Hello to everyone !
I am trying to know what type of circuit this circuit is. More specifically, I wanted to know why this combination of components make a low to high voltage converter. I also wanted to know how to increase the output - I was thinking changing the capacitor but I'm not sure...
Would be grateful if I got some useful answers.
I have attached images of the PCB for further info.
Some info :
Input = 3v
400V Cap
For more info, just ask
Best Of Luck
- Ermiya

 

http://www.dos4ever.com/flyback/flyback.html

 

http://www.dos4ever.com/flyback/flyback.html

Elaboration please....
With all due respect, I don't think a whole page of writing would help.

 

Elaboration please....
With all due respect, I don't think a whole page of writing would help.

EDIT : It might do ....

 

Much has been written on the subject; no point repeating it all here. Google "flyback converter".

 

If you want an answer, trace the board and post the schematic.

You didn't mention the output voltage, but increasing output voltage would likely require increasing the voltage rating of the cap. You have the board, do some experiments. Lower the voltage a bit and see if the output voltage changes.

 

Much has been written on the subject; no point repeating it all here. Google "flyback converter".

Thanks ... Will do
What about my other questions ?
EDIT : ANSWERED BY SOMEONE ELSE

 

If you want an answer, trace the board and post the schematic.

You didn't mention the output voltage, but increasing output voltage would likely require increasing the voltage rating of the cap. You have the board, do some experiments. Lower the voltage a bit and see if the output voltage changes.

Thanks for the info ...
If posting the schematic will help, will do that as soon as I finish tracing the board .

 

Try to goggle blocking oscillator or Joule thief. Because your circuit is a classic blocking oscillator. And changing the capacitor will not change the voltage. You need to change transformer turns ratio.

 

Will post a schematic soon to make sure of that.

 

Try to goggle blocking oscillator or Joule thief. Because your circuit is a classic blocking oscillator. And changing the capacitor will not change the voltage. You need to change transformer turns ratio.

So is it a flyback converter or a blocking oscillator ?

 

Your circuit is a self oscillating version of a flyback converter also known as a blocking oscillator.

 

Thanks to everyone who answered....
The schematic is taking a while ....

 

It looks like an inexpensive board with marginal room for improvement as it stands. You will probably find that doing anything to increase the output of that particular module will lead to its early demise, especially if you increase the input voltage.

A larger value of capacitor will store more energy but will also take longer to charge and if you go as far as upgrading the inductor, you might as well start from scratch.

 

It looks like an inexpensive board with marginal room for improvement as it stands. You will probably find that doing anything to increase the output of that particular module will lead to its early demise, especially if you increase the input voltage.

A larger value of capacitor will store more energy but will also take longer to charge and if you go as far as upgrading the inductor, you might as well start from scratch.

Thanks for the info. Realised this from the previous answer.
Extracted that this circuit is a self oscillating version of a flyback converted and is not worth modifying. The only question which remains I think is that do you have a better schematic of this circuit?

 

This website helped me understand a blocking oscillator....
http://www.interfacebus.com/transistor-blocking-oscillator-circuit.html