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post #1 of (permalink) Old 02-13-2001, 09:28 AM
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Electrically challenged

Well since itís about 8 degrees outside now and my CJ is stored for a long winter nap I thought I would try to work on the console Iíve been playing with. I need to figure out some resister formulas and I canít follow the basic electronics book I have. Do any of you know any good electronics hobby bbsís?
Thanks
p.s.- When Iím finished Iíll post the schematics.


'83 CJ7 258 i6 31x10.5 3in. lift? [img]/wwwthreads_images/icons/cool.gif[/img]
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post #2 of (permalink) Old 02-13-2001, 10:31 AM
 
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Re: Electrically challenged

go ahead and post your questions, others probably have the same questions on electrical issues. email me if you like,
big ed

[img]/wwwthreads_images/icons/cool.gif[/img] Big Ed
<font color=red>'88 YJ, 4" susp,3" body,35's,283 Chevy V8,TH350,4.11's,D30,D35c</font color=red>
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post #3 of (permalink) Old 02-13-2001, 10:40 AM
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Re: Electrically challenged

What are you having problems with exactly? If you have any questions, just drop me a line and I can give you a hand [img]/wwwthreads_images/icons/smile.gif[/img] I am an Electronics tech for the navy and am currently teaching Systems engineering at the Naval Academy (in other words I access to all of the Prof's and the people in my own community, probally a coupla thousand years of collective experience all together).

I do not know if these will help, I seem to always fall back on them when I forget things. [img]/wwwthreads_images/icons/smile.gif[/img]

http://www.tpub.com/neets/
Oh well good luck.

John
Damn the Mud!! Full speed ahead!!!
http://www.Marylandmudbugs.com

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post #4 of (permalink) Old 02-13-2001, 11:26 AM
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Re: Electrically challenged

<font color=blue>I am an Electronics tech for the navy and am currently teaching Systems engineering at the Naval Academy </font color=blue>

SQUID SQUID SQUID! Heh heh heh, do you know how many times we stole the goat? (Navy's mascot?) Oh what fun the rivalry was, I still have all my old BEAT NAVY paraphernalia. Working on a Navy Base is a little lax up here, no one gets into the spirit, kinda depressing.

USMA '92
Go Army, Beat Navy!

(All in good fun!)

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post #5 of (permalink) Old 02-13-2001, 11:35 AM
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Re: Electrically challenged

Yeah well you did ya know that "Bill" the goat originally belonged to the ARMY. Anyways we got a winning season this year (lost every game BUT the NAVY-army game)[img]/wwwthreads_images/icons/smile.gif[/img]

Boy ya shoulda seen the parties going on then [img]/wwwthreads_images/icons/wink.gif[/img]

GO NAVY

John
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http://www.Marylandmudbugs.com

post #6 of (permalink) Old 02-13-2001, 12:38 PM
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Re: Electrically challenged

Now that's what I'm talking about! Actually, Navy just assumed we owned the goat, we had it more than they did and it likes us better.

I have to say, that's one problem with Army, they always seem to screw up the A/N game, although I think the record is tied isn't it? Ah, no matter, I don't attend them, too far away and I don't know anyone down there anymore.

Thanks for the ribbing...all in good fun[img]/wwwthreads_images/icons/smile.gif[/img]

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post #7 of (permalink) Old 02-13-2001, 01:47 PM
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Re: Electrically challenged

I should have known you guys could figure out any problem. Hereís the nuts and bolts of it. I would also like to learn the formula so I can plug different numbers and get correct info. I want to draw off the CJís 12 volts and use resisters to bring the voltage down to 3v and 6v (or any other voltage). I have been playing around with a 6v battery and I noticed I can bring it down to 5v with four 1k Ohm resistors. The odd thing is it doesnít seem to make a big difference between the 1k Ohm resistors and the 100 Ohm resistors. Any ideas?
Thanks


'83 CJ7 258 i6 31x10.5 3in. lift? [img]/wwwthreads_images/icons/cool.gif[/img]
post #8 of (permalink) Old 02-13-2001, 03:08 PM
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Re: Electrically challenged

Sorry, I got us off track.

<font color=blue>What you're looking for is Ohm's Law (for DC current). The formula is:</font color=blue>

Current in Amps = Voltage (Volts)/Resistance (Ohms) = Power (Watts)/Voltage (Volts).

<font color=blue>Therefore by manipulating the equation, you can get different scenarios.</font color=blue>

Voltage = Current x Resistance
Voltage = Power/Current
Voltage = (Power x resistance)^0.5

Power = Current^2 x Resistance
Power = Voltage x Current
Power = Voltage^2 / Resistance

Resistance = Voltage/Current
Resistance = Power/Current

<font color=blue>You also asked about Resistors in series: </font color=blue>

Total resistance = Resistance1 + resistance2 + resistance3 + (you get the idea)

<font color=blue>Two resistors in parallel:</font color=blue>

Total Resistance = (resistance1 x resistance2)/(resistance1 + resistance2)

If you need any other formulas, I have a bunch of Physics links bookmarked, as well as many books of equations and data. Ask and ye shall receive.

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post #9 of (permalink) Old 02-13-2001, 03:31 PM
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Re: Electrically challenged

What are you trying to power with that 6v and 3v?
Have you thought about using a transformer with a tapoffs.
One of the big problems I have with using resistors to cause a voltage drop is Heat. Depending an the amount of current you put though them,you could possiblly burn the resistors up(or in Technical terms "let the smoke out")[img]/wwwthreads_images/icons/wink.gif[/img] and anything else in the area.
post your diagram and well try to give ya hand.



Whadda ya mean "lick test" the Maggie[img]/wwwthreads_images/icons/smile.gif[/img]

John
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post #10 of (permalink) Old 02-13-2001, 04:25 PM
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Re: Electrically challenged

O.k. I know the theory but Iím not sure how I can put it into the real world. I made this spreadsheet to hold some of the formulas Iíve been playing with. One is Ohmís Law. Letís say I have a 6v battery and I want to bring it down with resistors to use a 3v light what type of resistors do I need? I attached a simple diagram, please feel free to draw on it and send it back.
Thanks for all the help.


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