Captret - Capacitor and Electret

[nievesoliveras]

Somebody is using the capacitor recharge with a capacitor bank here:

http://www.youtube.com/watch?v=MDtgghR0oWw&NR=1

[ibpointless2]

does anyone know how long a 9 volt battery will run a 28 mA led load?

[ibpointless2]

So far i've had made the captret do some useful work, i got it to light a LED continuously. Its a really simple LED driver circuit that go against what the textbooks say how to use a capacitor but it works! I've had one version that has been lighting a red LED for a week now non stop running off a "dead" 9 volt battery.

Now heres my problem. I have two version, both are the same in every way except one has a "dead" 9 volt battery and the other has a new out the package battery. The one that has the dead 9 volt battery is the one thats acting funny, instead of the voltage going down overtime like a normal load it goes up. And yes before i begun the test i let the 9 volt sit for a day untouched, but its been running for a week and the voltage seems to go up everyday! Now the new battery goes down, like it should, but its got me wonder if there is a sweet spot it gets to where it won't consume battery power anymore? Oh and one important note is that the LED will get dimmer over time, BUT will not go completely out when you use a RED LED, and i think it hits that sweet spot where it won't go dim anymore and then it won't consume anymore power?

But i don't know? Try the circuit yourself, its really simple to make.

The capacitor use are 1uF @ 50 volts. Just remove the outer plastic case to show the metal case and that is your "o" that you connect the 9 volts negative cable to. See how long your Captret LED driver will run for?

[Kator01]

Hi Steven,

I would suggest you use a 10 000 MykoF Elko instead of the battery. With such an elko you have a definite amount of energy stored up which you can calculate for a given voltage-level.

Second : is this setup ment to run continously or  do you break connections periodically ( alternating) ?

Regards

Kator01

[ibpointless2]

Hi Steven,

I would suggest you use a 10 000 MykoF Elko instead of the battery. With such an elko you have a definite amount of energy stored up which you can calculate for a given voltage-level.

Second : is this setup ment to run continously or  do you break connections periodically ( alternating) ?

Regards



Kator01

I can't find by what you mean by "10 000 MykoF Elko", i did a google search and found nothing?

The connection is setup to run non-stop, direct current, never disconnecting to see how long it will run. The one that is running the dead battery has been running for about a week now and for some odd reason the voltage goes up as if a heavy load was put on it and you take that load off it and the battery bounces back, but the problem is that the battery has never been disconnected and its been doing this for about a week now. The voltage gain is really nothing to jump up and down about, yesterday it was at 8.04 volts and today its was at 8.05. I'm sure i'm not breaking any laws here because the battery started out at 8.22 volts from resting 24 hours and when i connected everything up the battery went down to 7.70 volts and ever since then it has been going up as if the LED is not even a load on it. It does seem though that recharging is not as fast as it use to be but it still happens. Once it gets over 8.22 volts then i'll be excited, but it still is amazing that the LED load is working in reverse.