Joule Thief

[innovation_station]

Thank you all for your help (innovation_station, guruji, giantkiller)!

It will take me some days to digest and to implement the inspiration received and I will report back with my results.

A few weeks ago a first round of advice in this forum taught me how to build basic Joule Thieves up to 400 Volt and today I got jumpstarted beyond that.

May the Kilovolts jolt my slow brains to a higher level of thinking! : )

Greetings, Conrad

love the 1 liner ! just awesome ! great luck  and hope to see your effords !

william

[freepow]

Hello, can anyone give me some advice please!

I have a 1.5" toroid with secondary of 120-140t, gives about 400-600v only, with 1xAA. I only am able to put around 150t on the secondary with (bif 2,10t).
If I used even finer wire and wound double the amount of turns, would that give me much more volts??
Question...Should I be able to get around 1000v with 1xAA on a 1.5" toroid?? and if so, could someone suggest how many turns to try, or if I should try a very fine wire and have 300-400t for the secondary etc.
thanks.

[Pirate88179]

freepow:

There are still more variables to account for in your circuit.  What transistor are you using?  What value is your base resistor?  Plus, the wire gauges do make a difference as well.

But, having said this, your output is really pretty good when you think about it.  That also brings up another question, how are you measuring the output?  DMM's have real problems with this measurements because of the high freqs. involved.  In other words, you may very well have more output than you think.

Bill

[stprue]

It's been a while since I posted any pics so this is one of the projects I have been working on.  Sorry you cant see the 5 leds blinking...the camera cannot pick it up!  T

The red wire has a washer that is picking up 60hz out of the lamp that is not turned on and the yellow is going to ground on my power supply that is not turned on.

I have tried the wall that works good too.

[resonanceman]

freepow:

There are still more variables to account for in your circuit.  What transistor are you using?  What value is your base resistor?  Plus, the wire gauges do make a difference as well.

But, having said this, your output is really pretty good when you think about it.  That also brings up another question, how are you measuring the output?  DMM's have real problems with this measurements because of the high freqs. involved.  In other words, you may very well have more output than you think.

Bill

From  what I have been reading   a major variable  is the circuit capacitance ...... lower  capacitance makes a faster circuit.


If you  have  good impulses ....... I would say you do have more power than you think.
The impulses  may have  very high voltage that will not show up on  a DMM  and maybe not even on  a scope.

Even  using  a bridge and measuring the DC is not  accurate
I have measured 6 volts  across a bridge.......but I  was still able  to charge a 12 V battery  with that setup.

We still have no good  way to measure the power  of the
impulses.... the only  practical  way to be sure  if you can power something is to try it.

gary