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Author Topic: Akula  (Read 44684 times)

Offline Romero

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Re: Akula
« Reply #30 on: March 30, 2014, 08:33:12 PM »

Offline Vincent

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Re: Akula
« Reply #31 on: March 30, 2014, 10:52:49 PM »
http://makeagif.com/i/X93gwp

Hi Dave45,

Interesting. Just my opinion :

- Akula's 30W device is FAKE 100%. I did the replication in 3 different ways and don't show nothing special. Also the guy who did modifications to the original circuit was banned from the Russian Forum.

- The version that you are proposing is probably fake too (99%).

Doing simulations and thinking a circuit it's a good idea...better to put in a bench in the real world. Worst when someone gave a circuit without information about it.....hunting ghosts is not a good path to share knowledge.

Again, just my opinion.

Best Regards,

Vincent




Offline Dave45

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Re: Akula
« Reply #32 on: March 31, 2014, 02:27:57 AM »
Hey Vincent
 The theory is not just based on the Akula schematic but also another Russian builder, dont recall the name but have the basic sch.

The theory uses electron flow and not the conventional view,
here's a circuit thats a little more basic
http://makeagif.com/i/mqXzyk
Whats interesting is the direction the bemf takes through the diode, opposite the neg currents path this would indicate the bemf or collapsing magnetic field is pos.

Offline Dave45

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Re: Akula
« Reply #33 on: March 31, 2014, 03:11:17 AM »
If you want to collect the charge in the cap and keep it in the cap this is a better alternative.
http://makeagif.com/i/oud1Sa

Offline Dave45

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Re: Akula
« Reply #34 on: March 31, 2014, 12:45:07 PM »
The biggest waste of energy I see in this simple circuit is the neg pulse running around and hitting the battery, if a cap were placed here it would seem we could collect and recycle that charge.
Just thinking about it.
dave

Edit: chalk that one up to wishful thinking..........didnt work  :D
« Last Edit: March 31, 2014, 07:57:56 PM by Dave45 »

Offline Vincent

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Re: Akula
« Reply #35 on: April 01, 2014, 02:53:15 AM »
If you want to collect the charge in the cap and keep it in the cap this is a better alternative.
http://makeagif.com/i/oud1Sa

Hi Dave45,

Thank you for your simulations. Information is always welcome. After the tests that I did trough the years :

- You will never, never, never reach more than 100% of efficiency recovering  BEMF whit this setup :

http://makeagif.com/i/oud1Sa

- Dumping charge to a electrolytic capacitor have a few limitations. Works, but not for long time. Cheaper capacitors are not made to work under that kind of electrical stress.

- I'm aware about Russian work. I'm developing a 2 prototypes. When the math model, safety's standard and final test will be finish, I will publish the final doc's AS OPEN SOURCE.

Best Regards,

Vincent

Offline Dave45

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Re: Akula
« Reply #36 on: April 11, 2014, 12:04:43 PM »
Check out power amplifier's
http://en.wikipedia.org/wiki/Amplifier
http://www.vk2zay.net/article/181
Running the bemf into another coil

Offline From other Planet

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Re: Akula
« Reply #37 on: April 11, 2014, 02:55:16 PM »
Hey Vincent
 The theory is not just based on the Akula schematic but also another Russian builder, dont recall the name but have the basic sch.

The theory uses electron flow and not the conventional view,
here's a circuit thats a little more basic
http://makeagif.com/i/mqXzyk
Whats interesting is the direction the bemf takes through the diode, opposite the neg currents path this would indicate the bemf or collapsing magnetic field is pos.

This schematic was posted by Delamorto and he said it was the circuit for the selfrunning device with the 2 digital Amperage and Voltage displays and the microprocessor + 3(?) Halogen bulbs. (sorry not have link now) Most people on OU.com considered it a fake, as the connections of the microprocessor didnt make sense and some other things seemed suspicious. I dont know about that, but circuit schematic itself looks interesting.

kind regards and peace,
From other Planet

Offline Vincent

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Re: Akula
« Reply #38 on: April 12, 2014, 01:18:39 AM »
Check out power amplifier's
http://en.wikipedia.org/wiki/Amplifier
http://www.vk2zay.net/article/181
Running the bemf into another coil

