http://ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic

http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:pictic


Hi guys,

I know there has been recent talk about this and it got me back into
building my PICTIC II boards.  I went through the parts list and created a
new copy that includes everything except U6, the 74AC175 chip that is out
of production.  Part ID numbers (C16, R8, etc) are listed as well.  For all
but one capacitor type I was able to squeeze these in the customer part
number field.  I'm not sure why there is such a jump in price.  It's now up
to just over $50.00.

https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=00D254588B
Accurate (to the best of my knowledge) as of 12/19/2011.

Wherever possible I used Richard McCorkle's part numbers as listed in his
BOM.  The Berg pin header was out of stock so I substituted it with a
similar version.  U7 was also substituted from PN# 595-74AC163E to PN#
595-CD74AC163EE4.

Q3, R24, and R25 are included.  These are for replacing U11 (MAX232) if you
want TTL IO instead of RS232.  Either drop U11 from your order or drop Q3,
R24, and R25.

U9 is included.  This is the PIC chip that I programmed for many of you.
If you have one, you can drop this from your order.


-Bob, N3XKB

...... added May, 2016  ......

http://www.ke5fx.com/pictic.htm


..... added May, 2016   .........

Only found info about PICTIC 1 and 2:

http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:pictic

Where´s info about PICTIC III?

Daniel

Em 13/05/2016 14:51, Attila Kinali escreveu:
> On Fri, 13 May 2016 07:36:10 -0400
> Bob Camp <kb8tq@n1k.org> wrote:
>
>> Given that a “real” TDC is a resistor and capacitor attached to a FPGA pin (plus the ADC)
>> the cost of doing it better is not all that much. You can get down to a few hundred ps without
>> a lot of crazy effort ( still using the MCU ADC).
> The PICTIC II did 250ps resolution with an effective resolution of 680ps[1].
>
> The upgraded version III had IIRC a resolution of ~25ps with better than 100ps
> achieved. Eventhough the PICTIC III design is a bit more involved than
> then II, it's still relatively simple (it uses more stable current sources,
> buffer opamps, external ADCs and an active offset compensation scheme).
>
>
>             Attila Kinali
>
> PS: Does anyone know what happend to Richard McCorkle? I haven't heard
> of him in ages.
>
> [1] http://www.ke5fx.com/pictic.htm