[sdiy] Daffy CMOS ASCIImatic

[Scott Gravenhorst]

=?iso-8859-1?Q?Ren=E9?= Schmitz <uzs159 at uni-bonn.de> wrote:
>Hi Scott!

Hi René!

>If you run the analog out into a load that is connected to=20
>half the supply voltage it could work. 

Or a dual supply, +/- 7.5 Volts  and then the load goes to 
ground ?

>I'd try yet another=20
>invertor with a feedback resistor (or maybe an opamp), 

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

>and=20
>tie the analog output directly to the input.=20

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?

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?


>At 18:05 28.04.02, Scott Gravenhorst wrote:
>>I thought a picture might be worth some words....
>>
>>            100 K               100 K
>>  cv=20
>>  o--+--/\/\/\/\/-----+------/\/\/\/\/-----+
>>     |                |                    |
>>     |                |     |\             |
>>     |                |     | \            |
>>     |                |     |  \           |
>>     |                +-----|   >O---------+
>>     |                      |  /           |
>>     |         4007 CMOS    | /            | 10
>>     |          inverter    |/             |=20
>>     |                                  -------
>>     |                               11 -  -  - 12
>>     |             analog               |  |  |       analog
>>     |               in    >-------+----+  v  +----+--> out
>>     |                             |               |
>>     |                             |               |
>>     |                             +----+  |  +----+ =20
>>     |                                  |  v  |
>>     |                                4 -  -  - 5
>>     |                                  -------
>>     |                                     |
>>     +-------------------------------------+ 3
>>                                 Transistors from 2nd 4007.
>>
>>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D =20
>>- Government: The other religion.
>>- The media's credibility should always be questioned.
>>- Lambs who lie down with lions are lunch.
>>
>>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>>-- Linux Rex         | RedWebMail by RedStarWare
>>-- FatMan: home1.GTE.NET/res0658s/FatMan/
>>-- NonFatMan: home1.GTE.NET/res0658s/electronics/
>>
>>
>>
>--=20
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>
>=20
>

=========================================================  
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/FatMan/
-- NonFatMan: home1.GTE.NET/res0658s/electronics/