Joule Thief

[sm0ky2]

do you know the cut-on voltage of the 2222?

i dont have any, but i need to find something that will turn on with my EB. (which is why i was thinking about the 3054/3055)
i know they can handle a lot more pass-through voltage, but its the turn-on v that im concerned about here.
as my EB just doesnt quite make it for the 4401

i have no way of measuring frequency, but i know for a fact my toriods can handle up to the Mhz range, as that's what they are designed to do. (and in fact were doing, before i stole their windings off and wound my own)

also i hooked in a normal AA and a button-cell  (1.5v) into a JT with a 1K Ohm resistor and it works fine with either,
so that means my rechargables that only go up to 1.3v need less resistance.

it was NOT the LEDs like i had thought. even though the reds measure less resstance across the terminals than the white and green, this doesnt seem to affect the turn-on of the transistor or the operation of the JT at all.....

caps - i have lots of caps of every imaginable type, in many different sizes.
though i couldnt for the life of me identify any of them....

i know the gels are 'electrolytic', but thats about it..

i dont know much about the others, most likely some of the ones i have are what you are calling 'supercaps', but which ones, i have not a clue...


just out of curiosity, where are we placing the capacitor in this circuit?

[xee2]

while the trim-pot was a GREAT idea,...

it gives me much frustration.

the 4401 transistor cuts on at 0.71v
3604 chimes in right around 0.74v
my EB gives me 0.66v with no resistor

Did you see my atom smasher idea post for how to get 1.2 volt supply from 0.6 volt EB?

[innovation_station]

this is the exact same as my charger board just 9 on 1 ring 

ist!

[electricme]

@all
I'm back home again, on P840, and slow reading lol.

OK this last weekend, I bought myself a heep of transistors and a Digital Caliper vernier gauge.
I needed something to measure the winding wire sizes, it's been a bit of a gusimation on wire sizes here, so I had to fix it up.

I wanted 25 transistors, 2N3055, to take advantage of buying in quantity, no luck this time, mabye next time, but I now have enough to make a "different" device.

My EB LED is still very dim, I'm going to add a bit more copper wire to it this week sometime and raise the aerial wire component higher.

jim
 

[Pirate88179]

@ All:

Just for the record...I have never had to charge my supercaps overnight.  as a matter of fact, in the early days with the 5.5 volt .47 F cap it charged for about 3 seconds before lighting my led. Later on, with the video I have posted most recently, the 2.3 volt 10F supercap took about 10 seconds to start lighting those leds from the EER.

Where the confusion may have come from, probably my fault, is that somewhere a while back I stated that it would not bother me to have to charge the large 650 F cap all day to be able to run a lot of light at night for the hours I need it....kind of like solar.

My limited knowledge of caps, specifically supercaps, is that they take a little longer to charge up but then only deliver what is demanded from them at that time, like a battery does.  Now, you electronics guys with the "regular" caps know that they will charge up in micro seconds or something.  The supercaps do not do that.  But, they still charge pretty fast and, a regular cap will "dump" every thing it has all at once, these do not do that.

I accidentally discovered this by using a supercap in my first EER circuit almost 2 years ago. (I had no idea it was a supercap until someone on youtube pointed out to me that a cap of .47 F is not possible.  Well, it is.  They said I must mean micro farads.

Well, I can post it again but Coleman has a cordless drill with supercaps only that will run for 2 hours, and totally recharge in 5 minutes. (You can google this) The other drills using standard rechargeable bats will run for 4 hours, but take 6 hours to recharge.

I take no credit for discovering how supercaps work so well with the EER as it was a total accident.  But, if folks look at my videos, you can see the progression from .47 F, to 10F and then two 10 F caps, to my new 650F cap.

I hope this helps.

Bill