The simplistic Salas low voltage shunt regulator - Page 109

iko · 19th September 2009, 10:53 PM

Quote:

Originally Posted by RCruz

Maybe I should also try MPSA18 .... I have some...

Ricardo

Ricardo, you should definitely give it a try. But with those miles of shunt output cables you got there... I'm not sure it can make a difference

(just kidding)

Melon Head · 19th September 2009, 10:55 PM

Are there pcbs available for these yet?
If so I will try all of these with the equipment I have access to.

iko · 19th September 2009, 11:05 PM

There's the pcb part of the buffer GB, which includes some variation of v1, but I haven't checked the schematic out, salas, maybe you can say something about it.

I'm working on a pcb for v1.5 and v2, have been prototyping heavily for the last two weeks. It's still under construction though. Got some nice results so far. However, these circuits are not very difficult to build, even point to point.

Salas · 19th September 2009, 11:21 PM

James did pcb work page 23 post 226

Also Disco did pcb work on 10X16cm Eurocard.

Salas · 19th September 2009, 11:33 PM

Quote:

Originally Posted by ikoflexer

There's the pcb part of the buffer GB, which includes some variation of v1, but I haven't checked the schematic out, salas, maybe you can say something about it.

Its led referenced 10V symmetrics with 100uF output caps set at 70mA CCS for the DC B1. at such voltages leds are lending themselves bcs you can reach with just 5. Guys who have AC coupled original B1, made DC with 317 & 337 and then that. They had a large benefit as they said. Still B1 is a CCSed line level follower and is supposed to be more immune than an SE resistor loaded phono for instance. The output caps I chose are for good termination given the vrefs, CCS settings, etc. Taking into account typical layout ''sins''. So to get good step response as JWB once measured an excellent result. Kinda optimized you could say.

Someone can take part in the GB, get one, cut along the red line. Can mount the IRFPs under PCB to a thick enough metal floor. No sinks for 200-300mA per side. Just a silicone insulation pad.

If for higher Vout, can get creative with all those led pads for Vref. Good zeners, resistors, since there is already an inline ccs, whatever.

Melon Head · 11:43 PM

I was meant to meet up with James but we live at opposite ends of the city, so it never eventuated.
Maybe I will pay him to make me some. My time is very limited at the moment.

Stuff it. I will do it point to point using James layout.

Melon Head · 19th September 2009, 11:59 PM

could you send me the schematic for that version (I assume it is version 1, but not sure)

Salas · 20th September 2009, 12:02 AM

http://www.diyaudio.com/forums/showp...9&postcount=11

http://www.diyaudio.com/forums/showp...1&postcount=12

maxpou · 20th September 2009, 02:38 PM

Hi Guys,
this is my negative and positive Salas shunt regulator but the only difference i use irfp150 and irfp9140 for mosfets. i will test as soon as possible in preamp line stage. Some picture. Thanks Maxpou

Salas · 20th September 2009, 04:33 PM

Very decent work. Bravo. Waiting for your subjective comments. You may up the zener shunting capacitor to 1000uF although your zeners look as good types.

What about contributing the pcb? Looks practical.

19th September 2009, 11:40 PM	#1086
Melon Head Banned Join Date: Nov 2006	I was meant to meet up with James but we live at opposite ends of the city, so it never eventuated. Maybe I will pay him to make me some. My time is very limited at the moment. Stuff it. I will do it point to point using James layout. Last edited by Melon Head; 19th September 2009 at 11:43 PM.

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19th September 2009, 10:55 PM	#1082
Melon Head Banned Join Date: Nov 2006	Are there pcbs available for these yet? If so I will try all of these with the equipment I have access to.

19th September 2009, 11:05 PM	#1083
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	There's the pcb part of the buffer GB, which includes some variation of v1, but I haven't checked the schematic out, salas, maybe you can say something about it. I'm working on a pcb for v1.5 and v2, have been prototyping heavily for the last two weeks. It's still under construction though. Got some nice results so far. However, these circuits are not very difficult to build, even point to point.

19th September 2009, 11:59 PM	#1087
Melon Head Banned Join Date: Nov 2006	could you send me the schematic for that version (I assume it is version 1, but not sure)

20th September 2009, 04:33 PM	#1090
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Very decent work. Bravo. Waiting for your subjective comments. You may up the zener shunting capacitor to 1000uF although your zeners look as good types. What about contributing the pcb? Looks practical.