[sdiy] Midi2cv with at least 8 channels .. ?

[harrybissell]

Yuck !!!  ;^P

This reference to the LM324, which I presume is the buffer amp.
Having just tried this amp in this application LAST NIGHT... I was
not happy with the performance.

The bias current flows 'out' of the PNP input transistors... and charges
the
hold cap.  OTOH we have different circuits...and I'm using a much
smaller
cap.  In my case it looks like a sawtooth as the cap charges.
Agreed...with a
.1uF that effect would be much less than I saw. Also depends on the
refresh
rate.

I'd suggest the TL084 as a higher performance pin for pin replacement...

I agree, a multi-channel S/H is not rocket science ;^)

H^) harry

Tim Ressel wrote:

> I just used 4051s, lm324s and 0.1uF caps for my 8-chan
> version. Seems to work fine.
>
> --TR
>
> --- Seb Francis <seb at is-uk.com> wrote:
> > Seb Francis wrote:
> >
> > > I couldn't fine any S&H arrays from my normal
> > suppliers - maybe I was searching for the wrong
> > name.  Can anyone recommend any?
> >
> > sorry, forget this question .. I found them now!
> > was too late at night when I was looking before ;)
> >
> >
> >
>
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