Akula0083 30 Watt Self Running Generator.

[Grumage]

Hi all,
Does anybody know the working freqquency of the TL494 on this circuit? My question is because the output current capability will depend on the transformer primary inductance and on the frequency. Limits imposed by the potentiometer seem too wide.

Dear Black_Bird.

A "little bird" told me 5 KHz !! 

Experiments will tell us more !!

Cheers Grum.

[Black_Bird]

Dear Black_Bird.

A "little bird" told me 5 KHz !! 

Experiments will tell us more !!

Cheers Grum.

Thank you Grum. My calculations, supposing AL of the core around 2000 nH/turns2 and a current of 2A ( 30W /15V)
, and also supposing the duty cycle of 45%, 15 turns at the primary led to a frequency of 5.68KHz. So your "little bird" confirms my calculations.

[TinselKoala]

Hi all,
Does anybody know the working freqquency of the TL494 on this circuit? My question is because the output current capability will depend on the transformer primary inductance and on the frequency. Limits imposed by the potentiometer seem too wide.

You are kidding, right? The people in this thread can't even settle on which output pin of the 494 to use, and it seems you can just start leaving components out all over the place, or substitute different ones, at will. Compare Groundloop's PCB specified components with what we have just seen in the last few posts.

Why not settle on one specific schematic before you start making PCBs or worrying about what frequency to use?  Once one schematic is "approved" and constructed, that can become a baseline from which variations can be tested to see if they help or hurt the desired performance.  But having three different people (at least) putting up substantially different schematics, each saying that they believe theirs is the right one to use... and then someone else comes along without an actual build, apparently, and tells you to leave parts out.... OK, fine. Have fun. You are making a mess that will have to be cleaned up later, but as long as it keeps you off the streets, it's fine with me.

[Dave45]

Lets take it a step further, the bemf from L1 causes the pos side of C3 to go high pos this draws current on the other side to go high neg after the bemf is dissipated through L2, L2 has a bemf that will cause the pos side of C3 to go neg this releases the high neg from the cap and pulses the electrode.

[Black_Bird]

You are kidding, right? The people in this thread can't even settle on which output pin of the 494 to use, and it seems you can just start leaving components out all over the place, or substitute different ones, at will. Compare Groundloop's PCB specified components with what we have just seen in the last few posts.

Why not settle on one specific schematic before you start making PCBs or worrying about what frequency to use?  Once one schematic is "approved" and constructed, that can become a baseline from which variations can be tested to see if they help or hurt the desired performance.  But having three different people (at least) putting up substantially different schematics, each saying that they believe theirs is the right one to use... and then someone else comes along without an actual build, apparently, and tells you to leave parts out.... OK, fine. Have fun. You are making a mess that will have to be cleaned up later, but as long as it keeps you off the streets, it's fine with me.

Hey, it was just a question from somebody who wants to build the circuit. For you knowledge, I'm and electronic engineer with more than 35 years experience and, despite that, I am not raging over people who know less than me. Sometimes the best solutions come from people with less knowledge but more ingenuity.