geometrics g-826

[Carl]

Rick -


I'm pretty sure I have that issue of R-E. My recollection is that the formula is valid for long inductors where length > radius, or something like that. I will try to dig up the article.


If I cannot find any reference material for scramble-wound short coils then maybe the best thing is do it experimentally. For that, I need to finish the coil winder I'm working on.


- Carl

[Carl]

Re: coils still- but not forever

Rick -


I'm pretty sure I have that issue of R-E. My recollection is that the formula is valid for long inductors where length > radius, or something like that. I will try to dig up the article.


If I cannot find any reference material for scramble-wound short coils then maybe the best thing is do it experimentally. For that, I need to finish the coil winder I'm working on.


- Carl

[rick]

Re: coils still- but not forever

hi carl--


the pictorial on the web site shows a long solenoid


type structure---the coils made here are generally


on a plexiglass form with easy measure of dimentions.


by a resistance measure can get close on the number


of turns---by resonance with cap of known value


(though Q is a little wide sometimes) carefull


peaking---can attain inductance value--by experiment.


then by plugging in values into formula mentioned,the


delta was not too far different---so close that just


tweeking the frequency a little from what was called


peaked--now difference is on the other side....


should be interesting to see you come up with---


question--you make coil winder--mine all by hand--


tedious but no production requirements...running out


of magnet wire----not like old days 1lb/4.95


regards rick

[rick]

Re: coils still- but not forever

hi carl--


the pictorial on the web site shows a long solenoid


type structure---the coils made here are generally


on a plexiglass form with easy measure of dimentions.


by a resistance measure can get close on the number


of turns---by resonance with cap of known value


(though Q is a little wide sometimes) carefull


peaking---can attain inductance value--by experiment.


then by plugging in values into formula mentioned,the


delta was not too far different---so close that just


tweeking the frequency a little from what was called


peaked--now difference is on the other side....


should be interesting to see you come up with---


question--you make coil winder--mine all by hand--


tedious but no production requirements...running out


of magnet wire----not like old days 1lb/4.95


regards rick

[JIMI]

Re: coils still- but not forever

Hi folks, thought I would pass on a couple of techniqes I have used and still use to make coils.


#1 I cut a master form out of plywood, 1/2" 5/8" or whatever I want ro use in the diameter I want. Then I make a couple of sides about 1" more in diameter and screw them to the sides. As i wind the coil I use a wood dowl or bolt through a hole in the side as a handle and just let it turn on a small shaft, counting the turns as I go. When done just remove the screws from one side and tape the coil before removeing it.


#2 I am currently experamenting with using PVC as a form buy cutting it in half on a table saw and then gently heating it to make my bends. You come out with a PVC u that you wind the coil on.


Just a couple of thoughts to pass along.


JIMI


>well after a little more investigation,found a formula


>that seems to be close to that desired---how close


>are the results ???? maybe not too far off---recalling


>the inductance of past coils made----so if any are


>interested-----stoped to find again--me get better


>on this 486 fancy box--kind of cute--but the code


>is quite inefficiant anyway


>http:www.uslink.net/~cybercir/cir23.htm--you look


>glad those boys do--


>This shows how to design air core inductors. In the above formula: L= inductance in microhenries,


>a= average diameter of the coil in inches, b= length of the coil in inches, c=radial depth of the


>winding in inches, n= total turns of wire.


>Source: "Radio-Electronics" Magazine, Nov,88 issue (C) Copyright Gernsback Publications, Inc.,


>1988


>L=.2a^2n^2/(3a+9b+10c)


>this does not take gauge into consideration and for a round shape----would not expect inductance to change


>much (orde of magnetude) if shape coil to elliptical


>me shut up and push button now----

[JIMI]

Re: coils still- but not forever

Hi folks, thought I would pass on a couple of techniqes I have used and still use to make coils.


#1 I cut a master form out of plywood, 1/2" 5/8" or whatever I want ro use in the diameter I want. Then I make a couple of sides about 1" more in diameter and screw them to the sides. As i wind the coil I use a wood dowl or bolt through a hole in the side as a handle and just let it turn on a small shaft, counting the turns as I go. When done just remove the screws from one side and tape the coil before removeing it.


#2 I am currently experamenting with using PVC as a form buy cutting it in half on a table saw and then gently heating it to make my bends. You come out with a PVC u that you wind the coil on.


