The 74AC175 can not be subituted as the circuit needs the higher voltage
output, contact me off list if you need a few parts, or use the surface
mount PC board as these parts are still around. See options here :
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
Stanley
----- Original Message -----
From: "Azelio Boriani" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Sunday, December 11, 2011 2:15 PM
Subject: Re: [time-nuts] Subs for obsolete chips in pictic
Better use 74HC or 74HCT parts, the 74F should be TTL FAST parts that
require high input current to be driven correctly.
On Sun, Dec 11, 2011 at 9:04 PM, Chris Albertson
<[email protected]>wrote:
Looking at the picric II schematic. Trying to decide on the bet
substitute parts for some obsolete parts.
It uses a few 74ACxxx locic family parts that are no longer made. I
think the "74H" or "74F" series should work What do you think? I may
have to adapt an SMD part. They have to work on 5V supply and the
clock is 10MHz. There is also a discontinued op amp but they are
easy to sub.
--
Chris Albertson
Redondo Beach, California
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