[sdiy] Daffy CMOS ASCIImatic

[René Schmitz]

At 19:07 28.04.02, Scott Gravenhorst wrote:
>Or a dual supply, +/- 7.5 Volts  and then the load goes to 
>ground ?

Right, something like that.

>I thought about this, couldn't figure why...  I assume you
>mean to use the 2nd linear inverter like a cv preamp to this?

The output of the "switch" would be run directly into the 
inverting input of that invertor.

>I don't get this.  Which input and why?  CV in?  I've seen 
>this in single transistor units (drain to gate) but it's 
>coupled with a resistor.  Is this a linearity improvement?

If one uses such a configuration, the output of the two MOSFETs is 
held at a constant potential. This should improve linearity.

>Also, I looked at this again, and I think that if only one inverter
>is used, this can be made out of one 4007.  Powering it will have no
>effect on protection diodes turning on.  Only an analog signal out
>side of the rail-rail boundarys would cause problems.  Also I think
>the other pair of transistors could make another VC resistor that
>reponds reverse of the first.  VC pot?

That would be interesting.

Cheers,
 René




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