Simplistic Mosfet HV Shunt Regs - Page 12 - diyAudio
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Old 20th January 2009, 03:36 AM   #111
Salas is offline Salas  Greece
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Default Re: Class time!

Quote:
Personal preference would have larger pads for Q1 and the wire connections.
And maybe Q1 not so close to Q2? Its better to spread the heating points on the sink.
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Old 20th January 2009, 03:45 AM   #112
Salas is offline Salas  Greece
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Quote:
...and the large resistor with the parallel 1uF capacitor locks down the voltage going to the MPSA92 at about a diode drop below the supply...The resistor and capacitor in series prevent oscillation due to the negative feedback. Does that sound about right? [/B]
Actually the current that goes to that resistor is already ''locked'' by the ring of two CCS through the resistor. Thus the resistor's voltage drop is our voltage reference for the regulator.

There is no loop feedback. Its a Zobel that just smooths the ringing by termination.
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Old 20th January 2009, 10:06 AM   #113
Bitrex is offline Bitrex  United States
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Quote:
Originally posted by salas



There is no loop feedback. Its a Zobel that just smooths the ringing by termination.
It makes quite an impressive difference on the simulation, that's for sure.
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Old 20th January 2009, 11:59 AM   #114
Salas is offline Salas  Greece
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Indeed. I have shown on posts #20 & 21 too.
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Old 21st January 2009, 02:06 PM   #115
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Thanks, Gary for contributing with the enlightening lesson!
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Old 14th February 2009, 03:45 PM   #116
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Hi Salas

Got all the parts, and has been arrange it PTP like the Gary's Layout.

i got question about the tube rectifier EZ81. does this shunt reg retain the claimed benefits of the tube rectifier, such as warm sounding? if not, i would rather just use the sckottky diode that i have in my drawer. it rectify more spare voltage as well that i can have the spare 50v as you recommend.

should i go with tube rectifier or solid state rectifier?

thx in adv

erwin
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Old 14th February 2009, 05:21 PM   #117
Salas is offline Salas  Greece
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You can still hear the tube rectifier but to about the 20% the impact it would normally have with a passive CLC.
I would rectify both ways and see what happens in a particular system VS the particular tube rectifier. But only by keeping the 50VDC difference in all cases. If you cant have the 50V, go solid state.
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Old 15th February 2009, 02:37 AM   #118
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hi Salas

nice.. i got some heatsink confusion. attached the picture of several heatsink i got. can i use the smallest one on the irfp9240? the other one is cpu heatsink with fan. then the other one is for 2n3055. thx in advance

thats the board that i arrange with Gary's suggestion layout. haven't soldered them in. but should be find as i am going to prove read it again before soldering.

erwin
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File Type: jpg heats.jpg (46.4 KB, 1470 views)
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Old 15th February 2009, 03:18 AM   #119
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ops forgot to mention that i plan to regulate 200vdc to 140vdc with around 40mA current consumption for both channels of my preamp.

thx

erwin
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Old 15th February 2009, 08:45 AM   #120
Stixx is offline Stixx  Germany
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Erwin,
I don't want to speak for Salas but since I have built the same regulator (but waiting for my power trannie to test it...) I'd say those heatsinks should be fine for your application.
-->see post No 69 for the ones I'm using... (I cut down the first one since )
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