You can use the LM324 in Class A mode - just add a pulldown resistor on
the output. I've done it many times, and you can get +10 and -15 no
problem, and no crossover distortion.

Cheerful regards,

Bob



>   The greater the rail voltages, the greater the headroom in the system.
> The gain blocks are set up to be "off" when the CV is at the negative
> rail,
> hence the negative rail requirement.  The positive rail would be nice,
> too,
> but getting close to the negative rail is a lot more important or else
> there'll be bleed-through.
>
>   I've used the 324 lots of times and like it fine, but it has this goofy
> output stage (well, not really goofy -- it's designed for low-power
> consumption, which I don't care about) that has a noticable glitch at the
> crossover point into high-ish impedance loads.  It's really visible on a
> scope and audible if the signal in question is audio.  But the 324 does go
> down to 20mV or so of the negative rail, and it's cheap, and has a wide
> range of operating voltages.  As for the other specs, any parameter I
> didin't list isn't something I'm overly concerned with.
>
>   If I can't find a part that works, I'll just use the 324 or bring down
> the
> rails and recalculate the biasing.  But I'd  like to not have to.  Even a
> R-R (or just the negative rail) part that was okay with +/- 10 would be
> pretty great.


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