to keyboard and composed:

I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).

It crosses to the following:
http://www.nteinc.com/specs/100to199/pdf/nte123ap.pdf

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Franc Zabkar wrote:
I need to replace a transistor which only markings are the motorola logo
and "9570". It's TO-92 case and NPN (measured a good one in the same
circuit).

It crosses to the following:
http://www.nteinc.com/specs/100to199/pdf/nte123ap.pdf

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

Thank you very much! It looks like a common part will fit in its place
though.

Now I have to find a JFET replacement for a custom HP part, but that's
another story... I'll dig on my HP parts units first.

Best regards

Francesco