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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 17th April 2011, 04:57 AM   #1741
vgeorge is online now vgeorge  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by 10y View Post
Depending on voltage output a nos az1 can supply about 100 mA at 300 V (philips datasheet)
So only two channels with one shunt possible.
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Old 17th April 2011, 08:12 AM   #1742
10y is offline 10y  Italy
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Quote:
Originally Posted by vgeorge View Post
So only two channels with one shunt possible.
Yes VGeorge,

at this point I will prefer to try a single dc raw with tx-rectifier-c-l-c line and after two shunt regs . I will see if my old az1 mesh will be sufficient strong on emission.

Cheers,
Anto
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Old 4th May 2011, 05:55 AM   #1743
albertli is offline albertli  Canada
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I placed my order to 'quanghao' for two boards and paid him through paypal over 2 weeks. I sent him couple email in between and tried to know when probably I'd have my two boards, but with no response. Please be warned not to send him any money before he clears this transaction.
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Old 4th May 2011, 01:49 PM   #1744
roger57 is offline roger57  Canada
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He seems a bit slow in responding when I sent him emails. 2 weeks is a little soon, so be patient, our mail system, specifically Canada Customs, can be a little slow!
Let us know how the boards and operation turn out.

Gary
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Old 9th May 2011, 03:31 PM   #1745
kacernator is offline kacernator  Czech Republic
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Default Shunt problem

Hi,

yesterday I had problem with Salas shunt reg. When I powered off the amp, something blew and smoked from regulator. It was working for two months without any problem so far.
This is my second experience with Salas reg that something suddenly blew off.
Version is "simpler simplistic Nov 09". Vin is 360V Vout is 290V.

It sounds superb, but i am now concerned with its reliability. I dont have gate protection zeners installed.
So I could install them and probably raise the gate stoppers to 330 Ohm?

Or does anyone know about other very good shunt reg design?

Thanks for advice.
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Old 9th May 2011, 03:52 PM   #1746
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Use the small Zeners on the gates anyway. Is there the MJE350 working near its Collector Emitter Vmax spec in your application?
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Old 9th May 2011, 04:07 PM   #1747
kacernator is offline kacernator  Czech Republic
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Quote:
Originally Posted by Salas View Post
Use the small Zeners on the gates anyway. Is there the MJE350 working near its Collector Emitter Vmax spec in your application?
Yes, the max spec of MJE350 is 300V and I am running it at 290V.
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Old 9th May 2011, 05:02 PM   #1748
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Don't know, that prototype of Nov2009 is still in service 315Vin,285Vout,40mA. Never blew. Has the gate Zeners non the less. HV, semis, and heat, are always potentially troublesome stuff on the other hand. Anyway, since higher Vmax PNP BJTs are hard to source, I will show you a bit later a schematic of how to cascode MJE350s for doubling their voltage spec and halving their dissipation. In general, keep it coolest temp possible and lower the Vin-Vo if you can. Sink the Jfet somehow with a little metal TO-92 winged cap or some improvised thing if its receiving some over 40C ambient heat from the sinks, its sensitive also.
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Old 9th May 2011, 05:05 PM   #1749
kacernator is offline kacernator  Czech Republic
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I cant find any substitutes for MJE350 for higher voltage in my country. What can I do?
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Old 9th May 2011, 05:51 PM   #1750
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
You can cascode them, with this mod. That is one potential issue solving with this mod. It may well had been a transient that killed it or something.
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