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Author Topic: Captret - Capacitor and Electret  (Read 320320 times)

Kator01

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Re: Captret - Capacitor and Electret
« Reply #45 on: November 07, 2010, 12:52:27 PM »
Hello ibpointless,

See here for electrolytic caps > 10 00 myF :
http://www.lowesr.com/catalog.asp#RADALUM


In addition you must take into consideration that in order to load a capacitor to need to feed in  double the energy of what is stored in the end of the charge-process if you use a normal loading-process

For the facts please read this here, especially the paragraph “The energy losses in the ESR”:
http://www.olino.org/us/articles/2006/11/22/charge-efficiency-capacitor

The energy-losses do not depend on the value of inner resistance but on the method of charging
the capacitor.

Please pay special attention to post #13 ,  last post from member “sig”

There are a set of scientific papers relating this facts but I will spare my time to post it here because I found that many here will continue into believing in their concept despite the disillusioning facts.

Hope this makes the issue a bit more realistic.

Regards

Kator01


ibpointless2

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Re: Captret - Capacitor and Electret
« Reply #46 on: November 07, 2010, 01:58:13 PM »
Hello ibpointless,

See here for electrolytic caps > 10 00 myF :
http://www.lowesr.com/catalog.asp#RADALUM


In addition you must take into consideration that in order to load a capacitor to need to feed in  double the energy of what is stored in the end of the charge-process if you use a normal loading-process

For the facts please read this here, especially the paragraph “The energy losses in the ESR”:
http://www.olino.org/us/articles/2006/11/22/charge-efficiency-capacitor

The energy-losses do not depend on the value of inner resistance but on the method of charging
the capacitor.

Please pay special attention to post #13 ,  last post from member “sig”

There are a set of scientific papers relating this facts but I will spare my time to post it here because I found that many here will continue into believing in their concept despite the disillusioning facts.

Hope this makes the issue a bit more realistic.

Regards

Kator01


I'm not using the normal loading process, i'm doing something not even the textbooks mention. My capacitors are not capacitors anymore they're captrets now. I can't find these scientific papers nor can i find sig's post, could you please post a direct link to it?

Kator01

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Re: Captret - Capacitor and Electret
« Reply #47 on: November 07, 2010, 03:15:58 PM »
Hello ibpointelss2,

the second link I posted, go down the page to the last post. I do not know why these links do not work for you.

I told you that I will not post the scientific papers bescause it is not necessary afte you have read this info, here it is agian:

http://www.olino.org/us/articles/2006/11/22/charge-efficiency-capacitor

Kator01

Kator01

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Re: Captret - Capacitor and Electret
« Reply #48 on: November 07, 2010, 03:35:02 PM »

I'm not using the normal loading process, i'm doing something not even the textbooks mention. My capacitors are not capacitors anymore they're captrets now. I can't find these scientific papers nor can i find sig's post, could you please post a direct link to it?

Whatever method really is used, mainly depends on wheter the casing is galvanicly coupled with the negative terminal.

Please deplete the cap and measure the resistance between casing and the negative terminal. Use the Meg-Ohm-rage of you Mulitmeter in order to watch the loading-prozess done by the battery of your digi-meter.
If the Ohmic value slowly increases and finaly ends up "infinite" then you have to find out next what the value in mykoFarad is between casing and the neg. terminal in order to calculate teh addition energy stored.
LED´s are not suited for power-measurement. They are non-linear elements and foto-sensitive which means that light from the enviroment creates a voltage across the n-p-transition-area, loading your cap back)  Take a 1 Kohm-Resistor or higher as a load and monitor the voltage-drop over the time and above all put the whole setup in a  black cardbox so there is no light entering the inner of the box.
Another test would be to deliberately let a bright cold light shine on the LED that you will understand what I am talking about.

Regards

Kator01

nievesoliveras

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Re: Captret - Capacitor and Electret
« Reply #49 on: November 07, 2010, 03:35:50 PM »
Part of the inside info of the link.

ibpointless2

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Re: Captret - Capacitor and Electret
« Reply #50 on: November 07, 2010, 06:23:12 PM »
So i have two circuits going on. Both are running the same type of red LED and both are using the same type of capacitor turned into a captret. When both batteries are connected to their circuits the battery voltage on both will drop. Now this is where they start to act different. The Charged "new" battery will keep going down over time, not very fast but it will go down. The "dead" battery will go up  ???  Don't know but it does. One would expect that both batteries to drop when connected to the circuit and they do, but one would not expect the dead battery one to go up while still under the LED load. Even when the LED is left in the darkness or switch the LED out with a resistor or a electric motor and the same effect will happen. So makes these dead batteries that much better? will my charged new battery drain enough and become dead to where they will start to charge back up?

Why do the LED's even run? I've have them running on voltage above 20V and they don't burn out like you would expect.

When a capacitor is in series with a battery it will get full and make a open circuit, but the captret never shuts off.

So far all i know is that i got a LED light that will run off a "dead" 9 volt battery and keep running for infinite amount of time.


