[sdiy] Pin Outs

[Tom Wiltshire]

You could attach it to one of these, my favourite gizmo:

http://www.peakelec.co.uk/acatalog/jz_dca55.html

T.

(Not affiliated to Peak Electronic Design, although they're not far  
from here.)

On 23 Feb 2010, at 17:49, David Ingebretsen wrote:

> 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
>
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