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Offline o.magTopic starter
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« on: February 16, 2009, 01:33:45 pm »
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Hello,
 i want to make a big coil (1mx1m) for my dbp2010.
type of wire ?
nb of turn ?...

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Offline Eugene52
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« Reply #1 on: February 16, 2009, 09:44:53 pm »
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Hello "o.mag" ! 230 mm diameter is 43 turns of 0.5 mm enamel wire . 450mm diameter is 23 turns of 0.5 mm enamel wire . 1 meter square is approximately 11 turns of 0.5 mm enamel wire . Watch transistor T-7 [2n3773] that it does not get hot , when winding a smaller resistance coil . If it gets warm use a TO-3 Heat-sink . The bigger the Pulse Induction coil size , the less the number turns of wire = equals less DC resistance and higher current  !!!

Regards.................Eugene52

the 450 , 230 and 1 meter size should each have at least 2.0 ohm dc resistance [or a little higher is ok] but not lower !!

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« Last Edit: February 17, 2009, 12:23:54 am by Eugene52 »
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Offline o.magTopic starter
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« Reply #2 on: February 17, 2009, 01:50:09 am »
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Eugene52 hello, thank you for the information. I did not think to check the temperature of T-7 because it is in the box, and if it heats up I would not have room for the radiator. To overheating I think it is because it saturates the coil (pulse duration too long, or value of the coil henry too weak) and not a continuous resistance?


Regards ........Olivier

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« Reply #3 on: February 17, 2009, 08:54:08 am »
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o mag  . The big  ( 1 meter square ) coil is made buy  :   buying  5 meters of  8 strand cable . Each strand is insulated . The color code is  a white , grey Rose , blue  strand etc etc .  Now you clean about 3 inch of each cable -strand .  You make a frame  ( 1 meter x 1 meter ) to fasten this cable to .  You solder one end of a strand to the beginning of another strand . You keep on going around from color to color  ( so you form a coil )  all the insulating wire that is around every strand you connect together and use it as your last wire  .  Now you got your coil .  Cornelius    ( ps   insulate with crimp sockets every soldering connection you made  )

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Offline Eugene52
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« Reply #4 on: February 17, 2009, 10:31:01 am »
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Quote:Posted by Cornelius
o mag  . The big  ( 1 meter square ) coil is made buy  :   buying  5 meters of  8 strand cable . Each strand is insulated . The color code is  a white , grey Rose , blue  strand etc etc .  Now you clean about 3 inch of each cable -strand .  You make a frame  ( 1 meter x 1 meter ) to fasten this cable to .  You solder one end of a strand to the beginning of another strand . You keep on going around from color to color  ( so you form a coil )  all the insulating wire that is around every strand you connect together and use it as your last wire  .  Now you got your coil .  Cornelius    ( ps   insulate with crimp sockets every soldering connection you made  )


Hello , I understand what you did , each solder connection has a very small resistance , multiply that times [8] strands/connections  gives you 2.0 to 2.5 ohms . Or you can use a wire gauge that has slightly more resistance per foot . Very clever Idea Cornelius !!

IF IT WORKS DONT FIX IT................ Great......................Eugene

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« Reply #5 on: February 17, 2009, 10:55:03 am »
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cornelius hello,
 this way of making the big coil is the book. I had made but it never work properly on my sensor (making it impossible to be silent), which is why I seek other alternative.
For smaller coils I already have several alternatives, which work well.

Regards ...olivier

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« Reply #6 on: February 28, 2009, 03:43:56 am »
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hi,
seems i am missing something here (links in forum doesn't seems to work in my browser), could somebody mail me schematics of DBP 2010 (or link) pls.

thanks,
d.


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