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Author Topic: Mosfet Capacitor Dump Experiments  (Read 6833 times)

SkyWatcher123

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Mosfet Capacitor Dump Experiments
« on: February 09, 2023, 12:03:00 AM »
Hi all, been working on some oscillators and was thinking about trying the capacitor dump method again and a member on the forum inspired me to experiment some more.
Testing different capacity capacitors, to see which gives the best charging and least input and keeping a watch for any extra charging effects.
Also think the partnered output coil tech. could be useful here, as the more the output is loaded with that tech., the input power decreases, that would be something to test later on.
At the moment, i am using a pancake coil, speaker wire joule/meissner type oscillator, to charge the dump capacitor and a 555 timer and mosfet to dump the capacitor.
So far, the best charging, seems to happening with larger value capacitors, though it is said, that a low uF cap can work well, if the right kind of sharp capacitor dump and frequency is created.
Tried 5600uF-70volt low esr capacitor and now testing a 1.5 farad car audio cap i had laying around.
The car audio capacitor is charging the heck out of the 12volt 5ah sla battery at around 3hz pulse dump frequency.
Will continue to share further experiments.
All comments welcome.
peace love light  :)


erfandl

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Re: Mosfet Capacitor Dump Experiments
« Reply #1 on: February 09, 2023, 07:45:12 AM »
Hi Skywatcher, nice to see you working on this project.
A few years ago I designed a cap dump circuit with a microcontroller (AVR) and got decent results. Using the Joule Thief circuit, I charged a 470 microfarad 35V capacitor, then the microcontroller as a capacitor dump gate activated the MOSFET base when the 35V capacitor was charged and discharged the energy stored in the capacitor into a battery. Now I want to redesign the same circuit without using a microcontroller. I think that using the thyristor, which was already mentioned by the user joellagace, will give better results. I waiting for your test result.
Good luck.  :)

joellagace

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Re: Mosfet Capacitor Dump Experiments
« Reply #2 on: February 09, 2023, 11:40:27 AM »
The problem with using a SCR if you want to call it a problem  is this cap dump is somewhat limited in speed, you can hear the clicks it makes of a few per second in my videos. If your high voltage backEMF source gets "too" hot the SCR simply does not go back into an "off" mode and you get no on off dumps.

On the bright side, SCR seems to offer the best to save power, my back emf generator with cap dump takes around 60ma of current to operate in this mode.

Always looking for new methods, I'm kind of broke right now. I got to wait about a month before I make a new order, Somethings to order are some higher voltage SDRs and loads of them this time! And more of those little square wave generators, they seem to only need milliwatts to operate. And some MOSFETS to experiment with new switching circuits. NEONS and ZENER diodes of various values.

Looking forward to those spring experiments!

take care.

ramset

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Re: Mosfet Capacitor Dump Experiments
« Reply #3 on: February 09, 2023, 04:29:22 PM »
Joel
Do you have a PayPal you can link to ?
Or some way to get funds ?( would Amazon gift card work ?)


Not good to have such a dedicated open source builder sidelined
Do to need for parts
Respectfully
Chet K

joellagace

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Re: Mosfet Capacitor Dump Experiments
« Reply #4 on: February 09, 2023, 05:15:10 PM »
With inflation no one has any money these days its not just me. I got a bunch of stuff for sale like ham transmitters and such on ebay right now and nothing these days is making fast sales, People here in north America are making the decision if they can have eggs for breakfast or not. And that is regular people. It is the worst time to ask for money. I did have setup some pages like gofundme in the past. Nothing of that really worked and I don't like asking people for money.

But yeah the paypal thing is an idea, I tried it in the past as well. Like on my facebook and twitter and such.

floodrod

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Re: Mosfet Capacitor Dump Experiments
« Reply #5 on: February 09, 2023, 05:41:17 PM »
I can throw you a few bucks Joel. I also appreciate your work.  Just make sure to post us schematics of your builds.
  ;)   Message me your info

floodrod

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Re: Mosfet Capacitor Dump Experiments
« Reply #6 on: February 09, 2023, 05:41:39 PM »
Duplicate post....

ramset

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Re: Mosfet Capacitor Dump Experiments
« Reply #7 on: February 09, 2023, 05:50:58 PM »
Cadman had mentioned the Amazon gift cards work for PayPal?
Or I have just sent numbers off back of card to builders if they use Amazon for purchase ?


It’s a problem we need to sort here in open source community!
It is a gift which gives both ways … persons who don’t have your equipment or ability
To experiment..Can help support  those who do !


And also feel included in efforts to help make world a better place !


Respectfully
Chet
Ps
This should be available to all open source experimenters , even lending equipment
For a time ?
Or donating to builders who have history of sharing open source!


