[sdiy] TLC272 trouble

[Richie Burnett]

> You might find the unconnected op-amp oscillating luodly at several
> MHz, and heating up the silicon.
>
> If you're not using it, tie it off safely, for example o/p to -ve
> input, +ve input to: GND if dual rail, mid-rail if single supply.

Just remember to make sure that the op-amp is unity-gain stable before doing 
this.  Otherwise, you might find the op-amp oscillating loudly at several 
MHz, and heating up the silicon.

Unity gain follower is okay for most old slow op-amps.  But, some modern 
high-performance op-amps are compensated for optimum performance at higher 
signal gains and are borderline stable with full negative feedback.

-Richie,