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Howdy...
<p>you reverse bias the base - emitter junction (for an NPN) by putting
the
<br>positive voltage on the emitter and the negative voltage on the base.
<p>Selected 2N2712 were the favorites back in the 70's. I just got
a few
<br>brand new ones in surface mount. Maybe I can try one or two out....
<p>H^) harry
<p>"THOMAS, Mervyn" wrote:
<blockquote TYPE=CITE>
<pre WRAP>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@astrium-space.com
*Tel.: +(0)23 9270 5394
* Fax.: +(0)23 9270 8663
-----Original Message-----
From: sandrotraversi [<a href="mailto:straversi@libero.it">mailto:straversi@libero.it</a>]
Sent: 26 November 2001 02:56:PM
To: synth-diy@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
<a href="http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf">http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf
</a><<a href="http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf">http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf</a>>
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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<hr WIDTH="90%" SIZE=4><style></style>
<span class=920374515-26112001><font face="Arial"><font color="#0000FF"><font size=-1>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.</font></font></font></span> <b><i><font face="Book Antiqua"><font color="#800000">Merv
Thomas</font></font></i></b>
<br><b><i><font face="Bookman Old Style"><font color="#333399"><font size=-1>UNIX
CAE SysAdmin - Portsmouth</font></font></font></i></b>
<br><font face="Wingdings"><font color="#808080">*</font></font><font face="Fujiyama2"><font color="#000000"><font size=-2>Email:</font></font></font><u>
<font face="Fujiyama2"><font color="#0000FF"><font size=-2>mervyn.thomas@astrium-space.com</font></font></font></u>
<br><font face="Wingdings"><font color="#808080">(</font></font><font size=-2>Tel.:<span
class=920374515-26112001></span>+(0)23
9270 5394</font>
<br><font face="Wingdings"><font color="#808080">2</font></font> <font size=-2>Fax.:<span
class=920374515-26112001></span>+(0)23
9270 8663</font>
<blockquote dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<div class="OutlookMessageHeader" dir="ltr"><font face="Tahoma"><font size=-1>-----Original
Message-----</font></font>
<br><font face="Tahoma"><font size=-1><b>From:</b> sandrotraversi [<A HREF="mailto:straversi@libero.it">mailto:straversi@libero.it</A>]</font></font>
<br><font face="Tahoma"><font size=-1><b>Sent:</b> 26 November 2001 02:56:PM</font></font>
<br><font face="Tahoma"><font size=-1><b>To:</b> synth-diy@dropmix.xs4all.nl</font></font>
<br><font face="Tahoma"><font size=-1><b>Subject:</b> [sdiy] Newbie &
Zener D equivalents</font></font>
<br> </div>
Hi All, I'm a newbie and I'm trying to build a Noise Generator from
an old Practical Electronic Sound Synthsizer modul <a href="http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf">http://omega.tellus.vallentuna.se/anders/pdf/pess5.pdf</a> 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 </blockquote>
</blockquote>
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