[sdiy] Prophet 10 op-amp swaps?

[cheater00 .]

On Thu, Aug 1, 2013 at 12:35 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> OPA134 has a Gain-bandwidth product of 8MHz, so that might explain why it works fine.
>
> It looks like putting amps that are *too* fast in this circuit isn't the best idea since it doesn't include compensation we might consider standard, but that they didn't need for the older op-amps they used originally.
>
> T.

It seems to me the line lies somewhere halfway between 1 MHz and 1 GHz
- logarithmically. The distance is roughly ten octaves, and if you go
5 octaves up from 1 MHz then you're at 32 MHz, which seems to be
around the value when problems start if you don't add said
compensation. I'm sure it works differently for different op amps
though. But if you're closer to 1 GHz than 1 MHz, it seems likely
you're going to run into trouble.

Cheers,
D.