Search found 38 matches

by Ed B.
Tue Apr 08, 2008 10:30 am
Forum: General Discussion
Topic: Flourescent emergency lights
Replies: 2
Views: 995

Pete,
Thank you for your reply. The small schematic on the body of the device kinda led me to believe that there wasa no external battery and that it was fed from an "Unswitched Source."
Your explanation clears up a lot in my head.
TNX again.
Ed B.
by Ed B.
Sun Apr 06, 2008 10:33 pm
Forum: General Discussion
Topic: Flourescent emergency lights
Replies: 2
Views: 995

Flourescent emergency lights

Question - In the sanctuary of my church in a line-up of flourescent lights along the side walls - are a couple of tubes on each side that remain lit when the main circuit breaker is shut off. Investigating those tubes that remain lit I find what looks like a second ballast. It is about the same siz...
by Ed B.
Fri Mar 14, 2008 9:06 pm
Forum: General Discussion
Topic: Formulas & triangles...
Replies: 21
Views: 4387

All -

How about these.

The MAGIC word learned in High School math..SOHCAHTOA

Soh - Cah - Toa

SINE = Opposite over Hypotenuse SOH
Cosine = Adjacent over Hypotenuse CAH
Tangent = Opposite over Adjacent TOA


An old timer.
by Ed B.
Mon Nov 26, 2007 8:24 pm
Forum: Up For Grabs
Topic: various large power supply caps. FREE
Replies: 10
Views: 5070

dacflyer -
What makes a capacitor - "COMPUTER GRADE" ?
I have never received a satisfactory answer to this question.

Ed B.
by Ed B.
Tue Oct 02, 2007 7:25 pm
Forum: General Discussion
Topic: Ford F-250 back up alarm
Replies: 8
Views: 2364

frhrwa Go to Rat Shack and buy a "PIEZO BUZZER" - 12 volt or better-and connect it (1) to the wire going to the 'back-up (White) light and (2) the other wire to a good ground. Mount the buzzer with epoxy glue somewhere on a rear quarter panel (at the rear of the truck). When the white back-up light ...
by Ed B.
Mon Aug 06, 2007 4:30 pm
Forum: General Discussion
Topic: Shipping and Handling
Replies: 9
Views: 1646

Guys - Thanks for your replies. My 'shopping list' was just a 'made-up' example of a small order. I do not need that specific list of items. For some small projects I do use Radio Shack (when they carry specific needs). My location is about 45 miles North of Tampa. My last construction item used 6 v...
by Ed B.
Sun Aug 05, 2007 8:22 pm
Forum: General Discussion
Topic: Shipping and Handling
Replies: 9
Views: 1646

Shipping and Handling

Hi All, I am a hobbyist. Sometimes I just need one or two 16 volt electrolytic caps - one or two resistors quarter watt - maybe two little transistors. All of the mail order places that I know want to charge me anywhere from 5 to 7 dollars for shipping and handling when the items weigh, at most, an ...
by Ed B.
Fri Aug 03, 2007 12:28 pm
Forum: General Discussion
Topic: mosfet substitution question
Replies: 1
Views: 691

mosfet substitution question

Hi All,

A substitution question...

Should I be able to substitute an IRF529 power mosfet for an MTP3055 power mosfet ?

They are being used in a low voltage (12 V) & linear operation.

Thanks for any reply.

Ed B.
by Ed B.
Tue Jul 31, 2007 7:40 pm
Forum: General Discussion
Topic: which way electrons??
Replies: 28
Views: 4132

All

Please then, explain current flow through the old vacuum tube. The plate had to be positive to attract the electrons from the cathode. Therefore the electrons flowed from negative to positive (outside the battery). How, if possible, did the "HOLES" proceed through the vacuum ?

Ed B.
by Ed B.
Tue Jul 10, 2007 7:48 pm
Forum: General Discussion
Topic: Passwords
Replies: 6
Views: 1217

Passwords

Ladies and Gentlemen, I thought that I read somewhere that using a word from the English language as a password - that a hacker could 'break the code' in a matter of minutes. How about using a word from our language but spell it backwards and alternate lower case and caps ?? Such as: "TfArCrIa" or "...
by Ed B.
Sat Jun 23, 2007 9:44 pm
Forum: General Discussion
Topic: O-scope waveforms
Replies: 6
Views: 1577

To rshayes

Prompt reply - That is exactly what I needed -thank you very much.

Ed B.
by Ed B.
Sat Jun 23, 2007 7:42 pm
Forum: General Discussion
Topic: O-scope waveforms
Replies: 6
Views: 1577

O-scope waveforms

My 76 year old brain is deteriorating and I need help. What is the proper spelling of the name of the guy (not an American) after whom various displays from an oscilloscope are named ? It is something like "liss-a-juice". I can't find him in the American Heritage Dictionary. Thanks for any help. Ed B.
by Ed B.
Tue May 29, 2007 8:27 pm
Forum: General Discussion
Topic: Credentials to call yourself an Engineer?
Replies: 22
Views: 4623

KTOMECEK First - I don't know what the connection is from the post just before mine and its relationship to your original question ? ? ? Second - When I was working in the telephone industry, a few people that I met would introduce themselves as an engineer. My reply to them would be - "Diesel, Stea...
by Ed B.
Mon Aug 28, 2006 1:43 pm
Forum: General Discussion
Topic: Turn signal "flasher" units
Replies: 11
Views: 3157

Dean -
Bad Ground ! Bad Ground ! somewhere.
Ed B.
by Ed B.
Sat Jun 24, 2006 9:59 pm
Forum: Up For Grabs
Topic: "WANTED" items ?
Replies: 2
Views: 2703

"WANTED" items ?

Hi -
Instead of parts/systems/etc. offered for sale...How about "WANTED" electronic/computer/ham items ? Or, would that be too much ?
Ed B.