Hi all,
Have decided to get stuck into fault finding my 5650A again. With no replies
from FEI over the past 2 months, have decided to trace out the PCB the good
old fasioned way, however the only IC on the 1 inch square PCB PCB has me
completely lost.
So to the question, has any one ever come
Hello,
It is probably a TLC27M24BI quad opamp from Texas Instruments,
http://focus.ti.com/docs/prod/folders/print/tlc27m4b.html
Regards,
Javier, EA1CRB
[EMAIL PROTECTED] wrote:
Hi all,
Have decided to get stuck into fault finding my 5650A again. With no replies
from FEI over the past 2
Hi Javier,
I looked everywhere, Thanks. It looks like a match, you beauty.
Cheers
Gerald
-- Original Message --
Date: Mon, 05 Feb 2007 13:15:22 +0100
From: Javier [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject: Re: [time-nuts] FEI-565A
Google found a 27M4B1 SGS 93 2250 at electrospec.com.
Sadly, electrospec has no specs, just an RFQ form.
Bill Hawkins
-Original Message-
[EMAIL PROTECTED] asked,
So to the question, has any one ever come across a device
marking of 27M4Bl or possibly a bad i(I) not an L(l)??
Make sure you're seated, in an upright position, and have your wallet stowed
in a protected area prior to opening that RFQ reply.
That is if you even get one!
:)
Jack
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Bill Hawkins
Sent: Monday, February
The TLC27M4BI is widely available (Digikey, Mouser, Farnell, etc.) and
is a quite low-cost part, under a dollar.
Regards,
Javier, EA1CRB
Jack Hudler wrote:
Make sure you're seated, in an upright position, and have your wallet stowed
in a protected area prior to opening that RFQ reply.
That
A friend of mine gave me one of these that appears
to be working, it counts and we started it with
WWV but we don't really know what we have here.
He got several and got three of them working, at
least counting and putting out time codes.
We don't have any info or details of what else
they
Christopher Hoover wrote:
Agreed, that that regulator doesn't have sufficient margin for the entire
TADD-1.
I was suggesting using the low-noise high PSRR linear reg only to establish
the bias level.
There are indeed better parts. This one looks pretty good for an
integration solution
Tom,
I bought a dozen Datum and other time code generators in 2003.
Found manuals at Manuals Plus, link http://www.manualsplus.com/
The 9300 manual is about 3 thick.
I thought I could get three matched 9300s to display the time
from three atomic standards, sort of like what they have at WWV.
Bruce,
I finally found the time to google for avalanche pulse generator and
found an App note from Zetex on the subject.
I was not familiar with this technology, but it seems interesting.
Amazing that you can get 50A pulses with sub-ns rise time out of a
device in an SOT-23 (or TO-92) package!
Didier
Analog sampling scopes used avalanche transistors to drive the snap off
diode shorted delay line pulse generator which in turn drove the diode
sampling gate with picosecond risetime complementary pulses.
Bruce
Didier Juges wrote:
Bruce,
I finally found the time to google for
Hi Didiere:
There's also an app note at Linear Technology for making pulses so fast
they are used to calibrate sampling scopes.
Some years ago I made a very simple circuit that pulses a LED with many
amps (very short time) based on a transistor going into avalanche.
Have Fun,
Brooke Clarke
Hi Brooke,
I am familiar with the Jim Williams app note, but I felt the pulse shape
was somewhat lousy (based on the pictures that came with the article)
due to the very small cap on the collector, OK to calibrate or evaluate
a fast scope, I guess, but too far from a square wave to be able to
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