[sdiy] Pin Outs

[David Ingebretsen]

I just found this page. Looks like some good info on testing devices.

http://www.repairfaq.org/REPAIR/F_semitest.html#sttuj

David

~~ -----Original Message-----
~~ From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
~~ bounces at dropmix.xs4all.nl] On Behalf Of David Ingebretsen
~~ Sent: Tuesday, February 23, 2010 10:49 AM
~~ To: 'SDIY List'
~~ Subject: [sdiy] Pin Outs
~~ 
~~ I am not finding a data sheet (well, at least one with any extensive
info)
~~ or pin-outs for a couple of obsolete parts.
~~ 
~~ 2N5163 n channel jfet
~~ 2n4891 UJT
~~ 
~~ The basic question is, is there a "hand test" I can do to determine the
~~ pin-out for sure?
~~ 
~~ I have a simple circuit I could breadboard for the UJT, but nothing
really
~~ for the JFET.
~~ 
~~ I have some "replacement" parts which have appropriate pin outs printed
on
~~ the envelope they came in, but I also have some of the original vintage
~~ parts which I would rather use.
~~ 
~~ The component packages between the original parts and the replacements
are
~~ different subtly.
~~ 
~~ To complicate matters, I have two vintage version of the 2n5163, in
~~ similar
~~ but different packages, one is a TO-106 I think with a flat side by one
~~ pin,
~~ one does not have a flat on it at all.
~~ 
~~ JFET:
~~                            .   apex
~~ Pins are in a triangle   .   .   base of triangle
~~ 
~~ Package 1: TO-106(?) round with round top flat is offset adjacent to one
~~ of
~~ the pins (vintage)
~~ 
~~                         .
~~                  Flat .   .
~~ 
~~ Package 2: TO-106(?) round with round top, flat opposite middle pin,
~~ parallel to base of the triangle (new replacement)
~~ 
~~ 
~~                         .
~~                       .   .
~~                        Flat
~~ 
~~ Package 3: TO-106(?) round with round top, no flat (vintage)
~~ 
~~ UJT
~~ 
~~ Pins are in a triangle, metal housing with a tab
~~ Package 1: TO-18(?) tab between triangle apex pin and a triangle base pin
~~ (new replacement)
~~ 
~~                     .
~~               tab .   .
~~ 
~~ Package 2: TO-18(?) tab at an angle, but is between the two triangle base
~~ pins.
~~ 
~~                     .
~~                   .   .
~~                   tab
~~ 
~~ I found some old schematics which suggest two different pin-outs for the
~~ JFET, Source, Gate, Drain, and Source, Drain, Gate, both suggesting a TO-
~~ 106
~~ round top package was used, but I'm not sure.
~~ 
~~ I have struck out completely on the UJT. Believe me, I have searched
every
~~ internet datasheet archive I could find.
~~ 
~~ I have a simple schematic for the UJT which I guess I can breadboard and
~~ try
~~ the replacement I know the pin-out for and then try an old part to see.
~~ But,
~~ I'm a bit at a loss for the JFET.
~~ 
~~ Thanks
~~ David
~~ 
~~ _______________________________________________
~~ Synth-diy mailing list
~~ Synth-diy at dropmix.xs4all.nl
~~ http://dropmix.xs4all.nl/mailman/listinfo/synth-diy