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Old 10-18-2006, 12:50 PM   #46
the_gr8t_waldo
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just a small q here, did you consider wireing the garment useing a few parallel circuts( 4 would be my ideal) that way when one breaks there would be some heating still going on. length would have to be adjusted so that the total resistance would still be the same as the single wire garment.
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Old 10-18-2006, 04:10 PM   #47
ZZR_Ron
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kerhonky

You have my apologies, I guess I overreacted. One of those days, it's been grey and miserable here for about a week, and I guess my mood is showing!

Yes, that kit you found will work just fine, slightly less efficient, because it doesn't have the super lower resistance FET, and a bit bigger because of the heat sink etc.

I actually build them for about 5 bucks worth of parts, not including the case, but my wife works for an electrical contractor, and gets me a deal.
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Old 10-19-2006, 06:27 AM   #48
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Quote:
Originally Posted by ZZR_Ron
You have my apologies, I guess I overreacted. One of those days, it's been grey and miserable here for about a week, and I guess my mood is showing!

Yes, that kit you found will work just fine, slightly less efficient, because it doesn't have the super lower resistance FET, and a bit bigger because of the heat sink etc.

I actually build them for about 5 bucks worth of parts, not including the case, but my wife works for an electrical contractor, and gets me a deal.
No biggie, dude. My post could have been written more clearly to avoid the misinterpretation.

From what I could find, most of the parts are only a quarter a piece or so. It's that big 500R resistor, the MOSFET and the circuit board that cost the dough.

Hey, if you build them for $5, I'd be happy to buy one from you for $10. Or just the parts, even.
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kerhonky screwed with this post 10-19-2006 at 06:41 AM
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Old 10-19-2006, 07:24 AM   #49
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The 500 ohm resistor isn't a high wattage one. it's about 10 cents to buy. The Mosfets are about 80 cents Canadian.(the most expensive part) I buy the circuit boards at radio shack, about 5 bucks each, but each board builds 8 controllers.

It wasn't about the cost though, I just wanted see if I could build one that works worth a damn.
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Old 10-19-2006, 07:46 AM   #50
Uncle Pollo
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Ok ... I think I will be buying a premade one ... too lazy.

But it would be really interesting to know if anyone has attempted to make an electric hand warmer inserts for gloves.

btw ... I am getting grip warmers on the mail next week.
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Old 10-19-2006, 07:57 AM   #51
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Quote:
Originally Posted by Vstrommancer
Ok ... I think I will be buying a premade one ... too lazy.

But it would be really interesting to know if anyone has attempted to make an electric hand warmer inserts for gloves.

btw ... I am getting grip warmers on the mail next week.

I used an old pair of grip warmers that had lost their "stick" inside a pair of gloves. I had to wire them in series, they only pulled about 10 watts, but would just about cook your hands! If you wire them normally, they'll literally burn you.
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Old 10-19-2006, 08:21 AM   #52
kerhonky
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Quote:
Originally Posted by ZZR_Ron
The 500 ohm resistor isn't a high wattage one. it's about 10 cents to buy. The Mosfets are about 80 cents Canadian.(the most expensive part) I buy the circuit boards at radio shack, about 5 bucks each, but each board builds 8 controllers.

It wasn't about the cost though, I just wanted see if I could build one that works worth a damn.
I guess those of us who aren't experienced in reading electrical schematics need some more specifics, then. When I Googled "500R resistor" I got a $7 item. Can you provide some sort of parts list, because I'm obviously not reading your diagram correctly.

I'm definitely still interested in trying this, but it's sounding a lot like I won't even have the right parts, much less be able to assemble them correctly. And for me, it is partly about cost. The pre-made controller is $18 plus $10 shipping. If I can make one for $10 I'd love it. But if I wind up buying the wrong parts and either ruining them or having to take them back, now I'm just trading cost savings for aggravation.
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Old 10-19-2006, 09:01 AM   #53
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If I could have bought the thing for 18 bucks I would have as well!

By the time I get anything out of the "States and into Canada, it costs
me more than double.

I should have corrected my schematic, that resistor should be a
470 ohm, 1/4 watt. My wife get them for me for 3 cents each, when I buy 100. I'm always playing with electronics and stuf, so like to have lots of spare parts around!!
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Old 10-19-2006, 09:17 AM   #54
kerhonky
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Quote:
Originally Posted by ZZR_Ron
If I could have bought the thing for 18 bucks I would have as well!

By the time I get anything out of the "States and into Canada, it costs
me more than double.