Just a couple of thoughts to pass along.


JIMI


>well after a little more investigation,found a formula


>that seems to be close to that desired---how close


>are the results ???? maybe not too far off---recalling


>the inductance of past coils made----so if any are


>interested-----stoped to find again--me get better


>on this 486 fancy box--kind of cute--but the code


>is quite inefficiant anyway


>http:www.uslink.net/~cybercir/cir23.htm--you look


>glad those boys do--


>This shows how to design air core inductors. In the above formula: L= inductance in microhenries,


>a= average diameter of the coil in inches, b= length of the coil in inches, c=radial depth of the


>winding in inches, n= total turns of wire.


>Source: "Radio-Electronics" Magazine, Nov,88 issue (C) Copyright Gernsback Publications, Inc.,


>1988


>L=.2a^2n^2/(3a+9b+10c)


>this does not take gauge into consideration and for a round shape----would not expect inductance to change


>much (orde of magnetude) if shape coil to elliptical


>me shut up and push button now----

[[email protected]]

geometrics g-826

Hi I have a geometrics g-826 base station mag with portable sensor(for land


use),unit


is old but pristine. Portable unit,when taken from base station,uses d-cells


for power,sensor is about 5 in dia,6in tall. when plugged into base station


input is 24vdc,115vac. I have attached 100 ft cable to portable sensor and


hope to use it for underwater work,but havent yet. Fluids ive used before in


mags usually is unleaded gasoline and coleman white gas,with no problems. Has


anyone have any opinions about the G-826 mag. It has a north arrow for


alignment on sensor for use in high latitudes.

[Bella Grace]

Some links

There are some links for topic starter: acyclovir site about acyclovir. lipitor medication site about lipitor medication. clonazepam withdrawal symptom site about clonazepam withdrawal symptom. soma online pharmacy site about soma online pharmacy. drug lipitor side effects site about drug lipitor side effects. alprazolam best price site about alprazolam best price. tamiflu site about tamiflu. clonazepam overdose site about clonazepam overdose. buy klonopin online site about buy klonopin online. side effects of steroid site about side effects of steroid. propecia before and after photo site about propecia before and after photo. acne treatment dosing site about acne treatment dosing. celebrex cancer site about celebrex cancer. carisoprodol sale site about carisoprodol sale. flonase generic site about flonase generic. zoloft weight loss site about zoloft weight loss. zoloft withdrawal symptom site about zoloft withdrawal symptom. meridia success story site about meridia success story. order cheap prozac site about order cheap prozac. purchase hydrocodone site about purchase hydrocodone. wellbutrin xl site about wellbutrin xl. tramadol hcl site about tramadol hcl. diazepam overdose site about diazepam overdose. prescription soma site about prescription soma. paxil side effects site about paxil side effects. hoodia and pregnancy site about hoodia and pregnancy. carisoprodol 350mg site about carisoprodol 350mg. meridia sibutramine site about meridia sibutramine. alcohol lorazepam site about alcohol lorazepam.

[Kayla Leigh]

Some links

There are some links for topic starter: buy lorazepam web page about buy lorazepam. buy tramadol online web page about buy tramadol online. norco best price web page about norco best price. buy ultram online web page about buy ultram online. ibuprofen ingredient web page about ibuprofen ingredient. meridia side effects web page about meridia side effects. generic vicodin web page about generic vicodin. buy allegra web page about buy allegra. zoloft side effects web page about zoloft side effects. lipitor side effects blister web page about lipitor side effects blister. levaquin 500 web page about levaquin 500. cheap levitra web page about cheap levitra. get propecia web page about get propecia. buy diazepam online web page about buy diazepam online. sustanon addiction web page about sustanon addiction. vicodin side effects web page about vicodin side effects. fioricet generic web page about fioricet generic. buy ultram web page about buy ultram. aciphex medication web page about aciphex medication. levitra web page about levitra. drug norco web page about drug norco. sustanon web page about sustanon. alprazolam online web page about alprazolam online. drug norco web page about drug norco. wellbutrin web page about wellbutrin. carisoprodol best price web page about carisoprodol best price. wellbutrin weight gain web page about wellbutrin weight gain. didrex web page about didrex. paxil side effects web page about paxil side effects.