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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 28th July 2009, 05:15 AM   #831
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
So don't worry it surely works. And it works for long enough, must have been Dec 2008 or Jan 2009. The bass, the 3D, background silence, and liquidity gains are amazing, it really transformed. Like a turbo 300B. Use a big output cap, sounds better on an amp. I used 2200uF Pana FC. I don't know if it can disturb V2 though.
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Old 28th July 2009, 05:17 AM   #832
Tham is offline Tham  Malaysia
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Salas, do you mean a regular or modified v1?
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Old 28th July 2009, 05:19 AM   #833
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
The one on post #825.
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Old 28th July 2009, 05:22 AM   #834
Tham is offline Tham  Malaysia
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Thanks mate .
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Old 28th July 2009, 05:27 AM   #835
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Try V2, its the same, only better. Cascoded and buffered. I don't see any reason not to work and be even a bit more cleaner. If you encounter any practical problems, revert to the V1 I have shown. That has been tested on a T-Amp. (Its 2X6-8W really).
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Old 28th July 2009, 05:30 AM   #836
Tham is offline Tham  Malaysia
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will do
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Old 28th July 2009, 05:32 AM   #837
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Iko, will V2 accept a 2200uF output cap without problems? What does the sim say?

P.S. 1000uF C6 for sure. About 6V Zeners are much noisier than 12V ones or up to 4V7 ones. Worst are 8V2s. Maybe 3+3 2V Leds?
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Old 28th July 2009, 06:09 AM   #838
iko is offline iko  Canada
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The simplistic Salas low voltage shunt regulator
I got oscillation with a 2200uF on the output. I don't trust the simulator that much. Probably best to try some values in practice and see what's best. I've been thinking, and I'm not sure that for a power amp extended bandwidth on output impedance is something that one would want. Perhaps best would be a flat output impedance and phase in the audible frequency range?
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Old 28th July 2009, 09:36 AM   #839
Tham is offline Tham  Malaysia
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Iko, just to confirm if C6 is 100uF and NOT 1000uF as pointed out by Salas. Is R1 at 0.22ohm?
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Old 28th July 2009, 12:53 PM   #840
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The simplistic Salas low voltage shunt regulator
Quote:
Originally posted by Tham
Iko, just to confirm if C6 is 100uF and NOT 1000uF as pointed out by Salas. Is R1 at 0.22ohm?
C6 is 1000uF; you can omit that resistor. I use it just to measure the shunt mosfet current.

Edit: I'll post later a simplified schematic. One of the side effects of running so much current is that the output impedance is very low even without the cascode, so that the top transistor in the cascode can be taken out.
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