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## Solid States Devices => Resonance Circuits and Systems => Topic started by: Thaelin on January 27, 2021, 03:40:31 PM

Title: Selecting the right L/C ratio for tank coils
Post by: Thaelin on January 27, 2021, 03:40:31 PM
Since many different values of L/C can be used for the same frequency, how do you select the best pair for a given frequency?  I am working in the 20 to 80 khz area.

thay

Title: Re: Selecting the right L/C ratio for tank coils
Post by: NdaClouDzzz on April 06, 2021, 12:39:19 AM
I would think something along these lines:
https://youtu.be/r0Fq2BCtlOM (https://youtu.be/r0Fq2BCtlOM)

Armagdn03: "Two methods. One is to place the oscilloscope probe hear the coil and note when you have maximum peak to peak voltage. Two, place some sort of visual indicator in line with the resonant circuit....In this case a incandescent lamp. When the lamp is brightest you have minimum impedance within the circuit indicating resonant frequency"  http://www.energeticforum.com/forum/energetic-forum-discussion/renewable-energy/14511-energy-propagation?p=436362#post436362 (http://www.energeticforum.com/forum/energetic-forum-discussion/renewable-energy/14511-energy-propagation?p=436362#post436362)

https://youtu.be/x-1EKjOtrPM (https://youtu.be/x-1EKjOtrPM)

https://youtu.be/R2y9w9cbwcg (https://youtu.be/R2y9w9cbwcg)
Title: Re: Selecting the right L/C ratio for tank coils
Post by: Magluvin on April 06, 2021, 01:09:16 AM
Since many different values of L/C can be used for the same frequency, how do you select the best pair for a given frequency?  I am working in the 20 to 80 khz area.

thay
Well according to Tesla, you would want your resonant freq to be low. From what I understand, 50khz and up will radiate magnetic energy that you cant get back into the system. Loss.  So large inductance and small capacitance would be a criteria to follow.
Mags
Title: Re: Selecting the right L/C ratio for tank coils
Post by: MasterPlaster on April 06, 2021, 11:22:13 AM
Since many different values of L/C can be used for the same frequency, how do you select the best pair for a given frequency?  I am working in the 20 to 80 khz area.

thay
It is not as precise as you think. Just tip over the box of capacitors and grab one then,  find an inductor that satisfies the equation.
As an alternative, my ex-wife used to select the capacitor by colour!

Title: Re: Selecting the right L/C ratio for tank coils
Post by: AlienGrey on April 06, 2021, 01:07:00 PM
It all sounds like you have all need treated or taught via the mushroom method (kept in the dark and fed bull shit)

But doing it all on a hit and miss basis like your saying your going to have poor Q factor, err so what’s Q ? don’t you think you had better find out ?

SIL
Title: Re: Selecting the right L/C ratio for tank coils
Post by: AlienGrey on April 06, 2021, 01:25:03 PM
Well according to Tesla, you would want your resonant freq to be low. From what I understand, 50khz and up will radiate magnetic energy that you cant get back into the system. Loss.  So large inductance and small capacitance would be a criteria to follow.
Mags
Morey used 31.5 khz do you see a pattern here why he used this frequency ?
Title: Re: Selecting the right L/C ratio for tank coils
Post by: sollaris1989 on April 07, 2021, 12:06:56 AM
Since many different values of L/C can be used for the same frequency, how do you select the best pair for a given frequency?  I am working in the 20 to 80 khz area.

thay

Hello buddy.
Lots of L/C can resonate at 80 khz.
You can have a 30 turn inductor that resonates at that frequency..or you can have a 200 turn inductor.
More turn = more voltage peak.

What do you need? ...You question was kind of short....What do you want to do ?
Thank you.
PS:....At resonance the square wave is transformed into PURE SINE...PERFECT SINE wave....so it is not only about the peak voltage.
Title: Re: Selecting the right L/C ratio for tank coils
Post by: NdaClouDzzz on April 07, 2021, 12:13:48 AM
At resonance the square wave is transformed into PURE SINE...PERFECT SINE wave....so it is not only about the peak voltage.

Easy/cheap way to make a pure-sine inverter?
Title: Re: Selecting the right L/C ratio for tank coils
Post by: Thaelin on April 07, 2021, 01:02:55 AM
Thanks to all here for their answers. An old ham radio guy gave me the answer I needed.  Pick the frequency you want, pick the best coil value that gives you the best Q value and then select the cap  to add.

thay
Title: Re: Selecting the right L/C ratio for tank coils
Post by: MasterPlaster on April 07, 2021, 01:24:40 PM

Title: Re: Selecting the right L/C ratio for tank coils
Post by: lancaIV on April 07, 2021, 01:30:35 PM
Easy/cheap way to make a pure-sine inverter?

a good description for a cheap and high efficient and save transformerless DC/AC inverter :

https://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=2014078802A1&KC=A1&FT=D&ND=3&date=20140320&DB=EPODOC&locale=en_EP
Title: Re: Selecting the right L/C ratio for tank coils
Post by: Thaelin on April 07, 2021, 02:06:08 PM

Have it right in front of me.

thx
Title: Re: Selecting the right L/C ratio for tank coils
Post by: NdaClouDzzz on April 07, 2021, 07:21:24 PM

a good description for a cheap and high efficient and save transformerless DC/AC inverter :

https://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=2014078802A1&KC=A1&FT=D&ND=3&date=20140320&DB=EPODOC&locale=en_EP

👍

https://youtu.be/ssL5scfIFZ8 (https://youtu.be/ssL5scfIFZ8)
Title: Re: Selecting the right L/C ratio for tank coils
Post by: Magluvin on April 10, 2021, 05:35:23 AM

Mags
Title: Re: Selecting the right L/C ratio for tank coils
Post by: Magluvin on April 10, 2021, 07:16:11 AM
Counsel
Mr. Tesla, at that point, what did you mean by electro-magnetic momentum?

Tesla
I mean that you have to have in the circuit, inertia. You have to have a large self-inductance in order that you may accomplish two things: First, a
comparatively low frequency, which will reduce the radiation of the electromagnetic waves to a comparatively small value, and second, a great
resonant effect. That is not possible in an antenna, for instance, of large capacity and small self-inductance. A large capacity and small
self-inductance is the poorest kind of circuit which can be constructed; it gives a very small resonant effect. That was the reason why in my
experiments in Colorado the energies were 1,000 times greater than in the present antennae.

Tesla
I mean this: If you pass a current into a circuit with large self-induction, and no radiation takes place, and you have a low resistance, there is no
possibility of this energy getting out into space; therefore, the impressed impulses accumulate.

Mags
Title: Re: Selecting the right L/C ratio for tank coils
Post by: NdaClouDzzz on April 10, 2021, 11:50:02 PM
Counsel
Mr. Tesla, at that point, what did you mean by electro-magnetic momentum?

Tesla
I mean that you have to have in the circuit, inertia. You have to have a large self-inductance in order that you may accomplish two things: First, a
comparatively low frequency, which will reduce the radiation of the electromagnetic waves to a comparatively small value, and second, a great
resonant effect. That is not possible in an antenna, for instance, of large capacity and small self-inductance. A large capacity and small
self-inductance is the poorest kind of circuit which can be constructed; it gives a very small resonant effect. That was the reason why in my
experiments in Colorado the energies were 1,000 times greater than in the present antennae.

Tesla
I mean this: If you pass a current into a circuit with large self-induction, and no radiation takes place, and you have a low resistance, there is no
possibility of this energy getting out into space; therefore, the impressed impulses accumulate.

Mags

Yes. Hence Joseph Newman's Big Eureka.👍