Joule Thief

[xee2]

@ gadgetmall

Using tip21

Transistor is critical. Only transistors so far shown to work are the 2N3055 and TIP31.

[gadgetmall]

@ gadgetmall

Transistor is critical. Only transistors so far shown to work are the 2N3055 and TIP31.

Yes  that was a typo . using and tried tip31 and darlington tip121
Well i tried it 8 ways from Sunday and it wont work . Guess i will get a another toroid out of the batch and try again. I am Cursed. At least i can ligt 4 bright leds from 0.80 ma at .20 volts:)


gadget ..

[hazens1]

One question .. when you wound the 150 did you go backwards after you hit the end ? . i did . when i ran out of space i just continued the same direction over the and in between until i met the beginning ..

Gadget

Yes


Also, the single diode + cap measurement I believe is from Xee2's diagram. What's not in my diagram is the 600v 1a bridge rectifier that I use for measurements. I was using a couple of 200v 22uf electro caps in series to take voltage measurements after the bridge. Now I'm using a 104k 1000v blue Radio Shack ceramic after the bridge to measure the voltage since it charges instantly and has less chance of zapping me if I accidently touch the leads.

My coil starts singing when it is close to maximum voltage and is at it's loudest when I'm at maximum voltage as I'm adjusting the resistor pot. I've had many coils that sing. Not sure the frequency of the singing, but about half the people who have seen it cannot hear the singing so it must be close to the end of the human audible range. When I'm adjusting, I use a 10k ohm fine tune pot then when I get the right setting, I measure the pot then use the closest resistor I have. Going from lower to higher resistance while measureing voltage shows a voltage curve. Always use a pot to fine tune the coil. Each one has it's own preferred fequency and adjusting the resistance changes the freq.

[gadgetmall]

When i put a 104- 105 cap in series with the secondary i get 0 volts dc or ac ?? I have always got that . now if i put the cap in series with the diode then i get about 7 volts . this is the maximum i get even with a darlington . the cap is killing the circuit . it will also work as a normal jt lighting a bright led only at 10 ohms.anything else it stops oscillation . and yes i removed the led before testing.i have really never got over a few volts on any secondary i ever wound . the most was 10 volts and that was an attempt at an mk 2 . I have anew tiny Square Fl from goldmine and i really wanted to light it with the hazen1 setup but looks like i am one who is stuck in Low power mode... Now if i charge an electro cap up i get 80 -90 volts dc but as soon as i try to use it of course it drops instantly ..

MK1 . Are you here ?


Well i'll chat later have to run to the Rshack and finish a project for a customer . The Fugi he is getting has ran for 16 hours with 1 13 watt CFL and he is almost ready for the mail . L8r and thanks . I will wind another one when imy nerves calm down.

Gadgetmall ..

[Mk1]

@all

All i can say is well done everyone !

@electricme

Change the diodes they are limited at around 400 volts, 1n4007 go up to 1000, sorry i still have over 850 volts, and that is 2 times 2 coils. 2 tubes 

@all

Now we need to make some improvement on the output circuit and should really look into finding a way to switch the coil , because loading the coil can affect the frequency set at the base , and change the volts output drastically.

Mark

Gadget nice to see you back !