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Old 4th February 2013, 08:35 AM   #191
dadod is offline dadod  Croatia
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Quote:
Originally Posted by bcarso View Post
One more caveat that occurs: again, under fault conditions, the power DMOS parts can see out-of-spec magnitudes of gate-source voltages. Although zeners for protection are somewhat high capacitance, you could bias one "on" and use a small signal diode like a 1N4148 to be normally reverse-biased and only clamp a gate for a good-sized but in-spec overvoltage condition.
Have I got it correctly?
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Old 4th February 2013, 09:11 AM   #192
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Have I got it correctly?
Yes, that's exactly what I'd recommend. It may be that the zeners (without the standby biases) alone are low-enough capacitance, but with the additional diodes you're even closer to adding negligible capacitance.
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Old 7th February 2013, 11:28 AM   #193
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This is the shuntreg PCB, suggestions welcome.
dado
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Old 17th February 2013, 03:20 PM   #194
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This is finall tested shunt regulator version. I built one channel for now, tested it with no load and with a load and it looks stable and no visible riple or high frequency oscilation.
Now I have to assemble second channeland test it with the lineamp(GainWire).
dado
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Old 17th February 2013, 03:36 PM   #195
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You could integrate D3 and D5 with R3 for lower DC impedance and less parts.
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Old 17th February 2013, 04:23 PM   #196
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You could integrate D3 and D5 with R3 for lower DC impedance and less parts.
What you mean by integrate, could you explain? Look post #191 and #192.
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Old 17th February 2013, 05:31 PM   #197
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Replace R3 with D3 and R22.
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Old 17th February 2013, 08:20 PM   #198
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Replace R3 with D3 and R22.
I don't think that is a good idea.
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Old 17th February 2013, 09:15 PM   #199
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I don't think that is a good idea.
There is a way to find out.
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Old 18th February 2013, 03:40 AM   #200
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Dado it looks very good
How about using those supertex depletion mosfet in place of the jfet's? They have higher early voltage than the 2sk170 at those low Vds. I just do not know if they are noisier.
I will buy some of this deplection mosfets for triyng some ideas.
You can also cascode the main current sources for higher output impedance of the ccs. But your regulator is very good as it is.
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