AW: More Experiments - Envelope Generators this time...

Haible_Juergen#Tel2743 HJ2743 at denbgm3xm.scnn1.msmgate.m30x.nbg.scn.de
Thu Nov 23 20:15:00 CET 1995


The idea of using relays is nice.
I ran into the limited pot value problem as well. To make
it worse, I have only 2 values of these custom-made pots I use
im my Modular - 10kOhm and 100kOhm.
But unlike Gene, I have given up the idea of making the minimum
resistance as small as possible. From my former projects, I have
a little fear of strong current spikes in my system. Ok, a good ground
routing helps, and in case of capacitor charge a large local elko
to buffer the supply voltage does a great job, but anyway, I went
another direction. Just like the professional chips do, I use
Multipliers, OTA's in this case.
The big advantage is that You can get looong (5 minutes if You
like) time constants even with capacitors in the nF range.
The second advantage is that You can easily voltage control
the times (which is essential for me!), and implementing a simple
exponentiator (just two transistors; no matching, no opamp!)
gives control over an arbitrary number of decades with a simple
linear pot. In fact, I had to *reduce* the range after my first throw,
'cause the range that is possible from the electronics (maximum
OTA output current vs. leakage currents of the components) is
far greater than the limited sensitivity of my fingers to tweak the
knob into the right position would allow.
Now to the real thing: What I have built so far (with an LM13700,
= CA3080 x2), is just an *AR-Envelope*. AD-Envelopes would
not be a problem, too. ADSR envelopes could work similar,
but as an old Curtis article from Barry's Book shows, extreme
care must be taken for the offset voltages of OTAs then).
The circut for an AR is quite simple. I use two OTA's in parallel,
each with a diode at its output, to get separate control of A and D.
The inputs of the OTAs are hard wired together. As I wanted
linear slopes in that case, I used an Opamp as comparator to
overdrive the OTA inputs. For a RC-spape, You would use the
input stages of the OTAs themselves to compare the gate voltage
and the output voltage. With resistor dividers You take care not to
the OTA inputs. If You choose resistors in a way that the OTA is
*slightly* overloaded, You get a mixture of lin and RC-type response.
But take care that the OTA input voltage doesn't exceed +/-5V!
The whole thing makes an excellent slew limiter as well.
Originally, I used the internal buffer of the 13700, but here the
leakage currents are way too high. A FET stage or FET opamp
fixed the bug.
BTW, the RC networt at the output privides stability without the
sacrifice of accuracy You get with a simple series resistor
(important for slewing of VCO-CVs only).[[ AR_JH.GIF : 2958 in AR_JH.GIF ]]

JH.


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`
end



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