Thanks for the replies, this circuit looks clean and simple, is the .1uF capacitor the one to be charged to 400V or I need to add it along the diode ?
The transistor makes it an oscillator circuit so the AC is solved but I am not sure if the diode and capacitor are in the right place or right orientation.Transformers are AC devices and may or may not do anything interesting with the circuit you have.
That is not correct, because there is no way for the capacitor to discharge. See the simulation I added to post #2.The transistor makes it an oscillator circuit so the AC is solved but I am not sure if the diode and capacitor are in the right place or right orientation.
Source: https://www.edn.com/mosfet-based-joule-thief-steps-up-voltage/
Thanks, capacitor discharge is not a problem I will have switches to disconnect the capacitor and connect it to some other circuit.That is not correct, because there is no way for the capacitor to discharge. See the simulation I added to post #2.
It still won't oscillate as you have drawn it and the transistor is never really turned on for any purpose at any time that I can see. You might want to consult your sources to see where you went wrong.Thanks, capacitor discharge is not a problem I will have switches to disconnect the capacitor and connect it to some other circuit.
I don't understand, it's the same circuit why mine does not work ? what's that vcap connection ? where does it go ?It still won't oscillate as you have drawn it and the transistor is never really turned on for any purpose at any time that I can see. You might want to consult your sources to see where you went wrong.
"vcap" is just a label on that particular net; it is used for plotting the voltage on the capacitor. It does not go anywhere. The circuit, as you have drawn it, can not and will not work for any pupose that I can devine. I don't understand either WTH you are asking for or about with respect to post #9I don't understand, it's the same circuit why mine does not work ? what's that vcap connection ? where does it go ?
In post #10 is the same problem transistor Base is shorted to the transistor Emitter...what I am asking about is just to charge the capacitor to 250V than with a switch disconnect the charging thing and keep the cap charged.hi Mark,
In post #9, the transistor Base is shorted to the transistor Emitter…it will not work.
E
No, it is the short from the base to emitter that is the problem. If you remove it then the capacitor will keep charging forever, untill something discharges it or breaks down.In post #10 is the same problem transistor Base is shorted to the transistor Emitter...what I am asking about is just to charge the capacitor to 250V than with a switch disconnect the charging thing and keep the cap charged.
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