@ Dave45,

I was looking the amplifier and it's a class E. Nice and very know configuration on VHF transmitters.
Sorry to disappoint you, but there is not BEMF dumped to the LC network. The 5.8uh and the var.cap 5-65pf are made to match impedance to the next stage. Also if you read the wikipedia explanation there are few keys to understand the configuration :

" This means that the voltage and the current at the transistor are symmetric with respect to time "
" Class E uses a significant amount of second-harmonic voltage "

If you keep doing research you will find that this configuration reach a 96% of efficiency.
And if you want to build one take a look here :

http://www.wa0itp.com/class%20e%20design.html



@ From other planet

The last Delamorto flashlight and 80% Akula"s device are based on Non Linear Inductive method.
There are a few papers written on that field, amazing equations and mixed theory indeed. I'm working on it and I have found promising results. My advice to everyone who wants to start tests :

- Playing with harmonics can be dangerous. Overlapping frequencies is not a game.
- Radio Frequencies is an amazing field, complicated and is not like working with audio (Low fx).
- Stop doing / coping circuits and start to be focus into coils, saturation and cores types.
- Avoid unstable oscillators (like NE555) and protoboarding prototypes. RF is picky !!!
- Stop driving mosfets with transistors.

As usual, this my opinion based on my experience, a contribution to another colleges and researchers.

Best Regards and have fun !!!

Offline Dave45

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Re: Akula
« Reply #39 on: April 13, 2014, 01:09:20 AM »
Check out power amplifier's
http://en.wikipedia.org/wiki/Amplifier
http://www.vk2zay.net/article/181
Running the bemf into another coil

@ Dave45,

I was looking the amplifier and it's a class E. Nice and very know configuration on VHF transmitters.
Sorry to disappoint you, but there is not BEMF dumped to the LC network. The 5.8uh and the var.cap 5-65pf are made to match impedance to the next stage. Also if you read the wikipedia explanation there are few keys to understand the configuration :

" This means that the voltage and the current at the transistor are symmetric with respect to time "
" Class E uses a significant amount of second-harmonic voltage "

If you keep doing research you will find that this configuration reach a 96% of efficiency.
Hey Vincent
 There is bemf coming from the coil is it being absorbed into the styrene cap?
 I appreciate your advice
Thanks
dave

Offline Dave45

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Re: Akula
« Reply #40 on: April 13, 2014, 02:04:29 AM »
Quote
Stop driving mosfets with transistors.
Hey again Vincent what would you recommend.
Thank you
dave

Offline From other Planet

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Re: Akula
« Reply #41 on: April 13, 2014, 02:12:29 PM »
Maybe use integrated MOSFET driver. Many recommend the TC4420.
Im trying MIC4422BM at the moment, but those are getting destroyed by driving signal frequencies of more than 300-400kHZ
Alread had 2 dying that way  ;)

Quote
Stop driving mosfets with transistors.
Hey again Vincent what would you recommend.
Thank you
dave

Offline Vincent

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Re: Akula
« Reply #42 on: April 13, 2014, 02:15:58 PM »

Dave,

Mosfet Drivers

Microchip Technology Inc. // TC426/TC427/TC428
http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=9010&mid=11&lang=en&pageId=79

Fairchild
http://www.fairchildsemi.com/products/power-management/mosfet-and-igbt-gate-drivers/

IOR // IR2101 / 2113

- Always read the datasheet and application notes before implementing a setup.

Have fun,

Vincent

Offline Vincent

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Re: Akula
« Reply #43 on: April 13, 2014, 02:24:25 PM »
Maybe use integrated MOSFET driver. Many recommend the TC4420.
Im trying MIC4422BM at the moment, but those are getting destroyed by driving signal frequencies of more than 300-400kHZ
Alread had 2 dying that way  ;)

Quote
Stop driving mosfets with transistors.
Hey again Vincent what would you recommend.
Thank you
dave

I fried a few drivers too...Also if you uses decouple capacitors, the spikes or RF killed the drivers. So I started to use high electrolytic capacitors + voltage regulators + ferrite beans (gate side) and all was fine.

So if I want to drive a Mosfet with 10 Volt on his GATE, I use a LM7810 + 4700uf to feed the driver. Voltage IN < VCC ( Driver rule).

V

Offline Dave45

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Re: Akula
« Reply #44 on: May 09, 2014, 12:49:18 PM »
The Akula sch. just didnt look right, I made a few mods.
I would really appreciate your advice.
dave


 

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