[sdiy] Newbie & Zener D equivalents

[harry]

Howdy...

you reverse bias the base - emitter junction (for an NPN) by putting the

positive voltage on the emitter and the negative voltage on the base.

Selected 2N2712 were the favorites back in the 70's.  I just got a few
brand new ones in surface mount. Maybe I can try one or two out....

H^) harry

"THOMAS, Mervyn" wrote:

> IIRC the Z1J is(was) a noise diode - there was also a Z5J. I don't
> think
> they're available any more but you could use a transistor in its
> place. I
> can't remember which 2 pins of the TR you use (B-E || C-E) but I'm
> sure
> someone else on the list will have the answer to that one.
>
>
> Merv Thomas
> UNIX CAE SysAdmin - Portsmouth
> *Email: mervyn.thomas at astrium-space.com
> *Tel.:    +(0)23 9270 5394
> * Fax.:    +(0)23 9270 8663
>
> -----Original Message-----
> From: sandrotraversi [mailto:straversi at libero.it]
> Sent: 26 November 2001 02:56:PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Newbie & Zener D equivalents
>
>
> Hi All,
>
> I'm a newbie and I'm trying to build a Noise Generator from an old
> Practical
> Electronic Sound Synthsizer modul
> http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf
> <http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf>
>
> The schematic needs a zener diode marketed in 1973 (!) by Semitron Ltd
> as
> Z1J.
>
> Which equivalent Z diode can I use in place of that ? ( possibly
> available
> in Italy) .
>
> 2nd Q - circuit needs also 2 caps about 0.01 uF - may I use polyester
> type
> or better ceramic disks ?
>
> Sandro
>
>
>
> ...
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>    ----------------------------------------------------------------
> IIRC the Z1J is(was) a noise diode - there was also a Z5J. I don't
> think they're available any more but you could use a transistor in its
> place. I can't remember which 2 pins of the TR you use (B-E || C-E)
> but I'm sure someone else on the list will have the answer to that
> one. Merv Thomas
> UNIX CAE SysAdmin - Portsmouth
> *Email: mervyn.thomas at astrium-space.com
> (Tel.:+(0)23 9270 5394
> 2 Fax.:+(0)23 9270 8663
>
>      -----Original Message-----
>      From: sandrotraversi [mailto:straversi at libero.it]
>      Sent: 26 November 2001 02:56:PM
>      To: synth-diy at dropmix.xs4all.nl
>      Subject: [sdiy] Newbie & Zener D equivalents
>
>      Hi All, I'm a newbie and I'm trying to build a Noise
>      Generator from an old Practical Electronic Sound Synthsizer
>      modul
>      http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf The
>      schematic needs a zener diode marketed in 1973 (!) by
>      Semitron Ltd as Z1J. Which equivalent Z diode can I use in
>      place of that ? ( possibly available in Italy) . 2nd Q -
>      circuit needs also 2 caps about 0.01 uF - may I use
>      polyester type or better ceramic disks ? Sandro
>
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