[time-nuts] FEI-565A part

2007-02-05 Thread geraldm
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

Re: [time-nuts] FEI-565A part

2007-02-05 Thread Javier
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

Re: [time-nuts] FEI-565A part

2007-02-05 Thread geraldm
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

Re: [time-nuts] FEI-565A part

2007-02-05 Thread Bill Hawkins
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)??

Re: [time-nuts] FEI-565A part

2007-02-05 Thread Jack Hudler
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

Re: [time-nuts] FEI-565A part

2007-02-05 Thread Javier
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

[time-nuts] Looking for INFO - Datum 9100-6065 Time Code Generator

2007-02-05 Thread Tom E. Miller
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

Re: [time-nuts] TADD-1 Design (was Re: Stepping up the output of an OCXO

2007-02-05 Thread Dr Bruce Griffiths
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

Re: [time-nuts] Looking for INFO - Datum 9100-6065 Time Code Generator

2007-02-05 Thread Bill Hawkins
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.

Re: [time-nuts] 75Z vs 50Z for GPS receivers

2007-02-05 Thread Didier Juges
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!

Re: [time-nuts] 75Z vs 50Z for GPS receivers

2007-02-05 Thread Dr Bruce Griffiths
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

Re: [time-nuts] 75Z vs 50Z for GPS receivers

2007-02-05 Thread Brooke Clarke
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

Re: [time-nuts] 75Z vs 50Z for GPS receivers

2007-02-05 Thread Didier Juges
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