I understand that in fact I worked in the international banking sector. I just wanted to point out that those are not prices one should expect to be able to hold him to.
Nordic,
I haven't been able to find mauro's own website. I googled Mauro etc. and only find schematics/files up to Rev C. What is the weblink?
Thanks in advance
earsandeyes
I haven't been able to find mauro's own website. I googled Mauro etc. and only find schematics/files up to Rev C. What is the weblink?
Thanks in advance
earsandeyes
Lol it was linked in post 2571 http://translate.google.com/transla...fe=off&ie=UTF-8&oe=UTF-8&prev=/language_tools
Thanks for that info Audie - it was only out of interest; I'll probably stick to the Rev C. I looked at the site but couldn't find it.
I'd already thought about getting one 300VA and building the case such that the other could be added!
As I say, 'er indoors doesn't understand why I keep looking for better sound. Hopefully I can repeat the experiences of some of the members here and the Rev C will be so obviously better that she'll understand...
Cheers
Stuey
I'd already thought about getting one 300VA and building the case such that the other could be added!
As I say, 'er indoors doesn't understand why I keep looking for better sound. Hopefully I can repeat the experiences of some of the members here and the Rev C will be so obviously better that she'll understand...
Cheers
Stuey
Stuey,
May not be good to have high hopes of that happening, unless 'er is one of the rare minority.
My better half does not understand my interest, but accepts it and in a way supports it. She is not interested enough in sound reproduction to care if she is hearing it through a TV, transistor radio or my Hi Fi.
Cheers,
Audie.
May not be good to have high hopes of that happening, unless 'er is one of the rare minority.
My better half does not understand my interest, but accepts it and in a way supports it. She is not interested enough in sound reproduction to care if she is hearing it through a TV, transistor radio or my Hi Fi.
Cheers,
Audie.
A new Twist on these ideas Mauro has suggested....
Today I have built a new amplifier based on the current pump (bridge) idea that Mauro has shown us.
This is a new design as far as I know, I have never seen anything like it except My_Ref which has the current pump in common.
The compensation of the circuit is much more like Rev A, but because of the speed of the THS4131 it is actually quite linear and phase coherence should be very good.
Anyway, it looks a bit like this, this is a partial schematic, but you should get the idea.
All of the pieces are modular, making it easy to build an amp of significant power capability. The way I have it should be capable of ~200W.
I am withholding the details for now, but if there is interest I will show them.
The amp is based on my "Twisted X Driver" front end and is fully symmetric. The current pumps operate in a bridged configuration and you can parallel as many of them as you like(within reason) My prototype has four pumps per channel, so there are 8 devices for the stereo pair.
I am still testing, but early results are very promising indeed. I have zero offset at the outputs, and offset from each device to GND is low enough not to worry me. I could easily add a servo to take care of it if I like.
I have at least temporarily named this amp "Monkey Puzzle" after the Tree. 😀
Cheers!
Russ
Today I have built a new amplifier based on the current pump (bridge) idea that Mauro has shown us.
This is a new design as far as I know, I have never seen anything like it except My_Ref which has the current pump in common.
The compensation of the circuit is much more like Rev A, but because of the speed of the THS4131 it is actually quite linear and phase coherence should be very good.
Anyway, it looks a bit like this, this is a partial schematic, but you should get the idea.
All of the pieces are modular, making it easy to build an amp of significant power capability. The way I have it should be capable of ~200W.
I am withholding the details for now, but if there is interest I will show them.
The amp is based on my "Twisted X Driver" front end and is fully symmetric. The current pumps operate in a bridged configuration and you can parallel as many of them as you like(within reason) My prototype has four pumps per channel, so there are 8 devices for the stereo pair.
I am still testing, but early results are very promising indeed. I have zero offset at the outputs, and offset from each device to GND is low enough not to worry me. I could easily add a servo to take care of it if I like.
I have at least temporarily named this amp "Monkey Puzzle" after the Tree. 😀
Cheers!
Russ
Attachments
The THS4131 is fully symmetrical(super if you will), TI licensed the IP from Nelson Pass.
We gain effect of symmetry by placing the current pump in each of the loops. The performance of the entire circuit is dominated by the driver. This is the same principle Nelson himself used in the "GC SuperSymmetry" thread. The only difference is I utilize a fully differential opamp in place of a differential pair of discrete transistors. 🙂
Cheers!
Russ
We gain effect of symmetry by placing the current pump in each of the loops. The performance of the entire circuit is dominated by the driver. This is the same principle Nelson himself used in the "GC SuperSymmetry" thread. The only difference is I utilize a fully differential opamp in place of a differential pair of discrete transistors. 🙂
Cheers!
Russ
I'll have one of the "low power apps" for my mids & tweets, and one of the "one I like best" for my subs, if you please.
Don't forget to go cut the grass....Make plans for the loading dock.... ahem, Let me see the other side of the logo. I think that's where the perfect pear is.😎
Don't forget to go cut the grass....Make plans for the loading dock.... ahem, Let me see the other side of the logo. I think that's where the perfect pear is.😎
Waiting eagerly.
I have an Evolution board, just waiting for a chance to build it.
This also looks very interesting. Any idea availability timeframe for the boards?
Been wanting an amp to use a balanced output linestage with.
George
I have an Evolution board, just waiting for a chance to build it.
This also looks very interesting. Any idea availability timeframe for the boards?
Been wanting an amp to use a balanced output linestage with.
George
Lol You can call the low power one the worm... you can only go through so many pears until you strike a worm... and I guess the same can be said for monkeys...
May I ask as some background, what exactly the current pump does.. please don't say it pumps current...
May I ask as some background, what exactly the current pump does.. please don't say it pumps current...