Phil Morris wrote:
>
>> 47 pF would be right and it was most likely put there to stop the op
>> amp from oscillating, if needed.
>> ---------------------------------------------------------------------------
>>
>
> I wonder if the lack of said cap would account for the very intermittent
> problem that I have on the X Axis on this board, namely the X Axis
> distorts wildly from time to time. It's definitely something to do with
> the DAC circuitry (curiously enough, prodding pin 16 of the DAC312 for
> the X Axis temporarily 'resets' things and all looks good, until the
> next time). The alphanumerics at the bottom of the test screen also
> gently slope upwards a little as you look along to the right.
>
> The 7815 regulator had blown on this board so no doubt that took out a
> few things in the DAC section, but all the chips and transistors in this
> area have now been replaced.
>
>
> Phil
Certainly no downside to installing the capacitor and if the op amp IS
oscillating it could cause some weird effects.
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Received on Sun Sep 3 16:17:09 2006
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