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I guess there's a few other ways, yes, to do a matched pair with
integral heater.. but the idea here was really a drop-in clone for
the ua726<br>
(not that I actually have any personal need for them - just aware of
the ridiculous scarcity pricing that keeps cropping up - and figured
it looked do-able - ie. fun project potential, not that I really
need more projects..)<br>
Also MAT04 now says obsolete.. THAT300 series would be a fine
replacement in that case.<br>
Ta, Tom<br>
<br>
<div class="moz-cite-prefix">On 09/09/2015 18:36, Rick Jansen wrote:<br>
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cite="mid:32B4F5E0-90B7-451B-A15F-22D194D8EC96@xs4all.nl"
type="cite">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div>Use a mat04.. Two transistors as the matched pair, one as
heater, one as sensor. One external transistor as a clamp. See
the circuit at the bottom of <a moz-do-not-send="true"
href="http://dropmix.xs4all.nl/rick/Emusic/Moog/moogvcf_schematic.gif">http://dropmix.xs4all.nl/rick/Emusic/Moog/moogvcf_schematic.gif</a></div>
<div><br>
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<div>Rick</div>
<div><br>
On 09 Sep 2015, at 15:19, Tom Bugs <<a moz-do-not-send="true"
href="mailto:admin@bugbrand.co.uk">admin@bugbrand.co.uk</a>>
wrote:<br>
<br>
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I wondered before why no-one seems to have done a clone of the
ua726.<br>
<br>
Doesn't *SEEM* all that complex?!<br>
A nice matched pair (eg LS318) is the main core.<br>
6 transistors (I presume general purpose?), 2 x 6V2 zeners and
6 standard resistors.. - those parts being for the heating
element.<br>
<br>
Get the pin placement right, encapsulate it in goo.. <br>
<br>
What am I wrong on? <br>
<br>
[I don't want to fully take on such a project, though could
potentially do a design up for initial testing with a view to
someone running a production in a friendly open-source-ish
manner]<br>
<br>
Tom<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 09/09/2015 14:00, . . wrote:<br>
</div>
<blockquote
cite="mid:CAMUkUjRzSoT+=mWxbJtjq1QJWBSyX4OHQ+Uxm=NX7PTFLVV+-g@mail.gmail.com"
type="cite">
<div dir="ltr">Wow don't pay 90$ for that!
<div><br>
</div>
<div>I've bought a few fakes some years ago for about
10-15$ each iirc They worked according to my tech at
the time. It's hard to say if they perform exactly the
same, I ended up putting in a real one in just to be
sure.</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Sep 9, 2015 at 7:42 AM,
Synth Parts <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:synthpartsdotcom@gmail.com"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:synthpartsdotcom@gmail.com">synthpartsdotcom@gmail.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Also very suspicious is the pic of the
one with the year 2000 date code and that there's no
pics showing the pins (they were gold on the real
ones)...
<div><br>
</div>
<div>Doug </div>
<div><a moz-do-not-send="true"
href="http://synthparts.com" target="_blank">synthparts.com</a></div>
</div>
<div class="HOEnZb">
<div class="h5">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Sep 9, 2015 at
4:34 AM, Kenny Balys <span dir="ltr"><<a
moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:kenny@beatkamp.com"><a class="moz-txt-link-abbreviated" href="mailto:kenny@beatkamp.com">kenny@beatkamp.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"><br>
I doubt that these were ever shipped to, or
made in China so I would look elsewhere. Its
hard to imagine that in the 1970's,
Fairchild, in the height of the cold war,
would be manufacturing vital components such
as these in China.<br>
<br>
On 09-09-15 09:29 , Synth Parts wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> I recognize
that sellers name as one selling fake
SSM2040s a while back.<br>
Lots of feedback regarding fake parts -<br>
<br>
<a moz-do-not-send="true"
href="http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=polida2008&iid=400613597638&de=off&items=25&which=negative&interval=365&_trkparms=negative_365"
rel="noreferrer" target="_blank">http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=polida2008&iid=400613597638&de=off&items=25&which=negative&interval=365&_trkparms=negative_365</a><br>
<br>
Doug<br>
<a moz-do-not-send="true"
href="http://synthparts.com"
rel="noreferrer" target="_blank">synthparts.com</a><br>
<br>
On Tue, Sep 8, 2015 at 10:30 PM, Larry Dee
<<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:mintlake@bctonline.com">mintlake@bctonline.com</a>>
wrote:<br>
<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> Is this
the real thing?<br>
<br>
<br>
<a moz-do-not-send="true"
href="http://www.ebay.com/itm/1PCS-CONTROLLED-DIFFERENTIAL-PREAMPLIFIER-IC-FAIRCHILD-TO-100-CAN-10-UA726HC-/400613597638?hash=item5d466e61c6"
rel="noreferrer" target="_blank">http://www.ebay.com/itm/1PCS-CONTROLLED-DIFFERENTIAL-PREAMPLIFIER-IC-FAIRCHILD-TO-100-CAN-10-UA726HC-/400613597638?hash=item5d466e61c6</a><br>
<br>
<br>
<br>
I’m so burned out on this issue –
sheeeesh for $90 it better be NOS.<br>
Tried searching the AH archives for
recent content on this subject but did<br>
not get anywhere. Sorry to be
redundant, but what is the latest word
on<br>
this part?<br>
<br>
</blockquote>
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<pre class="moz-signature" cols="72">--
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
<a class="moz-txt-link-abbreviated" href="http://www.bugbrand.co.uk">www.bugbrand.co.uk</a></pre>
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