723 IC origins / was Re: Hardware Hobbyists vs. Emulator Jockeys

[dwight elvey]

----------------------------------------
> Date: Thu, 18 Jun 2009 18:27:18 -0700
> From: hilpert at cs.ubc.ca
> To: General at invalid.domain
> Subject: 723 IC origins / was Re: Hardware Hobbyists vs. Emulator Jockeys
>
> blstuart at bellsouth.net wrote:
>>>>
>>>> I just checked what I have. My 1977 Voltage Regulator
>>>> Handbook doesn't list it at all.
>>>>
>>>> My 1980 Linear Databook
>>>> includes a couple of switchers among the typical applications.
>>>> That would suggest such a data sheet would have to be
>>>> around 1978 or 79.
>>>
>>> The earliest example I have at hand for the 723 is the manufacturer's schematic
>>> for the Wang 520 calculator. The power supply page with two 723's on it (used
>>> just in linear mode), is dated early 1971. Perhaps the earlier handbook was
>>> from a manufacturer that didn't 2nd-source it.
>>
>> It was a National book, but I can believe that it could
>> well be incomplete. That's why I equivocated and said
>> it suggested a time frame. The existence of it in these
>> earlier systems clearly moves the lower bound.
>
> Funny that it wouldn't even be mentioned, perhaps the chip was old enough by
> that time that it got left out of a current-techniques handbook (as opposed to
> a databook) in favor of newer stuff.
 
Hi
 I used one in the control for one of the voltages
in a mass spectrometer in 1976. It was an old part
even then as I bought it at a surplus shop.
Dwight

 
_________________________________________________________________
Bing™  brings you maps, menus, and reviews organized in one place.   Try it now.
http://www.bing.com/search?q=restaurants&form=MLOGEN&publ=WLHMTAG&crea=TEXT_MLOGEN_Core_tagline_local_1x1