TDA1008 (was: Re: LF411 Op-Amp dilemma)

[Jim Shearer]

In message <32F0F1C9 at MSMGATE.M30X.NBG.SCN.DE>, Haible_Juergen#Tel2743
<HJ2743 at denbgm3xm.scnn1.msmgate.m30x.nbg.scn.de> writes
>
>
>> -------------------- Tone Generation Scheme ------------------
>[...]
>> Jim Shearer
>
>Very good description !
>
Thanks!

>Yes. Another string synth which has individual envelope shaping
>for each note is the Korg Lambda. But this one doesn't use 1008's,
>but discrete diodes which act as voltage controlled resistors. But the
>1008 has a better envelope shape; you always get an unnatural
>release "tail" with discrete diodes. They avoided the "tail" in the
>Lambda by restricting the release time with a resistor in parallel
>to the diodes. I found out about that when I had cut off all these
>resistors in an attempt to increase the maximum Release time,
>and thenm had to solder them all in again. (&%$%&$& !)
   Ah, interesting. I never worked on the Lambda. Maybe replacing every
resistor with a constant-current sink/source would do the trick! :-)

>But I disgress.
>A funny thing about the Crumar Performer is that is uses a
>*mixture* of the both methods individual/global envelope.
>If you only select the Strings sound, the 1008's produce the
>envelopes. But if you switch on the Brass section as well,
>the Attack and Release times of the 1008's are set very short,
>and the String sound is routed thru a separate CA3080 VCA
>with one global envelope. No more release for the strings
>then, and only the first notes have a slow attack, but later ones
>just "jump" in, if a chord was held and additional notes are
>played.
  Yes, this was a great shame. I never rated the bass section
personally. Just used the strings.
>
>JH.

-- 
Jim Shearer