Simplistic Mosfet HV Shunt Regs - Page 27

ikoflexer · 1st April 2009, 11:58 AM

Bravo stixx, well done!

BTW, I would have thought the aikido is already a ripple remover, but now you got a regulator too. Your sound might improve with a single ended design? There are quite a few extra parts in the aikido that do nothing else but clean up dirty supplies. Now you got salas clean supply

Edit: in other news, the high powered salas shunt is still not working. It oscillated from the beginning like crazy. I will try once more with fresh parts and if it doesn't work, will call it quits for now.

John, for such a low parts project I would go point to point soldering.

Stixx · 1st April 2009, 12:05 PM

Hey Karsten,

thank you for your always kind words!
Making mistakes or screwing up just teaches you another lesson, and finally achieving something working and good sounding is very rewarding in this hobby...

Will keep you posted once I get to case the Aikido up and try the AE transformers.

best,
Oliver

Stixx · 1st April 2009, 12:13 PM

Thanks 'flexer for the kind words!

Quote:

BTW, I would have thought the aikido is already a ripple remover, but now you got a regulator too.

Yeah, it is said to have great PSRR but still needs a decent psu.
I have gone from a passive CRCRC over the quick Maida to the Salas shunt, and man can I tell you it is a difference!
The level of detail is absolutely fascinating...

Next amplifier will be an SE-spud with output transformers using pentodes like C3G, D3A or 7788. The shunt regulator was intended for this new project but I couldn't wait to try it out so I used my Aikido as test bed. You know the rest of the story...

Salas · 1st April 2009, 01:31 PM

Congratulations Stixx! Thanks for your invitation errr...for beer!

Ikoflexer: No way you will remain without an HV shunt for your particular power needs. Email me and we will try more on the fresh idea of the high powered one. You have many non standard parts, and you power a whole amp. There must be interactions. We will analyze the set up, and see what we will come up with.

ikoflexer · 1st April 2009, 01:44 PM

salas, I didn't mean to say I will give up for good. I usually take a little break to regroup my forces

Then attack again. At the moment I was playing with some ideas on getting it rock solid and stable, in simulation. Will mail you.

Oliver, interesting that you mention the spud amp; that's what the high current regulator I'm trying to build is for, a one tube spud amp using the 6LU8 tube. It sounds great already, even without a regulator, and is simple to build. My experience with the aikido comes from using the aikido idea in a tube buffer I'm using just before the lm3886 chipamp. I was playing with the aikido idea in simulation, and inserted a AC component in the supply. Adjusting the values of the aikido resistors (you will notice that after each stage there are two tubes doing the aikido supply cleaning bit) can get the AC component of the power supply to microvolt level, works like an embedded regulator. However, after discovering the salas regulator, I would rather do regulation outside the amp stages. Just my 2c.

Salas · 1st April 2009, 01:48 PM

Weirdly (?) it still responds subjectively for Stixx on different PSUs and regs. Wish that audio was more predictable...Naahh! Where would the fun be then?

ikoflexer · 1st April 2009, 02:04 PM

Quote:

Originally posted by Salas
Weirdly (?) it still responds subjectively for Stixx on different PSUs and regs.

Sorry, I don't understand what you're referring to.

Stixx · 1st April 2009, 02:12 PM

Quote:

quote: Originally posted by Salas Weirdly (?) it still responds subjectively for Stixx on different PSUs and regs. Sorry, I don't understand what you're referring to.

Guess he meant to say that my Aikido sounds different on different psu's...
Wouldn't call it weird though because even with good PSRR it won't filter out everything...

And the blacker the background (--> Pitchblack) the more detail you have...also very noticeable the improvement in soundstage...like 3D around my head.
Objectively

Stixx · 1st April 2009, 02:29 PM

pic for the ones interested...

Salas · 1st April 2009, 02:29 PM

Yes, I was referring to the Aikido and its inbuilt PSRR main theme. But its not only PSRR. The output impedance of the reg up high, the way it passes or gets excited by rectification byproducts, etc etc. The proof is in the pudding as they say. A system from wall plug to headphones or to speakers and room, does the Job? If yes, cool.

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1st April 2009, 11:58 AM	#261
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	Bravo stixx, well done! BTW, I would have thought the aikido is already a ripple remover, but now you got a regulator too. Your sound might improve with a single ended design? There are quite a few extra parts in the aikido that do nothing else but clean up dirty supplies. Now you got salas clean supply Edit: in other news, the high powered salas shunt is still not working. It oscillated from the beginning like crazy. I will try once more with fresh parts and if it doesn't work, will call it quits for now. John, for such a low parts project I would go point to point soldering.

1st April 2009, 12:05 PM	#262
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	Hey Karsten, thank you for your always kind words! Making mistakes or screwing up just teaches you another lesson, and finally achieving something working and good sounding is very rewarding in this hobby... Will keep you posted once I get to case the Aikido up and try the AE transformers. best, Oliver

1st April 2009, 01:31 PM	#264
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Congratulations Stixx! Thanks for your invitation errr...for beer! Ikoflexer: No way you will remain without an HV shunt for your particular power needs. Email me and we will try more on the fresh idea of the high powered one. You have many non standard parts, and you power a whole amp. There must be interactions. We will analyze the set up, and see what we will come up with.

1st April 2009, 01:44 PM	#265
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	salas, I didn't mean to say I will give up for good. I usually take a little break to regroup my forces Then attack again. At the moment I was playing with some ideas on getting it rock solid and stable, in simulation. Will mail you. Oliver, interesting that you mention the spud amp; that's what the high current regulator I'm trying to build is for, a one tube spud amp using the 6LU8 tube. It sounds great already, even without a regulator, and is simple to build. My experience with the aikido comes from using the aikido idea in a tube buffer I'm using just before the lm3886 chipamp. I was playing with the aikido idea in simulation, and inserted a AC component in the supply. Adjusting the values of the aikido resistors (you will notice that after each stage there are two tubes doing the aikido supply cleaning bit) can get the AC component of the power supply to microvolt level, works like an embedded regulator. However, after discovering the salas regulator, I would rather do regulation outside the amp stages. Just my 2c.

1st April 2009, 01:48 PM	#266
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Weirdly (?) it still responds subjectively for Stixx on different PSUs and regs. Wish that audio was more predictable...Naahh! Where would the fun be then?

1st April 2009, 02:29 PM	#270
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Yes, I was referring to the Aikido and its inbuilt PSRR main theme. But its not only PSRR. The output impedance of the reg up high, the way it passes or gets excited by rectification byproducts, etc etc. The proof is in the pudding as they say. A system from wall plug to headphones or to speakers and room, does the Job? If yes, cool.

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