For even more explanation on the captret vs capacitor here is a video

http://www.youtube.com/watch?v=c6U7Lg95-2s

broli

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Re: Captret - Capacitor and Electret
« Reply #51 on: November 07, 2010, 09:47:15 PM »
So i have two circuits going on. Both are running the same type of red LED and both are using the same type of capacitor turned into a captret. When both batteries are connected to their circuits the battery voltage on both will drop. Now this is where they start to act different. The Charged "new" battery will keep going down over time, not very fast but it will go down. The "dead" battery will go up  ???  Don't know but it does. One would expect that both batteries to drop when connected to the circuit and they do, but one would not expect the dead battery one to go up while still under the LED load. Even when the LED is left in the darkness or switch the LED out with a resistor or a electric motor and the same effect will happen. So makes these dead batteries that much better? will my charged new battery drain enough and become dead to where they will start to charge back up?

Why do the LED's even run? I've have them running on voltage above 20V and they don't burn out like you would expect.

When a capacitor is in series with a battery it will get full and make a open circuit, but the captret never shuts off.

So far all i know is that i got a LED light that will run off a "dead" 9 volt battery and keep running for infinite amount of time.


For even more explanation on the captret vs capacitor here is a video

http://www.youtube.com/watch?v=c6U7Lg95-2s

Can you draw a circuit of this, it's a bit hard to see where the wires are going, thanks.

ibpointless2

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Re: Captret - Capacitor and Electret
« Reply #52 on: November 07, 2010, 10:38:27 PM »
Picture of captret led driver circuit.

broli

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Re: Captret - Capacitor and Electret
« Reply #53 on: November 07, 2010, 11:39:48 PM »
Picture of captret led driver circuit.

Thanks, I managed to replicate it and it's quite interesting. Actually you don't need to use both main legs of the cap, it also works like seen below.

There's obviously no short between the top cap and legs so that's ruled out. However my friend suggested it could be picking up radio waves. I want to rule this out by putting it in a faraday cage tomorrow.

nievesoliveras

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Re: Captret - Capacitor and Electret
« Reply #54 on: November 07, 2010, 11:48:14 PM »
I tried a capacitor with a dead 9v battery and a led. It has not worked yet. I will let it connected a few days and see if the battery gains a charge.

The capacitor is a 2200uf 16v I took from an old motherboard. the battery had 2v when I connected it to the circuit.

Jesus

broli

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Re: Captret - Capacitor and Electret
« Reply #55 on: November 07, 2010, 11:58:38 PM »
@nievesoliveras: ignore that drawing fully the original.

Also polarity matters, and a larger capacitance increases the brightness, went from 47µF to 3300µF.

ibpointless2

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Re: Captret - Capacitor and Electret
« Reply #56 on: November 08, 2010, 12:04:45 AM »
Thanks, I managed to replicate it and it's quite interesting. Actually you don't need to use both main legs of the cap, it also works like seen below.

There's obviously no short between the top cap and legs so that's ruled out. However my friend suggested it could be picking up radio waves. I want to rule this out by putting it in a faraday cage tomorrow.


I knew you could do that, i found out by accident when switching capacitors. I find it doesn't work exactly the same when you do it your way, it like the capacitor is not even there.  ???
hmm you got it working from the top to the -, i usually go from top  to the +.
 :)

I don't think its picking up radio waves.

ibpointless2

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Re: Captret - Capacitor and Electret
« Reply #57 on: November 08, 2010, 12:15:01 AM »
I tried a capacitor with a dead 9v battery and a led. It has not worked yet. I will let it connected a few days and see if the battery gains a charge.

The capacitor is a 2200uf 16v I took from an old motherboard. the battery had 2v when I connected it to the circuit.

Jesus

Your dead 9 volt battery is too low! it needs to be a "fresh" dead 9 volt that has at least 7 volts and up. For best results you should use a series of dead 9 volts that equal around 20 volts. The captret loves voltage. You might also want to try a lower farad capacitor too, i used a 1uf @ 400 volt capacitor for mine.

********************************
I also make note for those who are having trouble replicating the circuit.

Your capacitor must be pre-charged first, and by that i mean the - and the + of the capacitor must be charge from the battery your going to use or a battery with the same voltage before connect everything up. Just a quick tap of the leads of the capacitor to the connection of the battery will do. Basically what you need is a capacitor that has been used before or at least charge up a new capacitor before connecting it all.
********************************


But yeah your voltage is too low. You can use AA's if you want but the voltage of the batteries in series must be higher than 7 volts, 20 volts is preferred.

nievesoliveras

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Re: Captret - Capacitor and Electret
« Reply #58 on: November 08, 2010, 12:20:27 AM »
Thank you for the tips @bpointless2!

broli

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Re: Captret - Capacitor and Electret
« Reply #59 on: November 08, 2010, 12:29:59 AM »

Your capacitor must be pre-charged first, and by that i mean the - and the + of the capacitor must be charge from the battery your going to use or a battery with the same voltage before connect everything up. Just a quick tap of the leads of the capacitor to the connection of the battery will do. Basically what you need is a capacitor that has been used before or at least charge up a new capacitor before connecting it all.


This isn't the case with mine. In fact I just noticed it works equally well if you short the 2 legs together. Btw I'm using a new 23A 12volt battery.