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Old 06-26-2005, 01:48 AM   #11
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ok so i got (12-3.3)/30 = 0.29

that site gave me
Calculated Limiting Resistor
58 OHMS
Nearest higher rated 10% resistor
68 Ohm
Calculated Resistor Wattage
1.305 WATTS
Safe pick is a resistor with
power rating of
2.175 WATTS

im still not sure which restistors to get or even what values they come in.
JProx do you know of any sites i could order everything from?
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Old 06-26-2005, 03:00 AM   #12
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are these what i need?
http://www.digikey.com/scripts/dksea...449062&Site=US
and would this work for a pot?
http://www.digikey.com/scripts/DkSea...141710&Site=US
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Old 06-26-2005, 06:43 AM   #13
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.8/20=.04 to get 40 you would have to multiply by 1000...
according to that you would need 290ohms..ACK something is off with that?

I would assume they were giving you the numbers in wich they are made with the safe part to use..

Why not use a 4V source?
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Old 06-26-2005, 01:29 PM   #14
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i guess i'll get a 4v ps
4.667 OHMS
Nearest higher rated 10% resistor
4.7 Ohm
Calculated Resistor Wattage
0.105 WATTS
Safe pick is a resistor with
power rating of
0.175 WATts
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Old 06-27-2005, 04:00 AM   #15
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i said 20ma (thats milli - amps) which means its .020a
you guys just made a small calc error, happens all the time, and it was my fault for not making that clear earlier, so i am sorry about that.

milli is 3 places behind the decemil (shorthand m)
micro (shorthand is u, as in uA, the true symbol is really the greek letter ยต but u is fine) is 6places behind,
nano is next (shorthand n) and its 9places behind,
and then peco (shorthand p) is 12 places behind.

those notations are always used for electronics, and are used for volts, amps, resistors (if ever) or watts.

12v source
12-3.3 = 8.7/20ma = 435ohms.

or the 4v source
4 - 3.3 /20ma = 35ohms.

i would suggest you go to radio shack to get your resistors and pot. they might be a little costly but its easier to do returns if you break something, or if you need more of something, and plus the difference in price + shipping is usually about equal to radioshack. the expection to this idea is leds, and some higher function digital and analog ic's.

its a little silly to buy 5 resistors and a pot from digikey, reistors are about 5cents a peice and a pots are usually under 2 bucks for a large ohm range, radioshack should charge you about 1 dollar for pack of 5 reistors and 1.50 - 2 for the pot.

anyway sorry for hte late reply, went over a friends house for a cookout, the food was great, but the company kept me out all night. lol if you need some more theory or advice just let me know.
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Old 06-27-2005, 04:03 AM   #16
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what about the switch? im not finding anying when i search for them?
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Old 06-27-2005, 12:55 PM   #17
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i guess i'll get a regular switch, what kind should i get?
im also not seeing the right resistors and pot onthe radioshack site. will they have them at the store?
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Old 06-27-2005, 12:56 PM   #18
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again get it at radioschack, they have large selectiobn of switches, and you can choose the one you like the best, from their inventory.
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Old 06-27-2005, 01:07 PM   #19
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will they have more that whats listed on thier site? i didnt see the right resistors or pot
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Old 06-27-2005, 01:52 PM   #20
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i know they have the pots, and resistors in store. i have purchased those items from them a donzen times.
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