Simplistic Mosfet HV Shunt Regs - Page 408 - diyAudio
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Old 18th August 2013, 04:49 PM   #4071
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Let it go poty.
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Old 18th August 2013, 04:55 PM   #4072
Salas is online now Salas  Greece
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Quote:
Originally Posted by poty View Post
To Salas:
I did the simulation with the same CCS as in the base circuit of the cascode, but tuned for 3.6mA. I use other program, not LTSpice and maybe that is the answer to differences (different models and so on).
Something's missing because when applying a CCS on the error amp, especially when higher in mA than with the resistive load you MUST get more OLG. That should show several fold drop in Zo at least over a significant portion of your curves. But they look running at almost same level in most of your posted chart (last one with yellow and green lines).
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Old 19th August 2013, 05:34 PM   #4073
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Merlin, use whatever you think makes your sound better but always compare with minimum additions possible first. Just always use series resistance when you add shunt capacitors to the rail after this particular reg. It does not like them straight up.
Salas, finally I left the SSHV2 without the RC filter.
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Old 19th August 2013, 05:39 PM   #4074
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OK. It' normally the best arrangement.
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Old 28th August 2013, 12:58 AM   #4075
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Hello Salas

About the HF oscilation
I measure round 80Mhz on output SSHV2, can this be the switching from the IRF?
It's round 1Vtt
I use it in a phono stage and it's comes on the output of my amp (output from anode tube)
Can this be a problem?
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Old 28th August 2013, 01:45 AM   #4076
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Press the bandwidth limit button on the scope. There is no way it can oscillate at 80MHz. Its too high a frequency for it.
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Old 30th August 2013, 04:30 AM   #4077
Cassiel is offline Cassiel  Libya
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Hi Salas, I bought the parts for your regulator a long time ago but I never build it, now I'm about to but it's the old version and I have the parts for the 250 volts regulator. I have the MPSA92 not the 2n6520. My preamp current is 10mA, I plan to set the CSS for 20mA. 350 volts in, 300 volts out. Anyway my question is this: do you think it would survive? If you say NO NO, would be a good idea to use a 2K resistor in my CRC filter to go down to 300V?
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Old 30th August 2013, 04:37 AM   #4078
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Can you point me to the exact circuit you have bought the parts for, first? Is it the one in post#2?
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Old 30th August 2013, 06:47 AM   #4079
Cassiel is offline Cassiel  Libya
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That's right, post #2. My transformer is huge so another idea is to set the CCS for high current and use a dropping resistor of lower value. I'm talking about the resistor in the CRC filter. CCS for 50 mA and 1K resistor instead of 2K.
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Old 30th August 2013, 07:02 AM   #4080
Cassiel is offline Cassiel  Libya
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I don't care if the B+ out of the regulator is 250V instead of 300V, the problem is that after the tube rectifier and CRC filter my B+ is 355V and I'm afraid it might be too much for the circuit in post #2. But I really don't know that's why I'm asking.
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