[sdiy] [AH] U726hc Real deal?

[Paul Anderson]

Hah! I didn't notice the filing date. Looks like it was assigned to TI. 

Sent from my iPhone

> On Sep 11, 2015, at 2:14 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> Filed Nov 3, 2011? That's a bit after the Minimoog, isn't it?
> 
>> On 11 Sep 2015, at 18:25, Paul Anderson <wackyvorlon at me.com> wrote:
>> 
>> Looks like I found the patent:
>> 
>> http://www.google.com/patents/US20120112823
>> 
>> Sent from my iPhone
>> 
>>> On Sep 9, 2015, at 9:19 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
>>> 
>>> 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> 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
>>>> 
>>>> On Wed, Sep 9, 2015 at 4:34 AM, Kenny Balys <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
>>>> 
>>>> On Tue, Sep 8, 2015 at 10:30 PM, Larry Dee <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?
>>> 
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