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All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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Jack,
There are several calcs on the net that will get you that.? My favorite is the one at DIz's site kitsandparts.com.
The toroid calc will give you your answer including length for leads.
Allison
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As Allison says,there are aps which give very precise results, I would suggest the finished torrid I'd checked on a multimeter which measured inductance.
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Jack,
There are several calcs on the net that will get you that.? My favorite is the one at DIz's site kitsandparts.com.
The toroid calc will give you your answer including length for leads.
Allison
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Allison, Ian:
Perfect! Just what I needed...thanks!!
Jack, W8TEE
On Wednesday, November 14, 2018, 3:21:17 PM EST, Ian Reeve <ian.radioworkshop@...> wrote:
As Allison says,there are aps which give very precise results, I would suggest the finished torrid I'd checked on a multimeter which measured inductance.
Jack,
There are several calcs on the net that will get you that.? My favorite is the one at DIz's site kitsandparts.com.
The toroid calc will give you your answer including length for leads.
Allison
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Jack, I don't know about an app, but I use? for that info.
Good luck,
Marco - KG5PRT
On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum= [email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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On Wednesday, November 14, 2018, 4:48:31 PM EST, M Garza <mgarza896@...> wrote:
Jack, I don't know about an app, but I use? for that info.
Good luck,
Marco - KG5PRT
On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum= [email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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I use a software by MicroMetals, at least 20yrs old running on a Pentium 90Mhz... it's the best I ever seen. You might check whether they have something on their website.
Il 14/nov/2018 22:59, "Jack Purdum via Groups.Io" <jjpurdum= [email protected]> ha scritto:
On Wednesday, November 14, 2018, 4:48:31 PM EST, M Garza < mgarza896@...> wrote:
Jack, I don't know about an app, but I use? for that info.
Good luck,
Marco - KG5PRT
On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum= [email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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They do have a very good program, although you must register to use it as it's run online. However, it gives you a lot of info over and above the normal # of turns (e.g., wire size for the stated load, etc.):
My T68-6 shows the proper number of turns (31) and the calculated inductance (4.345?H). It says the core costs $0.19 and they do sell cores, but I have no idea what the min purchase is. Note the number of pages of output!! As far as the wire length goes, Diz's is good enough for my needs.
Jack, W8TEE
On Thursday, November 15, 2018, 2:58:11 AM EST, iz oos <and2oosiz2@...> wrote:
I use a software by MicroMetals, at least 20yrs old running on a Pentium 90Mhz... it's the best I ever seen. You might check whether they have something on their website.
Il 14/nov/2018 22:59, "Jack Purdum via Groups.Io" <jjpurdum= [email protected]> ha scritto:
On Wednesday, November 14, 2018, 4:48:31 PM EST, M Garza < mgarza896@...> wrote:
Jack, I don't know about an app, but I use? for that info.
Good luck,
Marco - KG5PRT
On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum= [email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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Hi Jack, I have found the turns calculations may not work out well unless you have the exact toroid material.? What I thought was a yellow at one point turned out to be some thing else.? I would do a trial winding of ten turns and measure the result.? If it is close, OK.? If not, use the measurement of the ten turns to figure out what is actually needed. ? If your meter does not measure low enough, you can borrow mine. Al ? Sent from for Windows 10 ?
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From: Jack Purdum via Groups.IoSent: Thursday, November 15, 2018 9:23 AM To: [email protected]Subject: Re: [BITX20] Wire length estimate for toroid winding ? They do have a very good program, although you must register to use it as it's run online. However, it gives you a lot of info over and above the normal # of turns (e.g., wire size for the stated load, etc.): | Micrometals Arnold Powder Cores |
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My T68-6 shows the proper number of turns (31) and the calculated inductance (4.345?H). It says the core costs $0.19 and they do sell cores, but I have no idea what the min purchase is. Note the number of pages of output!! As far as the wire length goes, Diz's is good enough for my needs. ? On Thursday, November 15, 2018, 2:58:11 AM EST, iz oos <and2oosiz2@...> wrote: I use a software by MicroMetals, at least 20yrs old running on a Pentium 90Mhz... it's the best I ever seen. You might check whether they have something on their website. ? Il 14/nov/2018 22:59, "Jack Purdum via Groups.Io" <jjpurdum=[email protected]> ha scritto: On Wednesday, November 14, 2018, 4:48:31 PM EST, M Garza <mgarza896@...> wrote: Jack, I don't know about an app, but I use? for that info. ? On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum=[email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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I always do the same thing. ?Make a test wind to be sure of what I¡¯m working with.?
