Akula0083 Light No3 - Dual TL494

[electroon]

what is the blue part or FNR109, can anyone explane it? How can we find it? What is the equivalent part of blue part (or FNR109) ?? please see the attached picture.

[MarkE]

what is the blue part or FNR109, can anyone explane it? How can we find it? What is the equivalent part of blue part (or FNR109) ?? please see the attached picture.

It looks like a MOV used to protect the IRF510 from overvoltage.  A search turns up discussion of that part on the Overunity Research forum about a year ago.  Transistors that turn off quickly can be damaged or destroyed by the inductive kick back of stray inductance in the wiring, and/or slow turn-on of the alternate current path, such as through a diode.  Snubber R-C networks, TVS devices and such are commonly used to limit the voltage of the inductive kick back.  Good layout or wiring practice is often all that is needed.  If you do use a MOV or other TVS device, it will only be as effective as its ability to redirect current around the MOSFET.  That means that the TVS device should be right across the drain and source leads as close to the body of the MOSFET as possible.

[eugene900]

Here is now his new circuit Number 4.
He will bring this with him to Germany soon.
So I hope I can have a look at it.

http://youtu.be/DnuXqnTlJNM

Regards, Stefan.

I replicated this circuit and (what a surprise) Not Working 

[electroon]

dear Russian friends, please help!
how can I succeed on that circuit??

[syedanas]

Is this same as akula's concept? https://www.youtube.com/watch?v=UYN0mgBq2gk