[sdiy] [AH] U726hc Real deal?

[Tom Bugs]

I wondered before why no-one seems to have done a clone of the ua726.

Doesn't *SEEM* all that complex?!
A nice matched pair (eg LS318) is the main core.
6 transistors (I presume general purpose?), 2 x 6V2 zeners and 6 
standard resistors.. - those parts being for the heating element.

Get the pin placement right, encapsulate it in goo..

What am I wrong on?

[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]

Tom



On 09/09/2015 14:00, . . wrote:
> Wow don't pay 90$ for that!
>
> 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.
>
>
>
> On Wed, Sep 9, 2015 at 7:42 AM, Synth Parts 
> <synthpartsdotcom at gmail.com <mailto:synthpartsdotcom at gmail.com>> wrote:
>
>     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)...
>
>     Doug
>     synthparts.com <http://synthparts.com>
>
>     On Wed, Sep 9, 2015 at 4:34 AM, Kenny Balys <kenny at beatkamp.com
>     <mailto:kenny at beatkamp.com>> wrote:
>
>
>         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.
>
>         On 09-09-15 09:29 , Synth Parts wrote:
>
>             I recognize that sellers name as one selling fake SSM2040s
>             a while back.
>             Lots of feedback regarding fake parts -
>
>             http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=polida2008&iid=400613597638&de=off&items=25&which=negative&interval=365&_trkparms=negative_365
>
>             Doug
>             synthparts.com <http://synthparts.com>
>
>             On Tue, Sep 8, 2015 at 10:30 PM, Larry Dee
>             <mintlake at bctonline.com <mailto:mintlake at bctonline.com>>
>             wrote:
>
>                 Is this the real thing?
>
>
>                 http://www.ebay.com/itm/1PCS-CONTROLLED-DIFFERENTIAL-PREAMPLIFIER-IC-FAIRCHILD-TO-100-CAN-10-UA726HC-/400613597638?hash=item5d466e61c6
>
>
>
>                 I’m so burned out on this issue – sheeeesh for $90 it
>                 better be NOS.
>                 Tried searching the AH archives for recent content on
>                 this subject but did
>                 not get anywhere.  Sorry to be redundant, but what is
>                 the latest word on
>                 this part?
>
>
>
>

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20150909/4fe0593a/attachment.htm>