Nortons (was: Re: Wave Wraper revisited #1)

[Rene Schmitz]

At 13:58 25.06.99 -0500, Grant Richter wrote:
>2. Current Controlled Integrator. If you build and integrator around
>a LM3900, the integrator will ramp positive for current into the
>positive terminal, and negative for current into the negative terminal,
>and stay at the last voltage level for no current into either terminal.
>Thats pretty much the heart of a linear envelope generator.
>CMOS switches can be used to switch the currents
>into the various terminals for the ADSR functions and a
>voltage comparator sets the peak value.

That is essentially what I did in my VCADSR.
The control logic switches the current from an expo convertor to either or
no terminal. But the current source must source from a voltage higher than
GND, 
thus I added a current mirror, and could operate the LM3900 from a single
supply.


Bye 
 René


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