Search found 18 matches

by Cyrano
Mon Jul 05, 2010 3:23 am
Forum: General Discussion
Topic: I need an help to redraw a circuit,please...
Replies: 6
Views: 1346

Re: I need an help to redraw a circuit,please...

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...
by Cyrano
Mon Jul 05, 2010 1:54 am
Forum: General Discussion
Topic: I need an help to redraw a circuit,please...
Replies: 6
Views: 1346

Re: I need an help to redraw a circuit,please...

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" diode. It is...
by Cyrano
Sun Jul 04, 2010 11:08 am
Forum: General Discussion
Topic: I need an help to redraw a circuit,please...
Replies: 6
Views: 1346

Re: I need an help to redraw a circuit,please...

I'm sorry, but i'm unable to attach the image.You can see it here:
http://img121.imageshack.us/i/mosfet.gif/
by Cyrano
Sun Jul 04, 2010 11:06 am
Forum: General Discussion
Topic: I need an help to redraw a circuit,please...
Replies: 6
Views: 1346

I need an help to redraw a circuit,please...

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.
Image
by Cyrano
Mon Jan 11, 2010 1:15 am
Forum: General Discussion
Topic: Help to build a Ion Detector, please....
Replies: 7
Views: 2898

Re: Help to build a Ion Detector, please....

Steve, you are G R E AT !
Thanks for all.I will post the resuts plus the pics of my work.
Best Regards,
Cyrano
by Cyrano
Sun Jan 10, 2010 9:50 am
Forum: General Discussion
Topic: Help to build a Ion Detector, please....
Replies: 7
Views: 2898

Re: Help to build a Ion Detector, please....

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?
by Cyrano
Sun Jan 10, 2010 7:27 am
Forum: General Discussion
Topic: Help to build a Ion Detector, please....
Replies: 7
Views: 2898

Help to build a Ion Detector, please....

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...
by Cyrano
Mon Dec 28, 2009 8:36 am
Forum: General Discussion
Topic: I need a circuit schematic of 2 KW light dimmer...
Replies: 12
Views: 2739

Re: I need a circuit schematic of 2 KW light dimmer...

Ron..
Thermistors works at maximum 125C...
To work on thermoscapsules, I need at least a temp of 300C...
by Cyrano
Mon Dec 28, 2009 1:52 am
Forum: General Discussion
Topic: I need a circuit schematic of 2 KW light dimmer...
Replies: 12
Views: 2739

Re: I need a circuit schematic of 2 KW light dimmer...

Great, Ron!
I Hope It Works!
by Cyrano
Sun Dec 27, 2009 1:23 pm
Forum: General Discussion
Topic: I need a circuit schematic of 2 KW light dimmer...
Replies: 12
Views: 2739

Re: I need a circuit schematic of 2 KW light dimmer...

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
by Cyrano
Sun Dec 27, 2009 7:29 am
Forum: General Discussion
Topic: I need a circuit schematic of 2 KW light dimmer...
Replies: 12
Views: 2739

I need a circuit schematic of 2 KW light dimmer...

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...
by Cyrano
Mon Nov 23, 2009 9:44 am
Forum: General Discussion
Topic: I need help on how to make coil calculations...
Replies: 7
Views: 1182

Re: I need help on how to make coil calculations...

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...
by Cyrano
Mon Nov 23, 2009 9:05 am
Forum: General Discussion
Topic: I need help on how to make coil calculations...
Replies: 7
Views: 1182

Re: I need help on how to make coil calculations...

I think that the coil is done better by mathematical calculation...I haven't copper wire to waste.
by Cyrano
Mon Nov 23, 2009 8:05 am
Forum: General Discussion
Topic: I need help on how to make coil calculations...
Replies: 7
Views: 1182

I need help on how to make coil calculations...

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.
by Cyrano
Sun Oct 18, 2009 12:44 pm
Forum: General Discussion
Topic: I need help on high voltage resistor....
Replies: 16
Views: 2432

Re: I need help on high voltage resistor....

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 rapid...