[sdiy] If you thought the LM324 was slow ...

[sbernardi at attbi.com]

A resistor to the V- supply (GND if single ended) is 
supposed to fix the crossover distortion. About 10K or 
so.
> I was reading in the "Op-Amp Cookbook", to save power, the LM324 uses a
> Class B output stage, not Class AB. So that accounts for the high crossover
> distortion.
> > 
> > The PS-synths use LM324s in their VC-ADSRs, as a buffer for the
> > integration capacitor, and as a schmitt trigger / flipflop for the
> > attack phase. 
> > It's a decent solution, especially as single supply operation is required,
> > and the input voltage goes down to GND. No major speed issues here.
> > (0.5V/us slew means 30us for 15V - fine for an envelope.)
> > 
>