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On Nov 15, 2018, at 8:29 AM, Albert Peter < albertfpeter@...> wrote: Hi Jack, I have found the turns calculations may not work out well unless you have the exact toroid material.? What I thought was a yellow at one point turned out to be some thing else.? I would do a trial winding of ten turns and measure the result.? If it is close, OK.? If not, use the measurement of the ten turns to figure out what is actually needed. ? If your meter does not measure low enough, you can borrow mine. Al ? Sent from for Windows 10 ? ? They do have a very good program, although you must register to use it as it's run online. However, it gives you a lot of info over and above the normal # of turns (e.g., wire size for the stated load, etc.): | Micrometals Arnold Powder Cores |
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My T68-6 shows the proper number of turns (31) and the calculated inductance (4.345?H). It says the core costs $0.19 and they do sell cores, but I have no idea what the min purchase is. Note the number of pages of output!! As far as the wire length goes, Diz's is good enough for my needs. ? On Thursday, November 15, 2018, 2:58:11 AM EST, iz oos <and2oosiz2@...> wrote: I use a software by MicroMetals, at least 20yrs old running on a Pentium 90Mhz... it's the best I ever seen. You might check whether they have something on their website. ? Il 14/nov/2018 22:59, "Jack Purdum via Groups.Io" <jjpurdum=[email protected]> ha scritto: On Wednesday, November 14, 2018, 4:48:31 PM EST, M Garza <mgarza896@...> wrote: Jack, I don't know about an app, but I use? for that info. ? On Wed, Nov 14, 2018, 2:15 PM Jack Purdum via Groups.Io <jjpurdum=[email protected] wrote: All:
I'm in the process of winding some small toroids on a T68-6 core to get about 4.3?H. My winding calculator tells me it will take about 30 turns. My question is: Is there an app where you can enter the core, the number of turns, and it calculates the length of the wire needs for the inductor? I can estimate this by taking a single turn of string, measure it, multiply by 30 and add an inch or two, but I thought maybe somebody's already done this. Just wondering...
Jack, W8TEE
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<D8FDE863FAA64D8CB52ABE5EC7FE85A5.png>
<Toroid.jpg>
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On Wed, Nov 14, 2018 at 02:15 PM, Jack Purdum wrote:
4.3
That's what I get:
https://www.mikeyancey.com/hamcalc/toroidcalculator.php
Inductance
The Desired Inductance (L): 4.3 ?H
Calculated Inductance: 4.23 ?H (98.4% of desired L)
Turns Required: 30
Length of Wire Needed: 24 inches / 61 cm
Toroid Detail
Part Number: T-68-6
Color: Yellow
Frequency Range: 10 to 50 Mhz
Permeability (u): 8
AL: 47 ?H/100 turns
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I wound one and measured the inductance and it was too high with 30 turns. Dropped it to 28 and it's right on the money. The wire length was spot on, with a little for a pigtail.
Jack, W8TEE
On Friday, November 16, 2018, 1:16:17 PM EST, Mike Yancey <mikeyancey@...> wrote:
On Wed, Nov 14, 2018 at 02:15 PM, Jack Purdum wrote:
4.3
That's what I get:
https://www.mikeyancey.com/hamcalc/toroidcalculator.php
Inductance
The Desired Inductance (L): 4.3 ?H
Calculated Inductance: 4.23 ?H (98.4% of desired L)
Turns Required: 30
Length of Wire Needed: 24 inches / 61 cm
Toroid Detail
Part Number: T-68-6
Color: Yellow
Frequency Range: 10 to 50 Mhz
Permeability (u): 8
AL: 47 ?H/100 turns
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Actual inductance depends on how close are the turns and how spread around the toroids (200, 360 degrees etc). I usually cut the wire a bit in excess, wound the theoretical number of turns, measure the actual inductance with a cheap Chinese precision LC meter, and then adjust the distribution of the turns. Of course it is easier to make these adjustments when the toroid is relatively large compared to the number of turns.
Il 16/nov/2018 19:40, "Jack Purdum via Groups.Io" <jjpurdum= [email protected]> ha scritto:
I wound one and measured the inductance and it was too high with 30 turns. Dropped it to 28 and it's right on the money. The wire length was spot on, with a little for a pigtail.
Jack, W8TEE
On Friday, November 16, 2018, 1:16:17 PM EST, Mike Yancey < mikeyancey@...> wrote:
On Wed, Nov 14, 2018 at 02:15 PM, Jack Purdum wrote:
4.3
That's what I get:
Inductance
The Desired Inductance (L): 4.3 ?H
Calculated Inductance: 4.23 ?H (98.4% of desired L)
Turns Required: 30
Length of Wire Needed: 24 inches / 61 cm
Toroid Detail
Part Number: T-68-6
Color: Yellow
Frequency Range: 10 to 50 Mhz
Permeability (u): 8
AL: 47 ?H/100 turns
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