Diamante -a discrete medium power opamp

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#83
If there is any interest I was planning on making a small run of these boards. I got the go-ahead from Russ to do it, so let me know if you want some boards. Im probably going to use Olimex for this, but Im not sure about how much it would cost per board. It all depends how many I will have made. Personally Im in for maybe 8 boards.
 
#90
Russ White said:



MrMajestic,

Very good, I am glad to see the interest. if you would like I can send you Gerbers for a 2 side version which will eliminate the jumpers.

Just let me know if you would like them. 🙂

Best wishes to all who undertake the project.

Cheers!
Russ
Click to expand...

Thanks for your support Russ 🙂

I would love to have the double sided gerbers. Bring it on man 😉
 
#91
MrMajestic, if you are going to run a groupbuy you should first debug the pcb first. Don't order lot's of pcb's the first run. Make a few first, let a couple of beta builders build their pcb. Catch all bugs and correct the board. After that, order many pcb's as you'll ike.

Set up a wiki page first in order to get the interest. Normally the interest lís less than real orders. I know this :nod: I have experience from a couple of groupbuys now.

If you want some help setting up the wiki page I'll help you.

Some instructions here
 
#92
peranders said:
MrMajestic, if you are going to run a groupbuy you should first debug the pcb first. Don't order lot's of pcb's the first run. Make a few first, let a couple of beta builders build their pcb. Catch all bugs and correct the board. After that, order many pcb's as you'll ike.

Set up a wiki page first in order to get the interest. Normally the interest lís less than real orders. I know this :nod: I have experience from a couple of groupbuys now.

If you want some help setting up the wiki page I'll help you.

Some instructions here
Click to expand...

Im going out on a limb and assume that Russ debugged it already 😉 But I am planning to order a few for myself at least to check them out. Not sure how much I can change on the board myself since I just have the gerbers and basically no knowledge of how to make advanced boards. Thanks for the group buy instructions, good information there.
 
#94
MrMajestic said:


Im going out on a limb and assume that Russ debugged it already 😉 But I am planning to order a few for myself at least to check them out. Not sure how much I can change on the board myself since I just have the gerbers and basically no knowledge of how to make advanced boards. Thanks for the group buy instructions, good information there.
Click to expand...

Hi MrMajestic,

The circuit and the single side boards are well tested, and the two side boards will be essentially the same board with traces instead if jumpers. There should not be much risk assuming the manufacturer does not make any mistakes.

Cheers!
Russ
 
#97
A few things:

  1. Avoid to have silkscreen patterns at the pads. You may end up with pads with paint on and no tin under. My pcb manufacturer removes silkscreen on pads but not everyone do it.
  2. Have pcb name and revision in all layers but you can place they outside the board
  3. Have pcb layer name in every layer and also those you can place outside, i.e soldermask, component layer or complay etc.
  4. I would change all plain resistors to 400 mil or 10 mm between the pads
    [/list=1]

    Where do you have the latest schematic? I can only find the revision 1.1.

    Why do you run the output stage in so little class A? 5 ohms in the driver and 10 ohms (for each transistor)

    You can make the board a lot smaller if you reduce the tracks a bit. In most places 20-30 mils is sufficient. I like groundplanes also :nod:
 
#98
Peranders,

The PCB is meant to be simple. I can certainly make it better, but it is quite good enough as it is.

The time I can devote to it is small. 🙂

I will at some point sell a better version of the cct.

The part values are open to change. This is a hobbyist's board meant to be tweaked and adjusted.

Just about any PCB manufacturer will clip the silk around the pads. MrMajestic, make sure you ask them to do this if you want it. Even if the silk were not clipped, all the components can be soldered from the bottom where there is no silk.

I have probably spent as much effort on it as I can at the moment. Use or not I don't really mind.

Cheers!
Russ
 
#100
peranders said:

Sorry, I thought the goal was "spiztenklasse", top class in most respects. It's a good start though. :nod:
Click to expand...

Thanks,

A more "spiztenklasse" layout will come. 🙂 Still I don't think anyone who builds it will be disappointed.

I have actually changed the cct since this design. or rather created a new circuit based on it.

I am just tremendously busy building/testing DACs and such. 🙂

Cheers!
Russ
 
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