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Post by Gary Lecomte on Nov 20, 2008 8:23:56 GMT -8
"One could modify the circuit to use solid state switching instead of a relay , but that would require re- arranging the circuit board to allow for a beefy heat sink. Relays may be low tech, but they are easy to replace, if damaged". rmeyn
With some of the Newer Mosfets, it wouldn't require a very big Heatsink. Replacement is also Easy if needed. And overall Cost is Much lower.
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Post by Deleted on Nov 21, 2008 23:04:45 GMT -8
I would like one of the boards as I am unable to do the etching and such, I am alright with the soldering part and the 1 watt 300-500 resistors please let me know how to get ahold of you. Gary I would like to know the best way you have around the relay setup, or have you got another kit idea in mind! THANKS for all the help guys. Phil
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Post by Gary Lecomte on Nov 22, 2008 7:02:14 GMT -8
I would like one of the boards as I am unable to do the etching and such, I am alright with the soldering part and the 1 watt 300-500 resistors please let me know how to get ahold of you. Gary I would like to know the best way you have around the relay setup, or have you got another kit idea in mind! THANKS for all the help guys. Phil Hi Phil, I never persued this any further as it seems no one was interested. But I guess I could design up a board for it. Sorry am I Missing Something? (Re: 1 Watt 300 to 500 resistors?) Not sure What that refers to?
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Post by Deleted on Nov 22, 2008 13:14:12 GMT -8
Gary, Cool about the board. I was referring to Richard's post on the resistors he mentioned in a post 2,3,4 ? ago about load. (1/2 watt 300 ohm) instead of heater. THANK YOU, Phil
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Post by Gary Lecomte on Nov 22, 2008 13:33:01 GMT -8
Gary, Cool about the board. I was referring to Richard's post on the resistors he mentioned in a post 2,3,4 ? ago about load. (1/2 watt 300 ohm) instead of heater. THANK YOU, Phil It SAYS: 1/2 OHM, 300 Watt Resistors!NOT 1/2 Watt 300 Ohm. BIG DIFFERENCE HERE. A piece of "Nichrome" wire, (possibly from an old Hotplate) could be used for this. But you need some Porcelain Insulators and Good Air Flow. Gary
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rmeyn
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Post by rmeyn on Nov 22, 2008 13:54:06 GMT -8
Gary/Phil, The only reason I did not suggest a modification for solid state switching is time! I thought phil wanted to get this up and running quickly. As fas as cost-- you can go to nearly any wrecking yard and get automotive relays for very little. That is, if cost is a factor.
I've had difficulty expressing what I mean by a heater. I just suggested a 1/2 ohm 300 watt resistor. A large bank of 12 volt light bulbs might just do the trick. Again, maybe the auto wrecking yard is a good source. Richard
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Post by Deleted on Nov 22, 2008 15:13:33 GMT -8
That is right, I was trying to go from memory, just shows I can't remember very well either. I would be interested in both your boards and supplies to make them. I need price with shipping and insurance to 49644 Michigan USA and an address for paypal or mail. I have looked at Richard's board for some time but found the other controller and knew making the board was beyond my capabilities. I would like to know more about making/using the "Nichrome" wire also. Gary, I am sending you an email concerning PWM. THANK YOU BOTH, Phil
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Post by Gary Lecomte on Nov 23, 2008 7:51:56 GMT -8
That is right, I was trying to go from memory, just shows I can't remember very well either. I would be interested in both your boards and supplies to make them. I need price with shipping and insurance to 49644 Michigan USA and an address for paypal or mail. I have looked at Richard's board for some time but found the other controller and knew making the board was beyond my capabilities. I would like to know more about making/using the "Nichrome" wire also. Gary, I am sending you an email concerning PWM. THANK YOU BOTH, Phil I will see about Revising that Circuit, After I complete the project that I am Presently working on. Nichrome Wire is the Heating Element Wire that is Commonly used in MOST Heating Elements. (such as Irons, Baseboard Heaters, Hot plates, Electric Hot water Tanks, Kitchen Stoves, ETC.) It comes in Various wire Gauges, Wattage ratings and also Different Resistances per foot. In Use, It usually Glows RED HOT.
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Post by Gary Lecomte on Nov 23, 2008 20:25:35 GMT -8
I have Re-Designed this with Mosfet and am now testing it on a Breadboard. Preliminary Schematic also Drawn up, But have two errors on it that I need to correct.
I also relpaced the LM339 with an LM358.
Should have some results soon.
Assuming all is OK, I will do up a PC Board for it.
Gary
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Post by Deleted on Nov 30, 2008 6:20:33 GMT -8
HI Guys Gary and Richard; As a dump load, Im thinking a spare battery or bank of. Any ideas? Will this complicate things to much?
Thanks guys,,,Keith
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Post by Gary Lecomte on Nov 30, 2008 8:16:38 GMT -8
Shouldn't complicate much, Except the possibility of over charging that additional set of batterys.
ANYWAY, I have done some serious damage to my right arm, not sure how, but lots of pain.
one Dr. says its "Tennis Elbow". Not sure i believe that! Going to get a second opinion, i think
Severe Pain extends from "my wrist up to and including my shoulder".
so almost everything is on hold. now typing with left hand, right arm in a sling.
not even sure i can fill the orders i have coming..
But anyway, SEASONS GREETING TO ALL.
Gary
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rmeyn
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Post by rmeyn on Nov 30, 2008 19:27:20 GMT -8
Gary, Don't settle for tennis elbow. Particularly if the pain does not subside after a few days. Could be a pinched nerve from splitting wood. Wish you the best Richard M.
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Post by Gary Lecomte on Nov 30, 2008 20:47:40 GMT -8
Gary, Don't settle for tennis elbow. Particularly if the pain does not subside after a few days. Could be a pinched nerve from splitting wood. Wish you the best Richard M. Who Splits Wood? Not Me. Were on Natural Gas heat. But Considering the Location of the pain: The "Whole Arm and Shoulder", I also think its a Pinched nerve. (Tennis Elbow usualy only affect near the Elbow.)
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rmeyn
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Post by rmeyn on Nov 30, 2008 21:38:37 GMT -8
Just thought you might split wood for heating. After all, you sit in icy cold streams in the middle of the winter. Thought there might be a connection Richard M.
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Post by Deleted on Dec 1, 2008 8:15:48 GMT -8
Gary; Sorry to hear about your arm-shoulder.. I used to lift weights as a young lad and learned a lot about pulls etc. ..you certainly have tweaked something if you are in that much pain. An unusual pull or push on a normally not used muscle will give what you have. The back muscles are tied into your shoulders etc, right around to your chest. A mid back lift- twist could give your symptoms..Keep it in the sling and slowly stretch it out over 1-2 weeks...Good luck... As for the post re battery bank 2, It could happen so in the long run you would want a heater or fan to kick in as another -third option . Question, is there a way to control the charge rate itself..I hear that once batteries get close to their full charge they will want less amps or is that not a problem with lead acid? Thanks Keith
w
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