I should have corrected my schematic, that resistor should be a
470 ohm, 1/4 watt. My wife get them for me for 3 cents each, when I buy 100. I'm always playing with electronics and stuf, so like to have lots of spare parts around!!
OK, next question: where the hell does the knob go? After looking at the parts I found online, none of them even look big enough to harbor such a knob, much less have a post on which to put it. Is one of the resistors variable, and I once again have found the wrong one?

Sorry for all the questions, but expect them to keep coming until you tell me to fuck off and sign up for an electronics course.
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Old 10-19-2006, 10:34 AM   #55
xtphreak
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Quote:
Originally Posted by Vstrommancer
Ok ... I think I will be buying a premade one ... too lazy.

But it would be really interesting to know if anyone has attempted to make an electric hand warmer inserts for gloves.

btw ... I am getting grip warmers on the mail next week.
well I have some heated liners, but the company has been absorbed by gerbings
so I can't offer a source

basically they're a pair of poly liners with a heating element (small diameter wire type) that is sewn into the seam and follows the outline of the hand, up one side, up and down the side of each finger & the thumb and down the other side.

think putting your hand on a piece of paper and drawing the outline like you did when you were 5.

don't know why you couldn't make a set, they draw about 15 watts the pair so 7.5 watts per hand

P=IE (Power = Current in Amps * Voltage)

7.5 w = I * 12

7.5 / 12 = 0.625 A

E=IR (Voltage = Current * Resistance)

E/I = R

12V / 0.625A = 19.2 Ohms

each glove insert will need 19.2 ohm resistance



I pull mine on under unlined gloves and do fine down below 30 deg F on the XT600 with wind guards

or in my insulated golves they are down right toasty
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Old 10-19-2006, 10:41 AM   #56
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Quote:
Originally Posted by kerhonky
OK, next question: where the hell does the knob go? After looking at the parts I found online, none of them even look big enough to harbor such a knob, much less have a post on which to put it. Is one of the resistors variable, and I once again have found the wrong one?

Sorry for all the questions, but expect them to keep coming until you tell me to fuck off and sign up for an electronics course.
the pot
the 47K ohm
you need a 12mm panel mount, a 50K ohm should work too
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Old 10-19-2006, 10:42 AM   #57
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I saw somewhere else on the net where someone had made a penny-tech 'heated vest' by taking a bargain-store T-shirt and cutting it open down the front, sewing some velcro on to close it back up; then he hot-melt glued his ~28ga heater wire all around on the outside of the shirt. I wondered whether the hot-melt glue wouldn't melt from the heat of the wire, but by his report it held together just fine. So why not take a pair of cheap poly gloveliners and glue some wires around the outside?
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Old 10-19-2006, 11:06 AM   #58
kerhonky
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Quote:
Originally Posted by xtphreak
the pot
the 47K ohm
you need a 12mm panel mount, a 50K ohm should work too
Ah.

So why isn't the symbol for a potentiometer different than the one for a resistor? I know a pot is just a variable resistor, but how's a dumbass like me supposed to know it's a pot instead of a resistor?
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Old 10-19-2006, 11:07 AM   #59
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Kerhonky, XT Freak answered your question.

XT, did you ever build yourself a controller?

Gringo, I don't know if you can buy heated seat cushions for cars down there,
but that's where I got my heated panels from. I bought the heated car seat from WalMart for 8 bucks.

It's rated at 50 watts. As a matter of fact I'm going riding in a few minutes, and intend put it on. It's -1 here (30F)
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Old 10-19-2006, 11:54 AM   #60
xtphreak
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Quote:
Originally Posted by ZZR_Ron
Kerhonky, XT Freak answered your question.

XT, did you ever build yourself a controller?

Gringo, I don't know if you can buy heated seat cushions for cars down there,
but that's where I got my heated panels from. I bought the heated car seat from WalMart for 8 bucks.

It's rated at 50 watts. As a matter of fact I'm going riding in a few minutes, and intend put it on. It's -1 here (30F)
nope

no time

still using a roller type in-line lamp switch with a radio shack LED for indication

I think maybe I'll build one when it gets too cold to ride

maybe

or I might go by radio shack and pick up parts tomorrow .... no telling with me
you sent me the schematic like last year wasn't it?


Kerhonky

the symbol for a pot IS different than a resistor

look at the THIRD leg

see the arrow pointing to the resistor symbol?

that's the WIPER in the pot that moves along the resistor and varies the resistance
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