BOSOZ PSU for 150Vdc?
Here is the original BOSOZ PSU.
Of course I would use only the + half of the PSU with 7x22V Zeners to get 154V. Allowing for the
approximately 3.7 volt loss from MOSFET Gate to Source pins the
output of Q101 would be 150 volts DC.
What do you think??
Tyimo
Here is the original BOSOZ PSU.
Of course I would use only the + half of the PSU with 7x22V Zeners to get 154V. Allowing for the
approximately 3.7 volt loss from MOSFET Gate to Source pins the
output of Q101 would be 150 volts DC.
What do you think??
Tyimo
Attachments
Re: PSU for SEWA tubepreamp
Excuse my igonorance.
But what is BOSOZ?
is it maybe the balanced preamplifier ...
If you need a single end high voltage (150 max) supply
.. with not too much current say max 20-50 mA
.. I have a very nice one I designed from my own idea
I have tested it in MultiSim
Very precise regardless of
supply variations (line regulation)
load variations (load regulation)
It is using only TL431 (max 36V) as reference and a couple of higher voltage transistors.
I use TL431 at 30 Volt and VBE multiplier circuit.
(in power amplifier we use VBE multiplier to set output bias current
0.65 V is multiplied with use of a couple of resistors, and trimpot)
I think in my original test version, I have 120 V output. ( 4x30 Volt )
But could be modified to 150.0 Volt output.
I think this is a better way, than using zener + noise reduction filter.
TL431 has rather low noise level + Has very good temperature coefficient.
Zener has NOT got low temperature coefficient.
But this is no big deal in many circuits, where exact voltage supply is not the main thing.
But more important is that supply is clean and has got very little ripple voltage, hum.
Tyimo said:
Excuse my igonorance.
But what is BOSOZ?
is it maybe the balanced preamplifier ...
If you need a single end high voltage (150 max) supply
.. with not too much current say max 20-50 mA
.. I have a very nice one I designed from my own idea
I have tested it in MultiSim
Very precise regardless of
supply variations (line regulation)
load variations (load regulation)
It is using only TL431 (max 36V) as reference and a couple of higher voltage transistors.
I use TL431 at 30 Volt and VBE multiplier circuit.
(in power amplifier we use VBE multiplier to set output bias current
0.65 V is multiplied with use of a couple of resistors, and trimpot)
I think in my original test version, I have 120 V output. ( 4x30 Volt )
But could be modified to 150.0 Volt output.
I think this is a better way, than using zener + noise reduction filter.
TL431 has rather low noise level + Has very good temperature coefficient.
Zener has NOT got low temperature coefficient.
But this is no big deal in many circuits, where exact voltage supply is not the main thing.
But more important is that supply is clean and has got very little ripple voltage, hum.
Re: 150Vdc SS regulated PSU
Hi Tyimo,
Right here
Your circuit makes a good variable power resistor, but there's nothing to "regulate stiff" the voltage. If your source voltage is steady, no worries. If it varies say 10% around dinnertime because everyone turns on an oven, you need a zener reference for the gate.
In a tube forum, I'm surprised no one suggested a VR150
Cheers!
Hi Tyimo,
Tyimo said:Geek!!
Where are you?!?
Right here
Your circuit makes a good variable power resistor, but there's nothing to "regulate stiff" the voltage. If your source voltage is steady, no worries. If it varies say 10% around dinnertime because everyone turns on an oven, you need a zener reference for the gate.
In a tube forum, I'm surprised no one suggested a VR150
Cheers!
high voltage regulator using TL431 shunt diode
Tyimo
... and others.
It is useful to have a good high voltage regulator
in tube circuit, not at least.
My idea for a high precision and low noise is My Attachment.
It uses the Vbe multiplier, we can see in most any solid state power amp.
I guess we all have seen the set up in my figure A.
The volt across the lower resistor, 1k in my figures,
is multiplied by the upper resistor.
In figure B. the Voltage base-emitter is multiplied with x~4.9. ( {3.9+1} / 1 )
In figure C. I have raised the voltage across the 1k resistor
by adding 2 diodes to emitter.
The result gives also a higher output at top of this transistor shunt diode.
Such a voltage mutliplier works the same way as a Zener Diode,
but the good things are several.
- Adjustable, with resistors
- Lower noise
In figure D. finally is my idea.
Using the TL431, an adjustable shunt diode IC, with
- rather low noise
- good temperature stabilty
- possible output voltage can be set 2.5 - 36 Volt
This TL431 is in my circuit set to ~ 30 Volt
and this is multiplied by ~ 5.
And so we have 'zener diode circuit' at 150.0 Volt, with good quality output.
The voltage across TL431 = 30 ( max 36V )
The voltage across transistor 2N5551 = 120 ( max 160V )
It is all within the components max margin.
Regards
lineup
Lineup Audio Rgulators
http://lineup.awardspace.com/
Tyimo
... and others.
