T&L Publications

Yeah,drive and feedback coils are on same core,I forgot to mention.All the 4 coils + feedback are on the same core.I'm sorry...

The biasing pot is part of voltage divider to get the Fet's in range. To allow disconnection of the internal FET diode, a separate diode can be added pointing to the drain (coil-diode-drain) This will unclamp the flyback emf on negative swings. The dotted diode is called the "parasitic" di...

I'm sorry, but i'm unable to attach the image.You can see it here:
http://img121.imageshack.us/i/mosfet.gif/

Hi People...
I need some help to try to arrange the oscillator circuit on the left of the picture, to drive the coils setup showed on the right with three IRF840.Thanks for any help.

Steve, you are G R E AT !
Thanks for all.I will post the resuts plus the pics of my work.
Best Regards,
Cyrano

If I add other three transistor with the polarity reversed ,in a parallel path on the circuit ,have you any idea were to connect the DPDT switch to change the sensing of ions?
Q3 have to be reversed,also?

Hi People!... I have decided to build a ion detector circuit I have found on a book.I'm not an electronic engineer, so I want to see if there is some people so gentle that can help me to make this project.Essentially, the circuit is the same posted here:http://www.sentex.net/~mec1995/circ/hv/niondet...

Ron..
Thermistors works at maximum 125C...
To work on thermoscapsules, I need at least a temp of 300C...

Great, Ron!
I Hope It Works!

Hi Ron
Thank you for your time.I dont need a precise temperature control, so a triac circuit is good...
I have to seal thermocapslues on wine bottles; I dont need a precise temperature control, so I think that a triac circuit is good...
Cyrano

Hi People... I need to control the temperature of an oven heating element.For that purpose I have found this kit: http://fadisel.com/cebek-electronic/dimers/2000-w-light-regulator-dimmer-cebek-i-16_R_293_290.aspx ,but the price is exaggerated to me,considering that the pieces costs less 5 bucks...Ha...

To Bob Scott: Ok, the coil is 0,24 ohms.This for a 37,5W coil. If I calculate the resistance of a coil four times bigger the starting values,ex.12V at 50AMPs (600W...),I got the same resistance:0,24 Ohms!!.This thing confuses me. I have here a two very different wattage and the same coil is good for...

I think that the coil is done better by mathematical calculation...I haven't copper wire to waste.

Hi People....
I'm inexperienced in this field, so I need your helps to find the right calculations to make a coil of copper wire for a DC electromagnet, that consumes 37,5W (3V at 12,5Amps...).I thank you in advance.
Best Regards,
Cyrano.

I quote from this page:http://www.kronjaeger.com/hv/hv/src/tv/ "Cascade modules are not suitable for rapid discharge, which occurs e.g. when arcing to ground. I lost several units this way. Even worse, the input AC source may be damaged through the extremely high voltage spikes occuring during ...