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Old 15th June 2008, 09:38 PM   #541
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Quote:
Originally posted by carpenter



I removed those four caps and everything is looking good; in fact, the sine wave looks exactly the same on the simulator. Thanks a bunch for the education.

woodie - I didn't analyzed these circs so thoroughly ( because you fire them almost fast as LL build amps ) but point is -try to construct them with smallest number of caps you can ;

so - in case of mosfet/jfet if you anywhere have CCS ( for biasing ) - then try to tie gates to gnd potential (DC wise) , and let CCS to do what's his role - to bring his side where it needs to be ;

etc .

you didn't answered my question regarding that sole choke ;
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Old 15th June 2008, 09:48 PM   #542
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Quote:
Originally posted by Zen Mod

you didn't answered my question regarding that sole choke ;
I thought I did in the last couple of post....... #538

Love you like a brother!
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Old 15th June 2008, 10:10 PM   #543
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Quote:
Originally posted by carpenter


I thought I did in the last couple of post....... #538

.......
now you know that I'm 4eye




Quote:
Originally posted by carpenter


....

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well - you have no choice ........ I'm a peach
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Old 16th June 2008, 12:02 AM   #544
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Peach
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Old 4th July 2008, 10:15 PM   #545
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I laid out a version the uses the 2SJ74 jfet at the input. I also paid close attention to aligning current to voltage on the LU1014D ID/VDS graph. Just for the fun of it, I also did the same for the IRFP044N mosfet. It's current is rated at roughly 6 amps to 10 volts (V/D) with a VGS of slightly under 4.5V.

If anyone sees an ugly here or there, please feel free to let me know.

BTW, it takes two LU1014D jfets to deliver enough current to hit the IRFP044N sweet-spot.

I'm not entirely up on the use of the 2SJ74, and can't seem to understand how to graph its parameters. Any help in that dept. would be appreciated. As designed, each 2SJ74 delivers 4.5mA to each LU1014D.
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Old 6th July 2008, 07:21 AM   #546
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I'm probably over-doing it with the design bit, but this software is a blast to use.

Here's another idea--you know how a little girl can wrap her dad around her little finger? That concept reminds me of what I'm doing with this design. I affectionately think of it as my version of "Daughter of Zen".

I'm proposing the use of a ZVN3310/IRFP044N cascode arrangement. I may be nuts, but the sim says it will work. It's just strange enough that I'll build this one.

Imagine an itty-bitty ZVN3310 controlling the big brute IRFP044N above. I bias up the IRFP044N separate from the ZVN3310. I don't know if this can be done in reality, but it could sound pretty sweet should it work.

Here's the concept schematic (more fine tuning to come, and yes, I realize that the IRFP044Ns are going to fry at the proposed settings) Water cooling anybody?:
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Old 8th July 2008, 08:15 AM   #547
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Here's a larger version with more gain:
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Old 23rd February 2013, 12:19 PM   #548
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Hi,

I spent some hour reading this jolly thread. I'm thinking of building me a ZV7-T with some custom wound toroids. www.toroidy.pl can make up to 3 kVA customwound so I wonder if anyone has the opinions of ideal values. I think Magura came up somewhere in the beginning of the thread with that each winding should be at least 80 mH and less then 3 ohm DCR. A 3 kVA toroid would do thet easily of course but I wonder if anyone has opinions om what values to aim for. I guess that a 3 kVA wound like a 2*115 V would end up in the region 1 H, 1 ohm :ish.

Best regards
Staffan
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Old 23rd February 2013, 12:28 PM   #549
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more, the merrier
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Old 23rd February 2013, 12:40 PM   #550
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More inductance u mean? So at 3 kVA I should spec more turns?
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