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-   -   BPA300 Round 2 (http://www.diyaudio.com/forums/group-buys/137430-bpa300-round-2-a.html)

rhysh 27th January 2009 04:35 PM

BPA300 Round 2
 
All information can be found in the wiki.

http://www.diyaudio.com/wiki/index.p...up+Buy+Round+2

http://www.shine7.com/audio/newPA150-4.jpg
(Original BPA board)

Boards will be $10 each. That is $20 for one monoblock (2 boards) and $40 for a stereo set (4 boards)

The same boards are used as the last group buy. BOM can be found in the wiki.

All BPA300 round one participents please refer to the WIKI.

Feel free to post your names down in the thread if you wish, but adding your name to the wiki is necessary.

rhysh 28th January 2009 08:16 PM

12 for myself..

tnargs 29th January 2009 11:52 AM

I haven't been able to view the shine7 site on my browser. Tried a few times this week. Is it just me?

Without seeing that site I can't see what the GB is actually supplying...

mikesnowdon 29th January 2009 12:20 PM

What is the measured power output of these things?

Do they only work from balanced input?

Whats the DRV for?

Sorry for the Q's but there are many many pages on the original thread.

Quite interested in these though.

Thanks,
Mike.

rhysh 29th January 2009 07:09 PM

Quote:

Originally posted by tnargs
I haven't been able to view the shine7 site on my browser. Tried a few times this week. Is it just me?

Without seeing that site I can't see what the GB is actually supplying...


The shine7 site works fine for me. It seems to be just you. The group buy is supplying the boards for the BPA300 amplifier, as pictured above. Maybe you should take a look at the original thread?

rhysh 29th January 2009 07:11 PM

Quote:

Originally posted by mikesnowdon
What is the measured power output of these things?

Do they only work from balanced input?

Whats the DRV for?

Sorry for the Q's but there are many many pages on the original thread.

Quite interested in these though.

Thanks,
Mike.


The power output is 300w @ 4ohms per monoblock.

They work in a balanced config, if you do not have a balanced source you will need,

The DRV - The DRV is to convert a single ended source into balanced output to drive the amplifier boards.

mikesnowdon 29th January 2009 07:14 PM

What if I wanted to use just a single board per channel?

What kind of power should I expect into an 8 ohm load and would I be OK without balanced input? If not is there any way to get these working off single ended?

rhysh 29th January 2009 07:18 PM

Quote:

Originally posted by mikesnowdon
What if I wanted to use just a single board per channel?
The amplifier is not really designed for this purpose, i have not actually reviewed this very much, but i would not reccomend it, especially into 8ohms.

Quote:

Originally posted by mikesnowdon
What kind of power should I expect into an 8 ohm load and would I be OK without balanced input? If not is there any way to get these working off single ended?
You are taking about 150w per channel into 8ohms. You are fine without balanced input, you just have to use the DRV134 opamp on the inputs or equivalent.

HaLo6 29th January 2009 07:18 PM

Since I am really noob ... (like I just started this hobby about 4 months ago, I am reading "The art of electronics" to "catch-up" with the lingo of the boards here...
Is it possible somone post a better schematic of what wires go where... I can get a 70% solution looking at the posted Jpegs, but I need like a 110% solution. This may be a little ambitious on my part to undertake a project with my small level of knowledge but i figure with everyones help I can get though it and you gotta get your feet wet somehow.

rhysh 29th January 2009 07:23 PM

It is really simple to wire up. The balanced input goes to the input + on each board. The speaker output is + on each boards, eg one speaker is connected between two + outputs.

+OUT --- SPEAKER --- +OUT

A bit confusing, but becuase of the balanced config this is how it works.


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