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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone) - Page 6

post #76 of 1168
Quote:
Originally Posted by sunneebear View Post

Finally got some time to put the pair of amps together.  Only a mock-up to set the layout for the case.  I am running it with a pair of LM4562 in class A (Purrin).  This thing sounds sweet.  Balance and SE.  All I have to do now is disassemble it and put the finally touches on the case and maybe some cosmetic work.  Thing is, it sounds so good I can't stop listening.  Next weekend I guess.


That is freaking-licious-awesome!!!  What DAC are you using?


Edited by purrin - 9/18/10 at 9:39pm
post #77 of 1168

Quote:
Originally Posted by dlaloum View Post

Very cool - where does one look up how to make a balanced amp?

You will need a balanced DAC. Get two amp boards. Feed DAC outputs L+ and L- into L and R channels on amp #1. Feed DAC outputs R+ and R- on L and R channels of amp #2. Instead of L, R, Ground on headphones, you wire L and R channel of amp #1 into Left headphone driver, and L and R channel of amp #2 into Right headphone driver.  You just leave ground unused.
 
post #78 of 1168
Thread Starter 
Quote:
Originally Posted by sunneebear View Post

Finally got some time to put the pair of amps together.  Only a mock-up to set the layout for the case.  I am running it with a pair of LM4562 in class A (Purrin).  This thing sounds sweet.  Balance and SE.  All I have to do now is disassemble it and put the finally touches on the case and maybe some cosmetic work.  Thing is, it sounds so good I can't stop listening.  Next weekend I guess.


Beat me too it! :) Looking forward to some pictures!

post #79 of 1168
Quote:
Originally Posted by purrin View Post




That is freaking-licious-awesome!!!  What DAC are you using?


Matrix Mini-i.

 

I have a set of Burson opamps that is currently split up in halves and used in other DIY projects.  Guess I will be soldering it back together while I enjoy the music.

post #80 of 1168
Quote:
Originally Posted by francisdemarte View Post




Beat me too it! " class="bbcode_smiley" height="" src="http://files.head-fi.org/images/smilies//smily_headphones1.gif" title=":)" width="" /> Looking forward to some pictures!


Balance Cube HPA.jpg

post #81 of 1168
Thread Starter 

Awesome build! What are you using for the volume control?

post #82 of 1168

The original pots driven in sequence by a geared counter shaft.

 

Pot.jpg

post #83 of 1168

Just put the old Burson opamps back together and plugged them in.  Headroom, detail, extension and all ooohh sooo smooothhh.

post #84 of 1168
Quote:
Originally Posted by sunneebear View Post

Just put the old Burson opamps back together and plugged them in.  Headroom, detail, extension and all ooohh sooo smooothhh.


What ic opamp were u using?

post #85 of 1168

LM4562 in class A as suggested by purrin.

post #86 of 1168
Thread Starter 
Quote:
Originally Posted by sunneebear View Post

The original pots driven in sequence by a geared counter shaft.

 

Pot.jpg


That's a ingenious solution and a great alternative to a pricey 4 gang pot. Did you make that or did you buy it where?

post #87 of 1168
Quote:
Originally Posted by sunneebear View Post

The original pots driven in sequence by a geared counter shaft.

 

Pot.jpg

 

/emote worship

 

You are a mastermind!
 

post #88 of 1168

Thanks for the kind praise guys but I'm pretty sure I'm not the first to do this.   The idea came to me out of necessity.  When I first started DIYing, I could only afford used or surplus parts.  I found two mono Noble pots for dirt cheap and came up with this idea to use them.

post #89 of 1168

Necessity is the mother of invention

 

The pots are brilliant!

post #90 of 1168

Finally put the finishing touches on my balance Lovely Cube.  It's a cheap case but hey it works.

 

Face.jpg

 

The completed layout.  Sorry for the blurry phone pictures.

 

completed amp.jpg

 

I am running it with the Burson dual op amps.  I also put larger heat sinks in the two transistors in front of the two large capacitors because they get pretty hot.  Is this normal for this amp?  Even with the large heat sinks the case gets pretty hot when I put the cover on.  I will be putting holes or a grill of some sort on the cover when I get a chance.  I am pretty sure that the amount of heat generated is acceptable but I don't like hot amps so I will try to remedy this issue.

 

Burson op amp & heat sinks.jpg

 

Anyone with this amp or the M-Stage think it runs kind of hot?

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