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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 11th August 2009, 02:34 PM   #481
iko is offline iko  Canada
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally posted by Salas
Is that horizontal part still double lined if you feed your calibration directly to the scope? Or there is a gremlin....
I'll have to check again tonight. Only the camera got that, with the naked eye I see only one line.
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Old 11th August 2009, 11:40 PM   #482
disco is offline disco  Netherlands
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Correlation between shutter speed and refresh rate?
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Old 12th August 2009, 12:47 AM   #483
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Very possible.
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Old 23rd August 2009, 07:41 PM   #484
disco is offline disco  Netherlands
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Default Salas Simplistic HV Regulator PCB

Last week I did a pcb design for this circuit. Since a couple of days I've got two of them working on a small (2A3) amplifier. They do a good job regulating and sonics are very good. Dynamic, precise but musical I would comment.

There are a few peculiarities about the circuit board.
- when the output is shorted, you'll have to replace the semi's
Some simple alterations can make it fool proof. More on this subject will follow;
- C1 (100uF/10V) is at a high potential. Do not touch while live if the can is not isolated;
- connecting wires shouldn't have excessive length for best results;
- for R2 and R7 it's better not to use metal film;
- R2 is mounted at the back;
- R3 and R9 (in the higher voltage version) are 82K/5W. If you can't locate these there's space to double a 150K/2W and a 180K/2W. These resistors get hot on full 400V!;
- the initial version suffered from heat building up in Q2 so I had to use a heatsink on the small TO-92 transistor. It occurred while the reg was dissipating 45mA at 295V into Q3 (over 13W). This renewed board is more spacious for better air flow around the components;
- if necessary a 47 ohm base stopper on Q2 can be inserted by breaking the copper trace between Q2 and C2 (see purple trace).

Hope you enjoy it as much as I do
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File Type: jpg resistors.jpg (88.0 KB, 767 views)
File Type: jpg HVshunt-plan.jpg (244.3 KB, 754 views)
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Last edited by disco; 24th August 2009 at 03:00 PM.
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Old 23rd August 2009, 07:47 PM   #485
disco is offline disco  Netherlands
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Default PCB for Simplistic Regulator HV

UNfortunately my file is too big for the forum (740KB). The resolution is 1200DPI for a 10x16cm board (eurocard size). It's located here.
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File Type: jpg comm_coolers.jpg (71.2 KB, 622 views)
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Old 23rd August 2009, 11:02 PM   #486
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Good tight job. Do you pre filter it? Any optional clamping zeners pads against shorting mishaps? I think you use the Swenson Mosfet HV reg too? Different sonics?
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Old 24th August 2009, 08:22 AM   #487
andRookie is offline andRookie  Norway
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Quote:
Originally Posted by disco View Post
UNfortunately my file is too big for the forum (740KB). The resolution is 1200DPI for a 10x16cm board (eurocard size). It's located here.
Canīt get the link to work. Something that can be fixed?
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Old 24th August 2009, 10:54 AM   #488
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
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Originally Posted by andRookie View Post
Canīt get the link to work. Something that can be fixed?
The link works in my browser but here it is again, attached.
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Old 24th August 2009, 01:06 PM   #489
disco is offline disco  Netherlands
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Quote:
Originally Posted by Salas View Post
Good tight job. Do you pre filter it? Any optional clamping zeners pads against shorting mishaps? I think you use the Swenson Mosfet HV reg too? Different sonics?
Well, experimenting is part of the fun, isn't it?

First tests were on a bench power supply at 345V input, 50mV ripple.
Second I made a 340V PSU with 2.3V ripple (ok, that's a lot).
Last I improved this PSU to 350V with 0.7V ripple (not too good either).
Both PSU's used small caps and a 10H choke, ripple was sinusoidal.
The voltage margin (input to output) was 40 to 50 volts, current margins were circa 50% to 40% (75mA to the load, 40mA to the sink etc).
With all tests I measured no AC at all after the reg.

Regarding the second part of your reply, I'm constructing a straight forward 2A3 amplifier to test the several regulators I've built so far.
There's metalwork involved so it takes some free float to complete.
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Old 24th August 2009, 01:08 PM   #490
disco is offline disco  Netherlands
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Quote:
Originally Posted by andRookie View Post
Canīt get the link to work. Something that can be fixed?
The link is OK, the problem might be a temporary unobtainable host because of 'data stress'. If not send me a PM.
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