Using the HYPNOTIZE as a general shunt reg PCB - Page 5 - diyAudio
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Old 22nd January 2010, 01:33 PM   #41
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Salas,
Can you please post the updated schematic refer to build as per your thread #1, so we don't have to go to the other thread.
And there are quite some different circuit in different page in the other thread that is hard to follow.
Thank you.

Last edited by fastvideo; 22nd January 2010 at 01:38 PM.
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Old 22nd January 2010, 01:47 PM   #42
Salas is offline Salas  Greece
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The Hypno board follows those two reg schematics.
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Old 23rd January 2010, 08:36 PM   #43
le´flu is offline le´flu  Germany
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Hello Salas
is it somehow possible to turn the hypnotize into an regulator
for tubestage that needs +-85 Volts?

greetings ulf
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Old 23rd January 2010, 08:39 PM   #44
Salas is offline Salas  Greece
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Not practical I am afraid.
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Old 23rd January 2010, 11:47 PM   #45
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The hypnotize cannot be turned into HV regulator, but this one can do the job:
Simplistic Mosfet HV Shunt Regs

Last edited by Joshua_G; 23rd January 2010 at 11:49 PM.
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Old 26th January 2010, 03:50 PM   #46
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Quote:
Originally Posted by Salas View Post
Theoretically yes, but it will be very difficult to match the sides with the LED references and 0.3x resistors. I would use a Vbe controlled source for that. How much more is the 6A than the bias needed per side? You better be economic, so the dissipation is mainly kept at the load.
A Vbe controlled source in place of the resistors/led's/IRFP9240? Is matching the current drawn by each side necessary? Also, you recommended earlier that the regulator be set up for twice the current drawn by the load, but for an F5 is this still necessary for best sonics? Perhaps give it only an amp headroom above the F5's bias?

Thanks for sitting around in this thread answering our questions ;P
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Old 26th January 2010, 04:21 PM   #47
Salas is offline Salas  Greece
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The Vbe is steady 0.66V and helps in projecting the set resistor value. Then there is Vgs. If you match Vgs of CCS 240/9240 (unlikely, else you got many) then there will be no reason for the currents not to be matched also. But not necessary, especially when in Ampere count.

Twice I recommend in relatively low consumptions, so to have the MOSFETS working warm enough. Its a benefit, some members have found out too. When you have those MOSFETS at 1.5A vicinity and over, their Ygfs has picked up a lot though and I would not consider waste as a benefit anymore, especially at such power range heatwise.

Class A amps are the best shunt's customers as I have wrote before. Just because the juice is burning steadily on their sinks already. Set +20% on the shunts and it will keep their own sinks heat logical. Only don't test without the planned draw.
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Old 26th January 2010, 04:28 PM   #48
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by derwhalfisch View Post
you recommended earlier that the regulator be set up for twice the current drawn by the load, but for an F5 is this still necessary for best sonics? Perhaps give it only an amp headroom above the F5's bias?
the F5 is a push/pull ClassA amplifier.
At quiescent condition the two supply rails draw constant current, equal to the bias current plus the current to the front end.

At power output, when we are listening to music the supply rails draw variable current.
In the extreme when the F5 is sending 27W of ClassA power to the load, the supply rails are alternately drawing zero amps and twice the bias current.
If the amp goes into ClassAB because the load has demanded more than twice the bias current then the regulator that supplies that rail at that instant must supply this worst case current load.
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Old 26th January 2010, 04:35 PM   #49
Salas is offline Salas  Greece
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Best way to determine would be to monitor the current draw over 0.1R resistors in the shunt elements with the specific loudspeakers and listening habits.
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Old 26th January 2010, 04:49 PM   #50
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AndrewT and Salas;

Thanks for the clarification ;P I have so many different ideas and schems competing for attention in my head, as I try to determine where best to spend my dollars, I'm getting confused. Might stick with KISS principle in the mean time and just use loads of caps ;P
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