very high and powerful voltazh voltage from a small voltage

[jehdds]

Question for you all.
I do not have a ferrite toroid core that large.  I do however have a transformer core that is a roll of metal of I assume lamination core type.  Would this work as well as the ferrite for this project?
If anyone has used this for this purpose I appreciate the feedback.  My guess is that it would work.
Thank you for fielding this.
Very Best Regards,
jehdds aka diveflyfish

[gyulasun]

Hi diveflyfish,

If your core has a normal 4% Si content like many normal mains transformers or motors do than it is not sure it can operate efficiently like a ferrite would at the some kHz frequency range this circuit works.  IF you have a Hypersil type core then it can go up some hundred Hz with good efficiency, maybe up to some kHz with reduced efficiency.  IF your core was meant originally to serve for coupling audio power in audio amplifiers then you have a good core material for the kHz range.

Gyula

[Magluvin]

Hi diveflyfish,

If your core has a normal 4% Si content like many normal mains transformers or motors do than it is not sure it can operate efficiently like a ferrite would at the some kHz frequency range this circuit works.  IF you have a Hypersil type core then it can go up some hundred Hz with good efficiency, maybe up to some kHz with reduced efficiency.  IF your core was meant originally to serve for coupling audio power in audio amplifiers then you have a good core material for the kHz range.

Gyula

Could it be wound with many more turns to lower the freq of operation?

Mags

[gyulasun]

Hi Mags,

Yes I believe so,  though I have not pondered on what constitutes the oscillation frequency in this specific circuit,  in a normal blocking oscillator the base-emitter capacitance and the series R do influences it. The L value of the coil in the collector does not have a crucial effect on the frequency, the base-emitter capacitance has the biggest effect I had found with blocking oscillators years ago.  And this circuit does seem to resemble a blocking oscillator.  Perhaps the Joule thief builder guys have some opinion too.

Gyula

[Magluvin]

Hey Gyula

So the freq of operation is in the transistor circuit? 

The coil that is connected to the base of the transistor, does it turn off the transistor due to influence of the driver coil or do the secondaries?  Would be interesting to know. ;]

If the driver coil affects the base coil then the freq happening is not necessarily the freq that the secondaries work best at.  So maybe just use one input coil and drive it from an outside source to see if input/output could be better.

Mags