### Author Topic: The VIC with resonant cavity project by Steve..  (Read 89483 times)

0 Members and 2 Guests are viewing this topic.

#### Login to see usernames

• Member
• Posts: 280
##### Re: The VIC with resonant cavity project by Steve..
« Reply #304 on: September 25, 2016, 01:48:51 am »
I saw that video too Steve.

What I do is to use if laser printable transparency and cut into stripes, interleving the layers. It helps on capacitance too and prevents layer to layer arc.

#### Login to see usernames

• Administrator
• Hero member
• Posts: 4530
##### Re: The VIC with resonant cavity project by Steve..
« Reply #305 on: September 26, 2016, 21:15:57 pm »
that sounds also good

#### Login to see usernames

• Administrator
• Hero member
• Posts: 4530
##### impedance matching
« Reply #306 on: October 08, 2016, 19:58:10 pm »
Who knows about impedance matching?
The how and why?

#### Login to see usernames

• Member
• Posts: 280
##### Re: The VIC with resonant cavity project by Steve..
« Reply #307 on: October 09, 2016, 13:19:57 pm »
Hello Steve.

The transformer relationship of impedance ratio to turns ratio is:

Npri/Nsec = √Zpri/Zsec

First you need to know your impedance of the  circuit on secondary, and I THINK that you need to calculate it in the lowest value that it can achieve. obvious that frequency will change the overall impedance.

Get the resistive value of the coils, and use the 78.54 or 80 as the cell resistance, sum all and you have the circuit resistance.
Some people said that at resonance the circuit is pure resistive(Russ and Ronnie Walker).

Since you get the impedance of the secondary network, wind your transformer according to it.

BE AWARE: Transformers are not simply turn ratio!
Forget about Meyer primary resistance, it doesnt mean anything, only if you have the same core and the same wire, otherwise forget it.

#### Login to see usernames

• Member
• Posts: 280
##### Re: The VIC with resonant cavity project by Steve..
« Reply #308 on: October 09, 2016, 13:29:51 pm »
What you need is in this site:

http://www.maxmcarter.com/classecalcs/tratiocalc.html

You can input the both impedances and/ or the turns of primary and it returns the results.

Transformer calculation:
http://electronicdesign.com/power/build-your-own-transformer

P.S. if you dont know the B max value use 1500, it is safer for the most ferrite cores.
I will try to find another site that has a simple and clean explanation but at thr time I cannot find it again.

#### Login to see usernames

• Global Moderator
• Hero member
• Posts: 3630
##### Re: impedance matching
« Reply #309 on: October 10, 2016, 09:02:59 am »
Who knows about impedance matching?
The how and why?

impedance matching mean to have a q factor of 1 in a resonant system... this mean that the energy you put in is is totaly lost every cycle.. it means no reflection possible...

in 1/4 wave trasformer the impedance of the load is inverted meaning that a short looks like a open circuit for the input circuit.. and a capacitor load is more than a short circuit.. ir reflects the wave with same polarity..

when we send a single wave thru a line it has a positive and negative going, only a diode can impeed the cell from receiving a negative wave after the positive for ex..

at resonance the circuit is a view as a resistance as power is being dissipated on the coils and capacitors and z is reduced to this losses  if the Q is high energy will be acumulated VAR reactive energy instead but this will happen only at a precise frequency..

A low Q factor imply a possibility to allow the sistem to provide full power to the load at whatever frequency

#### Login to see usernames

• Sr. member
• Posts: 326
• Build it. Power it. Use it.
##### Re: The VIC with resonant cavity project by Steve..
« Reply #310 on: October 11, 2016, 14:51:57 pm »
There's more than one type of impedance matching component.  The audio output transformer in an amplifier uses the resistance of the primary and secondary windings to couple the impedance of the amp to that of the speaker's voice coil.  With a TV, the 75 ohms from the coax is converted to 300 ohms, to feed the tuner.  I opened one of those little boxes up and all it has is a tiny torroid with one and a half turns of very small wire, as well as a very little capacitor.  This looks a lot like the resonant choke shown in Meyer's diagrams.  Is it possible that this is actually an impedance matching circuit, which also needs to be included  along with the actual bifilar chokes?

#### Login to see usernames

• Hero member
• Posts: 610
##### Re: The VIC with resonant cavity project by Steve..
« Reply #311 on: October 12, 2016, 03:00:20 am »
This part is really the only thing Steve Meyers shared in his patent....other than examples of real waveforms.