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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 9th October 2009, 09:10 AM   #591
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by massimo View Post
The two heatsinked devices (silver heatsinks) you can see in the preamp pcb look like a pair of LM317 configured as CCS for the tubes heater. Not shown on schematic
They could be individual heater Iregs, I don't see the Rset and I don't see the plate load resistors on the photo though. Nor the antiparasitic beed chokes. I see 2X470R for grids close enough non the less on the cct, not on the photo. This one takes hands on debugging and good info. We can not derive much like that.
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Old 18th October 2009, 07:26 AM   #592
quanghao is offline quanghao  Viet Nam
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Hi Salas and ikoflexer!

How many value of C-R-C filter? It is good for Salas shunt??
And value of R between the two capacitors????

Because I want use all MKP capacitor for filter.
Thank
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Old 18th October 2009, 09:20 AM   #593
Stixx is offline Stixx  Germany
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Using a CRC or similar is mandatory before the Salas shunt in order to cut down ripple. Values you have to find yourself... best by using PSUD2 which is a great tool to simulate things easily. A good starting point would be something like 220uF-500R-220uF but it very much depends on the power transformer you are using. Do not forget to allow ~50V across the regulator and use at least a 10W resistor in the CRC.
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Old 18th October 2009, 09:41 AM   #594
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by Stixx View Post
Using a CRC or similar is mandatory before the Salas shunt in order to cut down ripple. Values you have to find yourself... best by using PSUD2 which is a great tool to simulate things easily. A good starting point would be something like 220uF-500R-220uF but it very much depends on the power transformer you are using. Do not forget to allow ~50V across the regulator and use at least a 10W resistor in the CRC.
Ok! thank!
So Use alot of MKp cap!
You can share for mee, in your pre use Salas shunt??
What is pre or Amli use Salas shunt???
EX:
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Old 18th October 2009, 02:19 PM   #595
Stixx is offline Stixx  Germany
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quanghao,
I am using Salas reg in two headphone amplifier (c this thread).
Works absolutely troublefree!
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Old 18th October 2009, 04:25 PM   #596
jkeny is offline jkeny  Ireland
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Has anybody done a comparison of this shunt reg against Swenson/Gary P's series Mosfet reg? Disco, I think you have tried both?
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Old 19th October 2009, 03:18 AM   #597
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by Stixx View Post
quanghao,
I am using Salas reg in two headphone amplifier (c this thread).
Works absolutely troublefree!
Ok! thank you can sent for me. your Salas shunt full cricuit, Ex: C-R-C filter???? becase i want use MKP cap for Salas shunt!
thank
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Old 19th October 2009, 04:56 AM   #598
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Up to 300-350V 50-60mA the TO-92 drivers can be OK with a mini sink. Harder current use for power amps at high voltage is beyond what it was made and tested for, its a basic circuit without protections, it may need experimental work with stronger BJT or whatever, don't over estimate its scaling.
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Old 19th October 2009, 07:58 PM   #599
le´flu is offline le´flu  Germany
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Hi Salas,
i just made a PCB for your Reg and there are a few questions left,
and i´m sorry if someone asked before, but.....

I use 240 Volts at anode resistors

1. What is the highest current your reg should be used for?
2. What voltagedrop should be planned for the reg?
3. Is it necessary to feed the anoderesistor directely from your
reg or is it alowed to put another cap after your reg? If so, whats
the max. capacitiy?

Greetings Ulf
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Old 20th October 2009, 06:11 AM   #600
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
1. 80-100mA has been reported, but 50-60mA is a good conservative limit up to 280V. Must individually sink the MPSA, or try with an MJE350. Beyond that is going to become akward.

2. 50V is a good ballpark value.

3. It has been used feeding locally decoupled B+ points of with a few uF caps, mainly film. One of the good things, is it does not have an output capacitor more than a small in the Zobel. Its a benefit. People who made it can tell what was the biggest capacitor locally on their audio that they fed with no problems.

*This is a very basic, weird Vref sporting, experimentally conceived regulator that happened to be tested with mainly line level applications, phono stages, headphone amps, and was liked enough. When pushed to deliver for amplifier current, or beyond 300V, I consider it uncharted territory. It does not have the protections, or the good low linear output impedance, or the proper output Mosfet drive scheme so to be a general workhorse. Although there are good reports from different users even in small amps under 300V and less than 100mA, don't get much enthusiastic. Its still dirt cheap to make and experiment with if you fancy. I did not prepare it with any serious investigation or general use intentions back then. That is why it is simplistic. This is 60's diy. No tech, psychedelic sound AND smoke occasionally.
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