Post pics of your builds....

[Pageygeeza]

Avro:  Great work there!  Nice little Cmoy, Is there a virtual ground on it?  And you got any going spare?

 

[Pageygeeza]

Spacehead:  I went over your circuit and managed to get it onto a board 20x18 points, is that any good for ya?

 

[Avro_Arrow]

Thank You
 
Yes, the virtual ground is provided by the DIP version of TLE2426. The chip has been removed in the picture so I
could use the external dual voltage power supply. I built two versions...one with move common components and
one with Wima and Os-Con caps. I don't have any bare boards left, they have all been populated but I do have a
couple of finished amps left if you are interested. Here are a couple more pictures for you...
They are the pictures I used on E-Bay, thats why they have been written on.
 

 

 
Quote:

Avro:  Great work there!  Nice little Cmoy, Is there a virtual ground on it?  And you got any going spare?

 

[Spacehead]

It would be helpful. I need to optimize couple points from it. Maybe 18x16 fits. 
 
Quote:

Spacehead:  I went over your circuit and managed to get it onto a board 20x18 points, is that any good for ya?

 

[Pageygeeza]

Quote:

It would be helpful. I need to optimize couple points from it. Maybe 18x16 fits. 
 

 

That's a bit of a push.  But I'll see if I can shave some more off.
 

 

[Pageygeeza]

Avro:  I'd love to take you up on that offer, but unfortunately I'm extremely strapped for cash.  

 

[Avro_Arrow]

I know the feeling...
 
Quote:

Avro:  I'd love to take you up on that offer, but unfortunately I'm extremely strapped for cash.  

 

[Spacehead]

Thanks!
 
Here is the current ground channel setup:
 

Quote:

That's a bit of a push.  But I'll see if I can shave some more off.
 

 

[Pageygeeza]

Right, had another bash.  I'm trying to keep the whole thing as clean as possible and the only wires you should get from/to the board will be inputs/outputs and power.  Thing is I've managed to get the amplifying sections onto a 18/13 board but there is a problem with the power rails, I was playing around with the idea of using a second perfboard underneath the main one do deal with the power rails.  
 
Now onto the updates.  
 
I was just looking at the HA-5002 and it only has a single input and do you really need the 4 decoupling caps for it as well?
 
Quote:

Thanks!
 

 

[Spacehead]

 
Here is the current circuit if I remember right. 
 
Nice!
 
HA-5002 is single buffer, ground channel is in mono. The 100 uF decoupling caps can be omitted, they take a lot of space. It needs 0.1 uF - 1 uF SMD caps in its power pins. That makes it stable. 
 
I got an idea to use broken wall wart case for a headphone amplifier. But that 18/13 point build would be really cool. There isn't space for another perfboard under the main board, the case is about high as 25V/470 uF cap. But they could be run as bare wires and attached with hot glue? When will you release your contribution?! I am very interested. 
Quote:

Right, had another bash.  I'm trying to keep the whole thing as clean as possible and the only wires you should get from/to the board will be inputs/outputs and power.  Thing is I've managed to get the amplifying sections onto a 18/13 board but there is a problem with the power rails, I was playing around with the idea of using a second perfboard underneath the main one do deal with the power rails.  
 
Now onto the updates.  
 
I was just looking at the HA-5002 and it only has a single input and do you really need the 4 decoupling caps for it as well?
 

 

[Pageygeeza]

Spacehead:  The most recent circuit, is that the ground or the L/R Channel?  With all these changes It's hard to keep it within the alotted size.  
 
Oh another thing, resistors and caps, which will be surface mount and which will be through hole?  Plus, how good are you at SMT soldering, could you solder two to the same hole with a lead running through?  Might be able to shave a bit more off that way.
 
I do at times find it pretty hard to follow your diagrams sometimes.  If you're running them through a sim, could you please knock off the parts that are needed for the sim, might make it a bit easier for me to follw.  Cheers.  

 

[Spacehead]

I am pretty skilled in SMT soldering, I can do that. The recent circuit is L/R, one channel and then that is duplicated to another channel. All resistors are surface mount and most of the caps too. I don't have a capacitance meter so I just estimate proper sized cap. Resistors are soldered between points. C8 and C9, electrolytic and polyester, C1 polyester. I would like to check what kind of layout you have done so I could offer corrections. 
 
Quote:

Spacehead:  The most recent circuit, is that the ground or the L/R Channel?  With all these changes It's hard to keep it within the alotted size.  
 
Oh another thing, resistors and caps, which will be surface mount and which will be through hole?  Plus, how good are you at SMT soldering, could you solder two to the same hole with a lead running through?  Might be able to shave a bit more off that way.
 
I do at times find it pretty hard to follow your diagrams sometimes.  If you're running them through a sim, could you please knock off the parts that are needed for the sim, might make it a bit easier for me to follw.  Cheers.  

 

[Pageygeeza]

Not a problem mate.  So it's now a 6 chip design?  This is going to be a doozy even with the SMT's, I'll give it another bash tomorrow and I'll definitely post my workings then.  

 

[Spacehead]

It has 5 ICs
 
I have one dual op amp on L/R and one dual op amp on ground after TLE and then two stacked HA-5002. 
 
Quote:

Not a problem mate.  So it's now a 6 chip design?  This is going to be a doozy even with the SMT's, I'll give it another bash tomorrow and I'll definitely post my workings then.  

 

[Pageygeeza]

Ok, let's see if I have this right....
 
Both the L/R channels are going through the same IC and the ground is going through another IC then through the two HA-5002's?
 
Right, few questions about that just to clear up.  
 
1:  The LT-1028A is only a single channel design, so I'll need a 2 channel one so I can get the correct pinouts.
 
2:  Both the HA-5002 and BUF634 are obviously single inputs, in the latest diagram you're feeding back the output of the buffer to the input of the buffer.  If that is the case, it is ok to put the output back into the input?
 
3:  You seem to be posting a lot of conflicting stuff and it's starting to get very confusing.  I would imagine the amp sounds great, but the diagrams aren't making much sense to me as you keep changing things.  plus the fact you keep putting things in that aren't even in the amp, (leftover from the simulation you're using.)
 
4:  This could easily be a 4 IC design including the 2 stacked buffers.
 
Sorry, but you're not making my life any easier.