It is useful to have a good high voltage regulator
in tube circuit, not at least.
My idea for a high precision and low noise is My Attachment.
It uses the Vbe multiplier, we can see in most any solid state power amp.
I guess we all have seen the set up in my figure A.
The volt across the lower resistor, 1k in my figures,
is multiplied by the upper resistor.
In figure B. the Voltage base-emitter is multiplied with x~4.9. ( {3.9+1} / 1 )
In figure C. I have raised the voltage across the 1k resistor
by adding 2 diodes to emitter.
The result gives also a higher output at top of this transistor shunt diode.
Such a voltage mutliplier works the same way as a Zener Diode,
but the good things are several.
- Adjustable, with resistors
- Lower noise
In figure D. finally is my idea.
Using the TL431, an adjustable shunt diode IC, with
- rather low noise
- good temperature stabilty
- possible output voltage can be set 2.5 - 36 Volt
This TL431 is in my circuit set to ~ 30 Volt
and this is multiplied by ~ 5.
And so we have 'zener diode circuit' at 150.0 Volt, with good quality output.
The voltage across TL431 = 30 ( max 36V )
The voltage across transistor 2N5551 = 120 ( max 160V )
It is all within the components max margin.
Regards
lineup
Lineup Audio Rgulators
http://lineup.awardspace.com/
Attachments
Hi Tyimo,
20mA is plenty. BOSOZ PSU is overkill, but Bas sells the boards cheap.
Personally, I'd use this:
http://geek.scorpiorising.ca/Geek-0.html
Only because i have the parts kicking around and it's a workhorse.
But do experiment. Try simple L-C or C-L-C, as long as the B+ doesn't go above the schematic limit. Lower OK by 20% and still maintain good performance.
Cheers!
20mA is plenty. BOSOZ PSU is overkill, but Bas sells the boards cheap.
Personally, I'd use this:
http://geek.scorpiorising.ca/Geek-0.html
Only because i have the parts kicking around and it's a workhorse.
But do experiment. Try simple L-C or C-L-C, as long as the B+ doesn't go above the schematic limit. Lower OK by 20% and still maintain good performance.
Cheers!
Tyimo said:
I see you both, Tyimo & Geek does not like my idea
Well, suit yourselves
.. what am I doing here ???There are other here, that understands the benefits and will use my great idea ....
There are 2 kinds of regulators, basically: Series and Parallel
Nelson Pass and others using Zeners + 1 Pass transistor, for increase current
are into Parallel Regulation.
Myself also prefers Parallel Regulation, using shunt diodes or zeners, if possible.
This is what my circuit is about.
To try to make as perfect constant high voltage as possible
with excellent precision and quality.
Another reason is: I avoid using ZENER DIODES in any audio circuit.
We do not need to. There are good alternatives around.
Zeners ARE NOISY in compare.
And they have Not very good temperature stability.
The Geek diagram is not bad, but is a Series Regulator.
And it uses ZENER diode, 82Volt.
This is why I wouldn't use it.
Not for 10-20 mA!
And when current is fairly constant.
In these cases parallel regulators will do very good.
Regards
lineup
a true geek does not have to call himself this 
Re: Re: 150Vdc SS regulated PSU
bla bla
what is this:
btw
lineup..........with lotsa smilies.......you are often on edge to be rude
that's not just language question
lineup said:
I see you both, Tyimo & Geek does not like my idea :...........................................
Regards
lineup
bla bla
what is this:
Geek said:Hi Tyimo,.....................................
In a tube forum, I'm surprised no one suggested a VR150
Cheers!
btw
lineup..........with lotsa smilies.......you are often on edge to be rude
that's not just language question
Re: Re: Re: 150Vdc SS regulated PSU
it is lucky diyaudio has got a few nice people to compensate for me
like Zen Mod, even if I can't see that he is on topic much
in my topic
Tyimo
- you go for Geek regulator
I am sure he will support you nicely
and the result will be very good.
Geek
- thanks for publishing your regulator
I may have use for it, some time,
even if like I told you - I nowadays prefer Shunt Regulators with parallel operation.
( There was a time when I was into Series Regulators and used them frequently - still do a few times - when parallel won't do )
Regards to Some - you will know this your self, who
and Not to other - you will feel this, too
lineup
Lineup Audio Lab
... has added one more to his list
Zen Mod said:
it is lucky diyaudio has got a few nice people to compensate for me
like Zen Mod, even if I can't see that he is on topic much
in my topic
Tyimo
- you go for Geek regulator
I am sure he will support you nicely
and the result will be very good.
Geek
- thanks for publishing your regulator
I may have use for it, some time,
even if like I told you - I nowadays prefer Shunt Regulators with parallel operation.
( There was a time when I was into Series Regulators and used them frequently - still do a few times - when parallel won't do )
Regards to Some - you will know this your self, who
and Not to other - you will feel this, too
lineup
Lineup Audio Lab
... has added one more to his list
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