Search found 1746 matches

by dyarker
Wed Sep 01, 2004 9:21 pm
Forum: General Discussion
Topic: GFCI question
Replies: 11
Views: 4196

Re: GFCI question

Codes vary city to city, but I've never heard of non-metalic boxes being legal before 3 wire cable became mandatory. Maybe they're replacements.<p>My mother's house is over a 100 years old. The wires, as you said, are insulated with braid. The outer jacket is spiral steel. The upgrade to 3 prong out...
by dyarker
Wed Sep 01, 2004 8:05 pm
Forum: General Discussion
Topic: Stray 110 voltage
Replies: 16
Views: 7794

Re: Stray 110 voltage

With the source neutral open, the loads on the two 115V phases are in series, with 220V on them. Loads on the phases are seldom exactly equal. The neutral line is then just the voltage divider point between the loads. It was probably 50-50 that the motor didn't move versus burn up/blow fuse.<p>Had a...
by dyarker
Wed Sep 01, 2004 1:34 am
Forum: General Discussion
Topic: gear counter
Replies: 6
Views: 2902

Re: gear counter

Is the sequence 1 (half) N (half) 2 - 3 - 4 - 5 ?<p>That'll makes things a little more complicated.
by dyarker
Wed Sep 01, 2004 1:28 am
Forum: General Discussion
Topic: Stray 110 voltage
Replies: 16
Views: 7794

Re: Stray 110 voltage

DEFINITELY DO NOT connect the neutral that comes out of the GFI to any other neutrals (neither from a non-GFI circuit, nor from a different GFI). The possible imbalance in return current will cause false GFI tripping.<p>In any case the wiring should look like a tree. Branches are okay, but branches ...
by dyarker
Mon Aug 30, 2004 8:29 pm
Forum: General Discussion
Topic: Stray 110 voltage
Replies: 16
Views: 7794

Re: Stray 110 voltage

"What is strange to me, is the stray digital voltage at the junction box was 5 volts and now at the fountain 25 feet away it is 1.3. Strange."<p>With black open (power off), the black wire at the pump its a 25ft. antenna. At the junction box its a 50ft. antenna. At the pump is less than ha...
by dyarker
Sun Aug 29, 2004 6:27 pm
Forum: General Discussion
Topic: Need low cost torrids
Replies: 27
Views: 8769

Re: Need low cost torrids

Bleed the caps first.<p>(thanx Edd - fixed the spelling at link. (The knighthood came through and nobody told me? :) ))<p>[ August 29, 2004: Message edited by: Dale Y ]</p>
by dyarker
Sun Aug 29, 2004 12:48 am
Forum: General Discussion
Topic: Need low cost torrids
Replies: 27
Views: 8769

Re: Need low cost torrids

A Hammond 182T24 , 48VCT, 13.02A toriod transformer is 6.1 inches outside diameter, 3.1 inches high, 10.38 pounds.<p>Perhaps you where thinking a toriod would be smaller than a regular transformer because the toriods in switching supplies (like in PCs) are small. The difference is that switching sup...
by dyarker
Sat Aug 28, 2004 6:08 am
Forum: General Discussion
Topic: Need low cost torrids
Replies: 27
Views: 8769

Re: Need low cost torrids

Did you tell them 60Hz "120VAC primary, 40VCT 10A secondary"?<p>If you did, then $65 is cheap. The thing must be half the size of a soccer ball! (if you mean a line transformer.)<p>[ August 28, 2004: Message edited by: Dale Y ]</p>
by dyarker
Wed Aug 25, 2004 5:00 am
Forum: General Discussion
Topic: Temp guage for car
Replies: 28
Views: 11570

Re: Temp guage for car

Is there a temperature gauge on the dash, or is it just an over-temp idiot light?<p>If idiot light, you might have to change the sender. -------------------------------- With a linear sender where the voltage goes lower for higher temps; you would need an op amp to invert and scale the voltage, an a...
by dyarker
Sun Aug 22, 2004 11:03 pm
Forum: General Discussion
Topic: PIC-LCD Interface
Replies: 7
Views: 3385

Re: PIC-LCD Interface

Put AN587 in search box at www.microchip.com and got: http://www.microchip.com/stellent/idcp lg?IdcService=SS_GET_PAGE&nodeId=1999&ty=&dty=&section=&NextRow=&ssUserText=AN587&DesignDocSelect= The second entry "AN587 Source Code" is a zip file containing the file...
by dyarker
Sun Aug 22, 2004 5:30 pm
Forum: General Discussion
Topic: PIC-LCD Interface
Replies: 7
Views: 3385

Re: PIC-LCD Interface

Have searched the Microchip App Notes?
by dyarker
Sat Aug 21, 2004 10:07 pm
Forum: General Discussion
Topic: Offset voltage on voltage follower
Replies: 19
Views: 9566

Re: Offset voltage on voltage follower

I think I've got a mental block over this and maybe can't be of assistance.<p>"Currently i have a 0 - 5V transducer and it keeps breaking. I have now found a 0.5 to 3.5v tranducer which is more robust and dosnt break. Therefore im trying to fall (fool) the reading system , so it thinks its read...
by dyarker
Fri Aug 20, 2004 5:50 pm
Forum: General Discussion
Topic: Offset voltage on voltage follower
Replies: 19
Views: 9566

Re: Offset voltage on voltage follower

I'm confused! Are we reading the transducer, or driving the transducer???<p>Read the posts. It does say "sort of" output TO new transducer 0.5 to 3.5. But if this is the case, what does the 1K load have to do with anything??<p>It might help if I knew what that transducer was.<p>Cheers,<p>[...
by dyarker
Fri Aug 20, 2004 4:33 am
Forum: General Discussion
Topic: Offset voltage on voltage follower
Replies: 19
Views: 9566

Re: Offset voltage on voltage follower

From transducer to op amp non-inverting input a resistor 20 to 50 times the transducer impedance.<p>The feedback resistor (op amp output to inverting input) a resistor 5/3 the value the transducer input resistor. This sets gain so 3V swing of new transducer becomes a 5V swing out. 0.5V * 5 / 3 = 0.8...
by dyarker
Thu Aug 19, 2004 9:04 pm
Forum: General Discussion
Topic: OPNIONS WANTED sounds too good to be true
Replies: 80
Views: 38902

Re: OPNIONS WANTED sounds too good to be true

I've got no problem with hydrogen and electric vehicles for the environment. It is the "less energy" claims that are BS. The actual energy consumption goes up some, but a central electric or hydrogen plant can be made cleaner than a vehicle engine. For one thing weight isn't a concern. The...