Author Topic: 101 plate cell, G board and Toroid ..........  (Read 22585 times)

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Re: 101 plate cell, G board and Toroid ..........
« Reply #32 on: December 13, 2012, 03:48:06 am »
Ill asume tunning the g board is the same as the e board...I only have one probe so  the only way i could do it was take a 1uf cap (? 1nf?)  to each of the outputs of the board and take those to the probe... start with the lowest one and get the pulse width as narrow as you can at 10.7, then get the next one at the right frequency.. 20 somethin i think .. the goal there is to get the 2nd one inside  the 10.7( just barely out untill they add... the amplitude will rise) and then do the same with the 42.8. Tunning the pulse width is a pain since you want the pulse width as narrow as possible but the main thing is getting the amplitude to rise  with adding the pulses together.IWhen you  have it right the 10.7 amplitude will be higher as it should have all 3 pulses added together ... the next one will b a little lower and then the 42.8 should be as it is from the board.

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Re: 101 plate cell, G board and Toroid ..........
« Reply #33 on: December 13, 2012, 03:50:29 am »
Under Kevins project are a multitude of items.
Can you pinpoint a little?

ALL of mine were deleted along with a few other ppls.... we got pissed off because a bad apple was spoiling the forum.. more less that person killed that group.Chris might have them archived.. im still waitin his responce from facebook.

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Re: 101 plate cell, G board and Toroid ..........
« Reply #34 on: December 13, 2012, 03:53:27 am »
That tuning method sounds correct.
The board rev's had some changes I understand.
The G-board is using a mosfet driver that has very quick timing in the double digit nanoseconds range for quick rise and fall times.
Don't know if some MOV's were removed.
Do all the boards have the large diodes?

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Re: 101 plate cell, G board and Toroid ..........
« Reply #35 on: December 13, 2012, 04:01:24 am »
That tuning method sounds correct.
The board rev's had some changes I understand.
The G-board is using a mosfet driver that has very quick timing in the double digit nanoseconds range for quick rise and fall times.
Don't know if some MOV's were removed.
Do all the boards have the large diodes?

Im not sure on the diodes.. i would have to look it up... i have a pack of mur 410's .

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Re: 101 plate cell, G board and Toroid ..........
« Reply #36 on: December 13, 2012, 04:03:46 am »
The E and  G boards were two completely different versions. I don`t think you can really compare the two. I must admit, in all my tuning I have always been tuning the 42 first. And I haven`t been keeping them in proper relation to each other either. I will be going at it from a different angle from now on.

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Re: 101 plate cell, G board and Toroid ..........
« Reply #37 on: December 13, 2012, 04:05:31 am »
Yes Mur410,s.
Look rather large like they can take some amperage.
The board has led's on each mosfet (IRF540Z).
Led on 12v  supply and led on 8v supply regulators.
Large MOV on DC battery supply.
3 pots per 556, PWwavelength, fine and coarse.
Didn't notice frequency??? maybe that's the fine and coarse adjusts.

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Re: 101 plate cell, G board and Toroid ..........
« Reply #38 on: December 13, 2012, 04:17:19 am »
Yes Mur410,s.
Look rather large like they can take some amperage.
The board has led's on each mosfet (IRF540Z).
Led on 12v  supply and led on 8v supply regulators.
Large MOV on DC battery supply.
3 pots per 556, PWwavelength, fine and coarse.
Didn't notice frequency??? maybe that's the fine and coarse adjusts.

yeah i cant remember the ratings on them diodes.. im not sure if the FETs i have were from the E board  or what but I have 3 IRF PS3810s'
All i have is a huge laminated torroid so if i get back into actually being able to build on his work ill have to do a lower harmonic.

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Re: 101 plate cell, G board and Toroid ..........
« Reply #39 on: December 13, 2012, 04:37:56 am »
Those are Hexfet Mosfets whatever that means.
Your rise and fall time are in triple digit Nanoseconds and a little higher on avalanche current or and pulsed current.
Not much difference.
The fet drivers are going to be different.
A while back he used optocouplers on the boards.
Looks like the MUR410's are rated at 4amp, with 150amp surge and have fast recovery rate in double digit nanoseconds.
The G-board has quicker rise and fall time.

I think the loads on the pulse supply from the 12v battery is going to be in the milliamps.
Was anything ever posted on the load of the 12volt supply to the primary's?
« Last Edit: December 13, 2012, 04:55:18 am by komtek »