[sdiy] Overdriving 4069UB

[Seb Francis]

Harry Bissell Jr wrote:

> If he can truly reach 17V on a 15V supply... there is likely substantial
> current there. 18V is the max rating (ok some might say 20V)... so I'd 
> still
> be very concerned.  I agree that raising the input resistor value is 
> prudent...
> but the feedback has to go up as well to keep the same gain.
>
When I said 17V ptp, this was just the number that my digital scope told 
me - it's probably not that accurate and could be like 16.5V or 
something.  With a 100K input resistor (and a 1M feedback resistor), 
there *can't* be very much current flowing, so I feel fairly safe now.

> I might want to let that one run for some weeks in overdrive...

This is one IC that's definitely going to be put in a socket for easy 
replacement!

Seb