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Old 14th February 2012, 01:28 AM   #2761
Salas is offline Salas  Greece
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Great caps for a CLC prefilter.
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Old 14th February 2012, 06:42 PM   #2762
stajo is offline stajo  Sweden
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I added some words around HV FETs and sinking in the Safety Practices, General and Ultra-High Voltage thread.

Please read, add or critisise.

best
Staffan
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Old 14th February 2012, 09:47 PM   #2763
JOIMONF is offline JOIMONF  Spain
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Hello, please lets me know if appliances of this circuit include to power field coil drivers.
Thanks, Jordi.
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Old 14th February 2012, 10:44 PM   #2764
Salas is offline Salas  Greece
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We don't know if you will not give us the requirements.
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Old 15th February 2012, 05:39 PM   #2765
JOIMONF is offline JOIMONF  Spain
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Ah! Oh!
Right, I wants to power up a vintage 8" field coil speaker, voltage should be around 95volts, and current 50mA. more or less.
Exact values only when tuned on the fly, because of the driver responsiveness depends on the acoustical application, open baffle in this case.
The main question here is to know if an electrodynamics coil acts as an fixed load.
The VCCS is a servo-controlled supply and designed for one specific fixed
load.
Or contrary the coil acts as an power amplifier and present a changing load to this supply, the VCCS will try to compensate....so, in effect they will be
working against eachother.
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Old 15th February 2012, 06:20 PM   #2766
Salas is offline Salas  Greece
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Better not bet on a shunt regulator. Shunt regulators are better than series regulators in absorbing EMF but can be finicky to a largely varying inductive load regarding their stability.
If you want to make one and see in practice its all to you, especially if you can spare it for some alternative application, but no sure predictions.
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Old 15th February 2012, 08:58 PM   #2767
JOIMONF is offline JOIMONF  Spain
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Ok. I see... thanks so much.
I suppose I can't resist the temptation and arrange a try, no matter if I see burning smoke. That's life, ja!
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Old 16th February 2012, 10:35 PM   #2768
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Hi Salas,
Today I have turned on phono stage and the rich ,natural sound from yesterday turned to lifeless and unpleasent.I measured the Uin ,Uout everything fine.Calculated the set current on R1.It is set to 50mA.When I measured the current it was 55mA.The IRF840 is unussualy cool.Do you think that IRF840 is burned somehow during start up.Before start up I have changed EZ80 to EZ81 and everything measured fine until listening.I thought that tube was reason but EZ80 in place again work the same.I am using 8microF-3.5H-80microF 3.5H-80microF prefilter.The both rectifier anodes have 200ohm resistance in series like in EZ80 datasheet and the sound was beautiful until today.Please help me if you have idea what might be the problem.
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Old 17th February 2012, 01:19 AM   #2769
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OK, I have burned IRF840.It was near cold on heat sink.The magic SSHV sound is here again.Obviously I was to fast during ON/OFF/ON, it haven't had chance to start normally. Thanks for ingenious regulator ,Salas.
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Old 21st February 2012, 12:24 AM   #2770
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I tried to built the SSHV 1 but upto now, having burnt more than twenty semicon (FET, LED, MOSFET, ZENER), still can't get it work. Can anyone suggest a step by step safe way to test the circuit? Thanks

Last edited by bigpandahk; 21st February 2012 at 12:38 AM.
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