Tremendous potential here !
Sorry skywatcher for interrupting
( perhaps you have experimental needs too ?)

joellagace

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Re: Mosfet Capacitor Dump Experiments
« Reply #8 on: February 09, 2023, 05:56:09 PM »
I don't like asking for flat out money. Never have, It's just the nature of the topic you know. Just go on youtube and search for something like "free energy" and the first 100 pages will be scam videos with remarkably 200k viewers,  It's all for monetization clicks and views,  You know my favorite scam video that keeps getting shared all the time with a circle of 9 volt batteries and the light not "connected" to anything in the middle of the circle just lights up like magic LMAO. But the point is its those videos that make it front page and social networks like youtube are not doing anything for the legitimate of these claims. Because they make so much money off the monetization of these 200k viewed video scams. But during the COVID days the blocked any DR with valid PHD for even speaking an "apposing" view. Interesting... Anyhow. The nature of asking for money for such research yells "Scam" all over in red and I just don't want to associate with that or disappoint someone if I get a schematic wrong or something.

What I have asked in the past from my fellow ham friends in person at the clubs and such is to give me all their junk parts. Old tv parts, microwaves, that stash of random semiconductors your never going to use again, That spool of wire collecting dust in the corner or your garage. I got much more luck finding what I need this way then flat out asking for money.

Thanks for the offers But that's just not the vibe im going for here in these forums and my presence on youtube, But if you got spare/junk parts to send me. Now I may want to work with that! :)


joellagace

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Re: Mosfet Capacitor Dump Experiments
« Reply #9 on: February 10, 2023, 01:37:55 AM »
Well since I burned out all my SCRs for now here is how I'm experimenting  with the cap dump method still, while I wait to be able to make an order of new parts including some mosfets.

I'm using the Android tablet and a NPN transistor connected to sound output.  As as switching for the the cap dump. Hey got to use what ever is at hand right!

https://youtu.be/9Yj2XjLpsrc

dujie

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Re: Mosfet Capacitor Dump Experiments
« Reply #10 on: February 10, 2023, 04:09:27 AM »
Do you have a PayPal you can link to ?
Or some way to get funds ?( would Amazon gift card work ?)
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erfandl

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Re: Mosfet Capacitor Dump Experiments
« Reply #11 on: February 10, 2023, 06:51:36 AM »
Well since I burned out all my SCRs for now here is how I'm experimenting  with the cap dump method still, while I wait to be able to make an order of new parts including some mosfets.

I'm using the Android tablet and a NPN transistor connected to sound output.  As as switching for the the cap dump. Hey got to use what ever is at hand right!

https://youtu.be/9Yj2XjLpsrc
thanks for sharing. just a question, is it possible to make an SCR from pairs of PNP and NPN power transistor ?

SkyWatcher123

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Re: Mosfet Capacitor Dump Experiments
« Reply #12 on: February 10, 2023, 10:54:06 PM »

Hi all, Hi joellagace, thanks for being here and sharing your thoughts about these experiments.

Hi erfandl, good to see you're still experimenting.
Yes, i always share everything i observe with my tests.
At the moment, the large 1.5 farad car audio capacitor is too large for the output of this particular oscillator, the voltage seems to only get to around 1 volt over the load battery, before it dumps, though does still charge decent.
So far though, the 71volt-5600uF electrolytic, low esr capacitor, is packing the most punch.
It climbs to around 15.5 volts or around 2.5 volts over charge battery voltage, before cap dumping and the oscillator charging the capacitor, is using around 2.5 watts input.
Hi ramset, all benevolent comments are welcome, it's fine and i feel these experiments
 have great potential also, as i have read of others similar experiments that claimed success.


At the moment, i am using a STW20NM60 Mosfet, 600volt rating, 80 amps pulsed rating, 11ns fall time.
So this mosfet, is able to dump the capacitor charge very quickly and it's a salavaged part,
 don't remember what i salvaged it from though.
Not sure this 12volt-5ah sealed lead acid is the best battery for testing.
I have heard that better results are obtained from liquid form electrolyte,
 instead of the absorbent material used in SLA batteries.
Still testing to see which size capacitor is the most effective or which will
 manifest observable extra charging effects.
It may be, that a lower size capacitor, along with higher voltage, may be needed to manifest
 the novel charging effects.
Since that also allows the capacitor to dump its charge, even faster.
There may be a threshold, where once the capacitor dump is below a certain duty cycle on time
 and of a sufficient abruptness of discharge, we may start to see novel charging effects.
Will continue to experiment.
peace love light

SkyWatcher123

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Re: Mosfet Capacitor Dump Experiments
« Reply #13 on: February 17, 2023, 11:49:45 PM »
Hi all, I have been trying many different things and keeping notes of all the tests.
At the moment, i am testing two 1 farad-20 volt max., car audio capacitors in series for the capacitor dump.
That is around 500,000 uF - 40 volt capacitor.
And although the voltage rise on the capacitor, above that of the charge battery voltage is only around 200-400 millivolts (difficult to see a good reading on meter), it really packs a punch.
When the capacitor dumps, the voltage jumps up 200-300 millivolts on the 12 volt charge battery.
Another good thing, these car audio capacitors are low esr and can push that small voltage differential into a decent amperage pulse.
Will continue the experiments.
All comments welcome.
peace love light :)

joellagace

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Re: Mosfet Capacitor Dump Experiments
« Reply #14 on: February 18, 2023, 12:12:04 AM »
Thanks, This gives me good ideas on what I might want to try next, Still waiting on some ebay sales in order to get more money to buy those mosfets. And other parts  ;D