Simplistic Mosfet HV Shunt Regs - Page 91 - diyAudio
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Old 16th January 2010, 11:48 AM   #901
Salas is offline Salas  Greece
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Quote:
Originally Posted by guglielmope View Post
The 2sk170 is ok!

Vg Irf840=0,01V
The 840 isn't opening? Is that one OK? Maybe a 8-12V Zener guarding its gate? Between ground and gate.
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Old 16th January 2010, 12:22 PM   #902
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I'll try a new one.
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Old 17th January 2010, 02:18 AM   #903
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I looked for LEDs having known 1.7V on voltage. On mouser, only some red LEDs are rated 1.7V: LED, and this is the data sheet of one of those: http://www.kingbrightusa.com/images/.../WP7104LID.pdf, so I wonder if I miss anything?
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Old 17th January 2010, 02:27 AM   #904
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I usually prefer to use what I have on hand, and since I had lots of 2.1V LEDs, instead of two LEDs I used one LED and a resistor. The disadvantage is that one has to then optimize the value of the resistor. Perhaps it may work for you too though, if it ends up being problematic finding the 1.7V LEDs.
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Old 17th January 2010, 03:01 AM   #905
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Thanks.
I'm not sure if there's any problem, I'm only looking for known 1.7V LEDs.
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Old 18th January 2010, 05:51 AM   #906
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Hi Salas, Hi all!
I finis Salas shunt PCB, but my pCb is wrong, So I can sent them to you 5 gift now. I think I wil make it a gain, i sent it later for you!
Im very, very sorry about this PCb! Thank you!
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Old 18th January 2010, 06:05 AM   #907
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Quote:
Originally Posted by guglielmope View Post
I'll try a new one.
Any news with debugging it? Tried a new 840, checked all semis connections and orientations? Meanwhile, I got a suspicion that may when over 300V, those little -400V PNPs are struggling somehow. So I just thought that if it will not work on you with a single driver BJT, you may utilize some leftover MPSA92s for a cascode so to cut the dissipation and Vce in half. As a solution, it is even faster. If, it will not try to oscillate.
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Old 18th January 2010, 06:27 AM   #908
Salas is offline Salas  Greece
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Quote:
Originally Posted by quanghao View Post
Hi Salas, Hi all!
I finis Salas shunt PCB, but my pCb is wrong, So I can sent them to you 5 gift now. I think I wil make it a gain, i sent it later for you!
Im very, very sorry about this PCb! Thank you!
You do well you check because people if with a PCB, don't think twice, they put it to work. And here is high voltage. So no letter bomb gifts for now fellas.
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Old 18th January 2010, 08:28 AM   #909
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schematic at post #891

Current passing through R5? (voltage drop on R5)
Vgs for IRF840 is only 20V
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Old 18th January 2010, 12:18 PM   #910
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Just under 1mA. A transient could have passed during start up though. Gugliemo will give us more info about his debugging. Maybe he could also use a larger value trimmer just in case his 2SK170 has strong Idss.
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