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Eddie Current DIY amplifier "Monolith"

post #1 of 172
Thread Starter 

Just saw this while browsing Eddie Current's website. Does anybody know anything about this? How long as it been out?

 

http://www.eddiecurrent.com/Used_Stuff.html

 

post #2 of 172

I'm curious to see a schematic, as always. 

post #3 of 172

One more curious soul! biggrin.gif

post #4 of 172

Rumors floating around the rumor mill make this sound very intriguing, particularly as a replacement for the dork-star. 


Edited by nikongod - 3/12/13 at 12:58pm
post #5 of 172

I was wondering the same thing. Just saw it. I've been to the EC website many times and never noticed it before...I assume it is relatively new?

post #6 of 172

I like how on the website it is marked "DIY", but the URL is "Used Stuff"...

post #7 of 172

Subscribed!

post #8 of 172

nikongod,

 

Where did you see the rumors you mentioned?

 

Best regards,

Adam

post #9 of 172
Quote:
Originally Posted by amcananey View Post

nikongod,

 

Where did you see the rumors you mentioned?

 

Best regards,

Adam

 

A different headphone site. 

There is not really much you can do with OPA541 (same chip as in the commercial joke) so the rumors seem to follow logic... 

 

The option of input transformers is incredibly cool upgrade, BTW. Ignoring the cost I would much rather have this, just for that. Considering the difference in cost, its no contest. 

post #10 of 172

By commercial joke, I assume you are referring to what you dubbed the "dork-star"?

 

Can you describe what input transformers do, and what their advantages are compared to coupling caps?

 

Best,

Adam

post #11 of 172
Quote:
Originally Posted by amcananey View Post

By commercial joke, I assume you are referring to what you dubbed the "dork-star"?

 

Can you describe what input transformers do, and what their advantages are compared to coupling caps?

 

Best,

Adam

 

Yes, that is the amp. Thousands of dollars for a gainclone in a fancy box with dodgy anodizing. 

 

Anyways, transformers are fricken awesome. They do all sorts of neat things. Some of them are similar to coupling caps, others totally pwn. 

So on the similar things: a transformer WILL block DC from the source from hitting the amp and blowing up your junk. This is kind of a 50/50 point, because the kinds of transformers you would use here are not designed specifically to do that, but in an unusual gear failure they should save your butt. 

 

Now, for what they do every day that is sooooooo cool. 

Transformers make it VERY easy to make your system ground loop proof. Coupling caps don't help you here. 

 

Transformers don't require a power supply. This is not an issue when you will be building them into something that already has a power supply for the active bits further down the chain, but you could easily build a little box to *just* convert SE to balanced (or the other way, or whatever) that sits on your desk all alone and will do its thing for 50 years or more with no intervention or complaints. 

 

Transformers convert single ended or balanced inputs to single ended or balanced outputs. There are opamp-looking chips that do this, but they require power supplies and don't do anything for ground loops or accidents like a transformer does. 

 

Transformers add (basically) no noise to the system. Even quiet op amps have more random noise than a nicely shielded transformer. 

 

And finally: Although it is quite subjective there are people who just prefer the sound of transformers to the sound of caps. 

 

Since this kind of diverged to include op amp based phase splitter chips:

The downside of the transformer compared to those op amp thingies is that the transformers are an order of magnitude more expensive - particularly when you will be putting them into something that already has a power supply. The little op amp thingies are also likely to measure better under ideal conditions, which makes the measurements first brigade very happy, but when you get into the real world what happens is anyone's guess. Considering that the difference between 0.1%THD and 0.0001%THD is inaudible but a ground loop is not, um, yea. 

post #12 of 172

Cool, I appreciate the explanation. Thanks!

post #13 of 172

Subscribed too....

post #14 of 172
+1 for input transformers. On my custom dsha1 they operate as voltage gain too, and I have a switch that can go 1:2 or 1:4. Something about noise free voltage gain is pretty special.
post #15 of 172

Anyone purchased already?
 

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