[Ferrari]

Thanks for the kind words gents!
Here is a shot of the underside. I’m clearly not good as some experienced perf-boarders here (Fitz, Seaside…) but I’m quite happy with the results. (The in/outputs are going through teflon cable from/to the connectors at the front side).
I was sitting back with a pencil and paper to make a raw sketch in less than an hour, but it takes almost 8 hours hard work to solder the thing together. Followed by an half hour testing… the job was done and the amp working.
 
 

 
 
 
… and the little perf-board amp in action.

 

 

[balderon]

Very nice work Ferrari!

 

[Pageygeeza]

That's really clean Ferrari!  Looks almost bomb proof.  

 

[Spacehead]

And I again feel sick because my builds are so ugly. THIS IS A beauty contest isn't it?

 

[cobaltmute]

Ferrari - Excellent work.
 
Do you think you could do a post or a thread about how you go about getting the work so clean?  Like how you go from the schematic to such a clean layout?
 
I really appreciate clean work like this, but I can never quite manage it so I give up and always design myself a PCB.

 

[Pageygeeza]

Quote:

Ferrari - Excellent work.
 
Do you think you could do a post or a thread about how you go about getting the work so clean?  Like how you go from the schematic to such a clean layout?
 
I really appreciate clean work like this, but I can never quite manage it so I give up and always design myself a PCB.

 
I'm pretty sure the way he does it is sketch up on paper roughly where the components go and basically draw up all connections.  Saves putting it together to find it doesn't work/look too good and redo it.  Just keep optimising it on paper, then when you're happy build it.  I actually use that method and it works flawlessly.
 

 

[cobaltmute]

I was hoping to find out any secrets. 

 
The layout I get.  It's how to do you solder and run the wires on the bottom so cleanly.  Never been able to get a board that neat.

 

[Ferrari]

What Pageygeeza said is indeed roughly what I have done. Actually there is no secret in doing perf-board.
I will try to write down what (how) I have done (it).
 
Layout:
The power supply is quite simple, but the amp part is more complicated and requires some more attention. With a pencil, I started to sketch one channel of the amp up on paper, all components and the associated connections while keep the signal path as short-and-logic as possible.
Important here is understanding the components and circuits properly and how they are connected.
Then copy this optimized channel of the amp to the other 2 channels (3-channel amp in my case).
 
Stuffing parst:
Start with stuffing all the part on the perf-board, as you sketched but don’t solder them completely yet.
The resistors can be semi-fixed on the perf-board by bending the resistor leads. Other components like transistors, IC-sockets, trimpots… can be semi-fixed on the perf-board by soldering only 1 pin of the component (easier to change or replace). Double-check the (number of the) parts against the schematics.

Soldering:
Try to work structurally, first the power supply traces since you will need them, no matter how many channels the amp has. Then the amp part, try to complete 1 channel first. Check and re-check everything to be sure that all components are correctly mounted and soldered. When this is done, simply copy it to the other channels of the amp.
 
I’m not sure if this is a success formula for everyone, but it is in short how I did it.
 

 

[cobaltmute]

Thanks.  I'll keep that in mind my next attempt.

 

[Voodoochile]

 
So Ferrari- you and Sijosae were separated at birth, right? That is beautiful board work! I don't think I could ever manage that with my fingers.
 
This is a weak follower, but I finished this amp a couple weeks ago, but am just now getting to some pictures. It's a derivation of the mapletree design, with somewhat different operating points and a very different power supply.


And another shot of it burning away:

 

[JSTpt1022]

A question for Ferrari.
 
What are you using to make your traces on the underside of the board. Many of the connections seem too long and or too perfect to simply be device leads.

 

[cobaltmute]

A work in progress:
 

 
Single channel of a an original Kumisa III.

 

[Avro_Arrow]

I have some suggestions...
You have some imbalances in there.
For the L/R channels, R1 should be 15K to match R3.
R2 should be 50K or 10X your volume pot (if you are using one...).
For the ground channel, R1 and R2 should be the same value.
 
Hope this helps...
 
Quote:

Quote:

Originally Posted by Pageygeeza /img/forum/go_quote.gif Though I would love to see the schematics for it so I could see how it could be better arranged, I have a few prototyping ideas that might be beneficial to your project.

I am interested

Left and right:

ground channel:

 

[Ferrari]

Quote:

A question for Ferrari.
 
What are you using to make your traces on the underside of the board. Many of the connections seem too long and or too perfect to simply be device leads.

The short traces are made from resistors leads, while the long (power and ground) traces are 0.4mm or 1mm solid copper leads, depends on location.
 
 

 

 

[Avro_Arrow]

Here are some of my "works in progress" and builds...
 
The first one is a dual voltage power supply.
 

 
The next is a CMoy I design and built last year...it is being run from +/- 15 volt supply right now...
It usually runs on one or two 9 volt batteries. Op Amp is a OPA2132.
 

 
The next one here is a Bravo Hybrid amp...it has several mods on it and is waiting for upgraded electrolytic caps.
 

 
And lastly is a 1793 DAC that is going under the knife today to replace the badly designed virtual ground with a tle2426.
The kit was sourced from a Chinese DIY website