[time-nuts] Subs for obsolete chips in pictic
timenuts at n4iqt.com
Sun Dec 11 15:38:33 EST 2011
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 :
----- Original Message -----
From: "Azelio Boriani" <azelio.boriani at screen.it>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
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
> <albertson.chris at gmail.com>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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