When repairing test equipment, computers, stereo's, the first
and always most likely component to need replacing is any electrolytic
capacitor.
Wavetek used a cheap capacitor made in Mexico in many of their
instruments. They all dry out over time, and become open circuits.
If you see the word
It is not clear from your post if you did that test while under power or
not.
This is probably a Rotary Optical Encoder. It may need 5V to power the LEDs
or light bulb that activate opto-sensors, so you probably need power applied
and use a scope to check the outputs. Also, some devices only
Hi Scott:
I've found with older equipment the most common by far problem is oxidized
electrical joints. Most of the time simply cycling all the connections will
restore operation. For more on that see: http://www.prc68.com/I/HaT.shtml
Have Fun,
Brooke Clarke
http://www.prc68.com/P/Prod.html
I have done the test under power with a logic probe with no pulses
either. Nevertheless,
this looks like a mechanical encoder, see the attached diagram from the
schematic. Only
3 connections, ground, and two switch outputs. The part is listed as
manufactured by WaveTek.
Any standardization
That seems to be the simplest, yet most effective way of doing what I need.
I'll try it.
Thanks for the help,
73, Dick, W1KSZ
-Original Message-
From: [EMAIL PROTECTED]
Sent: Apr 29, 2008 6:17 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 100 MHz Source
Hi Dick,
I think a very
LEDs been viable since at least the early 70's? Talk about planned
obsolescence...
How reliable were the early LEDs? When did they start to get used in high
reliability applications?
I remember getting a rack of memory for a PDP-10 that used LEDs because the
normal lights burned out all
In message [EMAIL PROTECTED], Hal Murr
ay writes:
LEDs been viable since at least the early 70's? Talk about planned
obsolescence...
How reliable were the early LEDs? When did they start to get used in high
reliability applications?
Many of them are still happily emitting their faint red
On Apr 30, 2008, at 18:56, Hal Murray wrote:
LEDs been viable since at least the early 70's? Talk about planned
obsolescence...
How reliable were the early LEDs? When did they start to get used
in high
reliability applications?
When I joined Hewlett-Packard in 1970, they made their
From: Poul-Henning Kamp [EMAIL PROTECTED]
Subject: Re: [time-nuts] LED reliability
Date: Wed, 30 Apr 2008 17:12:56 +
Message-ID: [EMAIL PROTECTED]
In message [EMAIL PROTECTED], Hal Murr
ay writes:
LEDs been viable since at least the early 70's? Talk about planned
obsolescence...
Quality and design still play a large factor as I replaced several 12V RV bulbs
with new White High-Intensity LEDs and they all failed within the first 60 days.
- Original Message
From: Poul-Henning Kamp [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
Mm LED operation is basically a bulk effect whereas the reliability of
transistors depends more on surface effects.
In 1960 ATT chose to go with Germanium, but the British Post Office chose
the new silicon planar technology for future submerged cables. Previously Dr
Gilbert Metson had written
Hal Murray [EMAIL PROTECTED] wrote:
LEDs been viable since at least the early 70's? Talk about planned
obsolescence...
How reliable were the early LEDs? When did they start to get used in high
reliability applications?
I remember getting a rack of memory for a PDP-10 that used LEDs
You can buy ROEs from companies like Avago (used to be the optical division
of HP).
They have relatively inexpensive models with up to 128 steps/turn. In many
cases (like my HP 3586A), more steps would be a very welcome addition. I
have obtained ROEs with 1000 steps/turn from a member on anothger
Interestingly, my company just received an RFQ for DC/DC converters for
trans-oceanic cables. Interesting specification. Among other things,
2,000,000 hours MTBF (the converters are multi-redundant) and, I like that
part, 100% altitude tested :-)
Something else you might find interesting: all
Dear time_specialists,
I try to get my FE 5652A up and running, so far I have found the following
connections / signals
on the 25 pin connector
pin 1 (and 21) + power supply
pin 8 (and 14 and 25) - power supply
I use around 15Volt for the unit to start working, just after power_on the
current
Hi Bruce,
I`ll include this in the several MB of reading I hope to do on this
subject! [I love succinctness! ],Don C.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Don Collie jnr wrote:
Hi Bruce,
I`ll include this in the several MB of reading I hope to do on this
subject! [I love succinctness! ],Don C.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
17 matches
Mail list logo
