Simplistic Mosfet HV Shunt Regs - Page 177 - diyAudio
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Old 13th May 2011, 08:27 PM   #1761
hesener is offline hesener  Germany
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thanks a lot, very comprehensive answer!
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Old 13th May 2011, 08:29 PM   #1762
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Old 16th May 2011, 11:04 AM   #1763
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I'm using the reg for this lineamp schematic (Rp 15K, Rk100R, +Vs 180 & without 80K optional) but I have a doubt: the +Vs 180 is before Rp as specified in the schematic or is after Rp? because if it's after Rp the anode have only 40V, it's right?

Click the image to open in full size.

I have these questions because the reg without Rp can reach 180V directly to the anode.

Last edited by merlin el mago; 16th May 2011 at 11:08 AM.
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Old 16th May 2011, 12:13 PM   #1764
regal is offline regal  United States
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Anyone else tried PIO or teflon caps form C2&C3, is it worth the effort ?
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Old 16th May 2011, 12:45 PM   #1765
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Quote:
Anyone else tried PIO or teflon caps form C2&C3, is it worth the effort ?
Good caps do make a small difference... but YMMV.
I've tried ERO KP caps with good results. Teflon caps need forever to burn in and won't sound so good from the beginning...
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Old 16th May 2011, 01:31 PM   #1766
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Quote:
Originally Posted by regal View Post
Anyone else tried PIO or teflon caps form C2&C3, is it worth the effort ?
Bypass c2 with 0.022-0.047u Teflon if you got any proper in VDC around. Can you hear more detail in music?
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Old 16th May 2011, 01:38 PM   #1767
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Default Problem remains

Hi,

I have successfully implemented your cascoded version of the regulator. Everything was working fine for few hours, but when I hit the power off switch the leds and resistor around leds blew again. It is weird, because before this problem the regulator was working fine for two months. Clamping zeners were installed.
Any clue what should I be looking for?

Thank you.
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Old 16th May 2011, 02:17 PM   #1768
Salas is online now Salas  Greece
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Is there a possibility an over voltage occurs when you hit off? Is there a spark created on the switch after 2 months use on its contacts? Can you install an X type mains transient suppression capacitor across the switch? Also what is the load? Is it reactive, has inductance?
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Old 16th May 2011, 02:29 PM   #1769
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Is there a possibility an over voltage occurs when you hit off? Is there a spark created on the switch after 2 months use on its contacts? Can you install an X type mains transient suppression capacitor across the switch? Also what is the load? Is it reactive, has inductance?
When operated Vin is 350V, without load Vin is 370V,so no overvoltage. No spark on mains switch, although I do not have suppression capacitor installed - it could be that. The load is aikido amplifier. I forgot to mention, that when I switch the power off I switch 2k 5W bleeder resistor in to drain filter caps before regulator and this bleeder is connected from last C of CRC before regulator (PSU is CRC-regulator) - this could be the problem? But it worked fine before.
If it is the overvoltage spike created by the switch that is killing the reg then the spike must be very big in terms of voltage, right?
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Old 16th May 2011, 02:55 PM   #1770
Salas is online now Salas  Greece
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I am trying to guess, because especially when going off, things are supposed to be milder than when going on. The switching to bleeder is something not commonly practised. Lets solder the bleeders permanently first. No need to bleed more than 1-2mA so they can be there all the time as in most. If it will be blowing the leds still, lets take away the RC parallel to them. Did you notice any subjective difference with the cascoded by the way?
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