[sdiy] [AH] Re: [AH] U726hc Real deal?

[Tom Farrand]

The supplied patent application link I clicked on had nothing to do
with a ua726.  Seems like a silicon heater subsystem for temperature
stabilization in a 3-bit flash A/D.  It appeared that all the
transistors were MOSFETs (both N and P-channel devices).  I could
easily be brain dead but a device with fancy-pants
silicon-on-insulator technology A/D seems rather far afield from a
ua726.  No?

Peace.
Tom Farrand



On Sun, Sep 13, 2015 at 4:12 PM, Tom Bugs <admin at bugbrand.co.uk> wrote:
> Super - thanks Paul!
> Lots more reading to do as this all progresses.
> Cheers! Tom
>
>
> On 11/09/2015 18:25, Paul Anderson 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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