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Old 11th May 2004, 01:38 AM   #241
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Here is the top of the populated board.
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Old 11th May 2004, 01:39 AM   #242
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And finally, here's the bottom of the populated board (more to show off how crappy I solder things together...).
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Old 11th May 2004, 01:41 AM   #243
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by CrisTUFR
Here you go! I optimized the images for quick downloading, and hence they're only 320x240 for the forum right now. They give the general idea of the quality of the build, which is generally not all that bad.

Now if only I could figure out how to make them red...
Board looks good!

As for the red, I am thinking about making the LM4780 boards black. Do you think that red is better than black? A different color (yellow maybe) could be used for the silkscreen.

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Old 11th May 2004, 01:49 AM   #244
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Quote:
As for the red, I am thinking about making the LM4780 boards black. Do you think that red is better than black? A different color (yellow maybe) could be used for the silkscreen.
I don't know Brian, I hear that "Black is the new Red"!

I figure that you're probably better off with black, just to distinguish them from the 3875 boards... But that's just my worthless opinion!

Now I have to figure out how to put these bad-boys into a nice enclosure, and move on to doing some funky stuff with some TangBand 871's to complete my entire PC audio setup!!!

Cheers,

Chris
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Old 11th May 2004, 02:58 AM   #245
BrianGT is offline BrianGT  United States
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Well, with a prototype made with the board layout, I am considering organizing the order based on the current layout.

As for pricing, it looks like 1 pcb set would cost $20, and include:
- 2 power supply boards
- 2 amplifier boards
- 1 bridging board (DRV134)

This price would be for 4 oz copper (for the extra current handling), and the boards would be put together with scoring, as with my current LM4780 boards. (boards to either be red or black)

The amplifier pcb would be a single LM4780 chip hardwired in paralled configuration.

One pcb set would allow for these configurations:
- 2 channel amplifier (one amplifier pcb per channel) with a single or dual power supplies. (dual monoblock setup possible with one pcb set)
- bridged setup producing 150-200w for one channel

Remember that the LM4780 is hardwired in parallel mode, so one chip = 1 channel.

The non-bridged board should put out around 50-100w, depending on the power supply voltages and the load driven.

Kits will also be offered, and pricing will be announced soon. Pricing should be just a bit more than the current LM3875 group order.

I modified the Wiki for a new list to see the interest out there. If the interest is fairly substantial (100+ pcbs being the target to get the price), I will go through with the order, and offer kits. Please sign-up again here:
http://www.diyaudio.com/wiki/index.p...CB+Group+Order

Please indicate your initial interest. This will allow for me to determine the kit pricing, and the whether there is enough interest for me to put time into this.

Drop me an e-mail if you have any questions. PCB set pictures will be posted soon.

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Brian
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Old 11th May 2004, 03:22 AM   #246
BrianGT is offline BrianGT  United States
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For the group order that I am organizing, please follow through in the new thread that I created for it:
Group order of non-inverted LM4780 pc boards? Anyone interested?

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Old 11th May 2004, 09:17 PM   #247
KT is offline KT  United States
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Default Terrific thread

This discussion has been most educational for me. Great work, you guys. Thank you.

Being a hobbyist-level constructor, I was fascinated by the discussion as you balanced all the operating requirements against each other. I found the grounding discussions particularly interesting - never knew there was so much to it!

Anyhow, I can see that there is definitely a logic to it, but also a good deal of intuition and aesthetic judgement. Designing truly is an art form, and Peter and Brian sure are great artists.

The boards look fantastic!

I hope more discussions like this can take place on the forum, here. Although I can only grasp much of the banter at a very elementary and conceptual level, I did learn a lot.

Great job!
KT
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Old 24th August 2004, 05:57 PM   #248
rs1026 is offline rs1026  India
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Default confused... BrianGT and Peter's board

This thread no doubt came to a logical conclusion but i got confused.This is wrt to final pcb.zip posted by BrianGt. I saw the layout and tried to compare it with some scehmatics in the data sheet and was surprised to find that it doesnt match with any version of the amp.
Can some one please give more details.I also observed that there 9 resistors and two caps. It would be very nice if someone could post a schematic. I am a newbie and I prefer looking at schematics before starting with the board. Bill of material along with schematics will also help. I am sure most of you guys would have already incorporated this design.Also how this amp sounds will really motivate me in finishing the proj this weekend itself
Thanks.
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Old 27th August 2004, 09:21 PM   #249
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Default Dead or alive?

Any Progress on these or is the project/group buy dead?
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Old 28th August 2004, 08:17 PM   #250
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Default Brian: What is status?

Brian what is the status of 4780 PCB project?

I know you have been very busy, but is the project dead or not?

Thanks,

Sheldon
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