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From: Jan Panteltje on 13 Apr 2010 13:35
On a sunny day (Tue, 13 Apr 2010 06:51:40 -0700 (PDT)) it happened MooseFET
<kensmith(a)rahul.net> wrote in
<8993a5de-5d8a-4765-8b19-9edb8d4d9bbf(a)w17g2000yqj.googlegroups.com>:

>How about:
> +5
> !
> +5 [R]
> ! !
> [R] +---------- Out
> ! !/c
> +-------! NPN
> ! !\e
> !/e ---[R]--
> ----! PNP e\!
> !\c !----+---!<----[LT1004-2.5]---GND
> ! /! !
> -8V ! ----[R]--- -8
> -8
>
>
>It inverts but it also shifts

Yes, but for a scope inverting is not good ;-)


>For a JFET circuit a dual like the SST440 may be the way to go.
>You could use the second one to compensate for the Vgs of the first.

Indeed.


From: Tim Williams on 13 Apr 2010 13:47
"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message
news:hq2a1s$j6s$1(a)news.albasani.net...
>>It inverts but it also shifts
>
> Yes, but for a scope inverting is not good ;-)

Pfft, just

comf data,1

Or if you don't have time to explicitly negate the operand, rearrange your
display so zero is at the bottom of the screen, increasing upwards. Then it
will be mathematically correct, too ;-)

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms


From: Jan Panteltje on 13 Apr 2010 14:55
On a sunny day (Tue, 13 Apr 2010 12:47:30 -0500) it happened "Tim Williams"
<tmoranwms(a)charter.net> wrote in <hq2anm$ucs$1(a)news.eternal-september.org>:

>"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message
>news:hq2a1s$j6s$1(a)news.albasani.net...
>>>It inverts but it also shifts
>>
>> Yes, but for a scope inverting is not good ;-)
>
>Pfft, just
>
>comf data,1
>
>Or if you don't have time to explicitly negate the operand, rearrange your
>display so zero is at the bottom of the screen, increasing upwards. Then it
>will be mathematically correct, too ;-)

Yea, if you had read my report on doing the display driver for the LCD19-Samsung,
I mentioned that I had to write a lot of code to make it work from right ot left
to bottom up :-)
It is not so simple, but there exists a simple solution: Stand on your head,
and you can flip right left too with a mirror.
Or use an old analog video camera and reverse the scan.
Or reverse the scan on the CRT...
If all that fails move to Australia.



>
>Tim
>
>--
>Deep Friar: a very philosophical monk.
>Website: http://webpages.charter.net/dawill/tmoranwms
>
>
>
From: JosephKK on 14 Apr 2010 01:11
On Tue, 13 Apr 2010 17:35:49 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote:

>On a sunny day (Tue, 13 Apr 2010 06:51:40 -0700 (PDT)) it happened MooseFET
><kensmith(a)rahul.net> wrote in
><8993a5de-5d8a-4765-8b19-9edb8d4d9bbf(a)w17g2000yqj.googlegroups.com>:
>
>>How about:
>> +5
>> !
>> +5 [R]
>> ! !
>> [R] +---------- Out
>> ! !/c
>> +-------! NPN
>> ! !\e
>> !/e ---[R]--
>> ----! PNP e\!
>> !\c !----+---!<----[LT1004-2.5]---GND
>> ! /! !
>> -8V ! ----[R]--- -8
>> -8
>>
>>
>>It inverts but it also shifts
>
>Yes, but for a scope inverting is not good ;-)
>
An inversion at the circuit level is not necessarily an inversion at
the system level; especially for a software driven system.
>
>>For a JFET circuit a dual like the SST440 may be the way to go.
>>You could use the second one to compensate for the Vgs of the first.
>
>Indeed.
>
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