[sdiy] CV mixer overload?

[Kenneth Martinez]

Happy Harry wrote:

> ...Two possible scenarios:
>
> 1: The voltages add together, and are clipped at the voltage
> output limit of the opamp. (true for 741, 1458, some others)
>
> 2: The voltage increases until the positive rail is reached...
> as as the overdrive increases, the op-amp output suddenly jumps
> to the NEGATIVE rail, and stays there until some time after the
> input overdrive is removed. This is called "Phase Reversal". Some opamps
> have this "feature" some don't. Worst case... the opamp
> latches at the negative rail until power is reset !

John Blacet wrote:

>Typical Op amps self limit at about +/-13.5V with a +/-15V supply. There
>is no question of damage here in general.
>
>If you have an application where you don't want the CV product to exceed
>a certain output or go negative, you can use a zener diode to further
>limit the output.


I'm using TL072s or TL082s for the summing amp...datasheet says "latch up
free", so I'm hoping these will clip the output at their max of 13.5V (?)