VG:

Without part numbers and packages and a roadmap - you are asking way too=20
much, in my opinion.

On 20/08/2013 2:27 AM, veegee wrote:
> On 2013-08-17 7:56 PM, RussellMc wrote:
>> VG
>>
>> This is the original thread and these were my comments at the time:
>> [...]
> I checked the power supply lines with the oscilloscope and there doesn't
> seem to be any stability issues or oscillation at all. I'm also using
> +/-14V transient voltage suppressor diodes on the power lines.
>
> I would draw up schematics, but this is happening with quite a few
> different types of ICs. I've noticed that the TO-220 (without heatsink)
> type packages are not failing, so it might be a heat dissipation issue
> with the plastic DIP packages. Still strange since I'm pretty sure I'm
> operating well within the specifications of the plastic DIP parts.
>
> I've also noticed that lowering the opamp and MOSFET gate driver supply
> voltage to 0/5V (red PSU wire) from -12/+12 volts (blue/yellow wires)
> /greatly/ reduces operating temperature and failure. I don't get it -
> the opamps are fully specified to +/-20V or more and indefinite output
> short circuit. Might be something funny happening with the +/-12V power
> supply lines, but same result was observed from two different power
> supplies tested.

--=20
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