Joule Thief

[Pirate88179]

Jadaro:

I have not seen that to be the case either.  I have run these JT's from AAA, AA and C and D batteries.  All the same voltage but many more mAhs in the bigger bats of course.  All my JT circuits did was to run a whole heck of a lot longer but other than that, I did not see any improvements with the additional available amperage.  I just had a thought though...available amperage.  Perhaps even though the amps were there, they were not drawn upon by our circuits as we have them.  So, you still may be right because since my JT's did not draw the amps, I can't really say what the effect would be on the field and hence the output if it did.

Bill

[crowclaw]

Jadaro:

I have not seen that to be the case either.  I have run these JT's from AAA, AA and C and D batteries.  All the same voltage but many more mAhs in the bigger bats of course.  All my JT circuits did was to run a whole heck of a lot longer but other than that, I did not see any improvements with the additional available amperage.  I just had a thought though...available amperage.  Perhaps even though the amps were there, they were not drawn upon by our circuits as we have them.  So, you still may be right because since my JT's did not draw the amps, I can't really say what the effect would be on the field and hence the output if it did.

Bill

@ Bill,

The more batteries you add in parallel of the same voltage will increase the available current capacity, how much current is drawn from the cells depends on the demand of the load circuit. Say the circuit draws 50mA adding more cells in parallel will not make any difference to the current demand. As you have already found out, because you have increased the current capacity by adding more cells in parallel your run time lasts much longer due to the extra available current.

@ Jadaro,

Sorry mate... did not intend to insult your technical intelligence regarding parallel/series combinations.  Misunderstood where you were going with your question. The basic joule thief oscillator is very simple in design and self oscillating around the feedback transformer winding. The circuit resonances and impudence's can be influenced very much by secondary loads, which can effect the output signal amplitude and working frequencies off resonance. The results can affect input current draw from source (AA's etc) where in certain circumstances additional circuits could influence the oscillator away from it's resonant frequency resulting in an actual decrease in source current, but as a result have made gains elsewhere! Jeanna has made much progress through her many experiments using additional inductor combinations etc. There is nothing magical about oscillator circuits... it's just amazing what can be accomplished through experimenting in advance from such a simple circuit. 

[jadaro2600]

@ Bill,

The more batteries you add in parallel of the same voltage will increase the available current capacity, how much current is drawn from the cells depends on the demand of the load circuit. Say the circuit draws 50mA adding more cells in parallel will not make any difference to the current demand. As you have already found out, because you have increased the current capacity by adding more cells in parallel your run time lasts much longer due to the extra available current.

@ Jadaro,

Sorry mate... did not intend to insult your technical intelligence regarding parallel/series combinations.  Misunderstood where you were going with your question. The basic joule thief oscillator is very simple in design and self oscillating around the feedback transformer winding. The circuit resonances and impudence's can be influenced very much by secondary loads, which can effect the output signal amplitude and working frequencies off resonance. The results can affect input current draw from source (AA's etc) where in certain circumstances additional circuits could influence the oscillator away from it's resonant frequency resulting in an actual decrease in source current, but as a result have made gains elsewhere! Jeanna has made much progress through her many experiments using additional inductor combinations etc. There is nothing magical about oscillator circuits... it's just amazing what can be accomplished through experimenting in advance from such a simple circuit.

No offense taken; I forgot to take into account the resonance of the circuit - foolishly though.  I see what you mean now. 

This is not something I've quite gotten to grips with.  The voltage may vary at the input, but the current usage will not? Or so, is this not what you mean - or in fact is that just the rub, the 'pressure' ( voltage ) dictates the current usage?

Is electricity doomed to a multi-variable equation?

[Pirate88179]

Jadaro:

From what I have seen, and learned thanks to Jeanna and MK1, etc. is that the base resistor has to be adjusted to "tune" to achieve resonance.  (I use a pot for this and then replace the resistor with whatever value the pot hit resonance with) Once you hit resonance, you will be using the least amount of power (mA's) for your device given the toroid permeability, the number of windings, wire gauges and transistor being used.  Gadgetmall added a ceramic cap to get his amp draw down even lower somehow.
I added the larger cell batteries because I knew they would run longer.  I did not expect any other results other than that.  I have lights I can use for many months without having to worry about replacing the battery.  I also have rechargeable batteries that I can juice back up using my earth battery outside so my lights are free.

Bill

[innovation_station]

Jadaro:

From what I have seen, and learned thanks to Jeanna and MK1, etc. is that the base resistor has to be adjusted to "tune" to achieve resonance.  (I use a pot for this and then replace the resistor with whatever value the pot hit resonance with) Once you hit resonance, you will be using the least amount of power (mA's) for your device given the toroid permeability, the number of windings, wire gauges and transistor being used.  Gadgetmall added a ceramic cap to get his amp draw down even lower somehow.
I added the larger cell batteries because I knew they would run longer.  I did not expect any other results other than that.  I have lights I can use for many months without having to worry about replacing the battery.  I also have rechargeable batteries that I can juice back up using my earth battery outside so my lights are free.

Bill

i know it goes deeper ... 

i have found that i can run at its natural .. it kinda finds its self after you tune to the core material ...

you do not need a tank .. with a cap tuned ..  dont need a pot ...  keep it super simple

all i need is 1 transistor ...  i choose the 2n2222a...  cuz your all going 2 lol

it does not fully drain the cap...  most likely a good thing ...  the  non tin can ones i have tested..  drew 22ma there bouts...  no big deal .... i could litterly run thousands from 1 stinkin cap from a aa

hummm   there is no limits ...  thats the crazy part ...  and some thought i went to the far side of the checker board ..  naw ... just opend my eyes .. 

try your new eyes out yet?    lol 

ist?