BPA300 Round 2

[AndrewT]

what's the output impedance of the DRV? Maybe this could be the buffer to drive the balanced line.
Or use a pair of B1s as balanced line drivers.
Don't add any more gain to the BPA.

 

[rhysh]

Group Buy Will Be Open Until Midnight Monday 16th Febuary 2009 GMT.

 

[juluska]

well, so i understand no more gain is needed, a simple pot is enough, like other lm3886 designs. About the chassis, i think the distance between the toroidal and pcbs is greater in my layout design than the original shine7 design. I think it's worth to try an integrated amplifier design.

 

[rhysh]

You could allways give it a try, see what it sounds like before you cut the panels.

 

[rhysh]

Target: 80 Boards.

Current: 60 Boards

Come on people!

 

[viki_v2]

bpa 300

hey guys can any body help me in outsourcing bpa 300 kits in india i am desperate to get them

 

[rhysh]

Do you need any PCB for the BPA300?

 

[tryonziess]

Rhysh,
If you are ready to start shipping for round two I will send payment by paypal this evening. Let me know.
53.00 for 4 boards plus shipping to the U.S. correct?
Tad And thanks

 

[rhysh]

Rhysh,
If you are ready to start shipping for round two I will send payment by paypal this evening. Let me know.
53.00 for 4 boards plus shipping to the U.S. correct?
Tad And thanks

Hi there, i would prefer to finish the group buy before i start collecting payments. I will double check your total and update it to the wiki.

R

 

[chatziva]

happy to hear everybody is getting their boards

means that Rhys can get some time to organise a gb for BPA300 parts .... sorry i am being cheeky now

any strong interest in BPA300 parts so far?

best regards
Evan

post edit: oops should have posted that in the round 1 thread... never mind

 

[rhysh]

happy to hear everybody is getting their boards

means that Rhys can get some time to organise a gb for BPA300 parts .... sorry i am being cheeky now

any strong interest in BPA300 parts so far?

best regards
Evan

I have not ordered the boards for the second round yet Not even started requesting payment! I just managed to fit you in with some spare boards from last round.

Anyway back on topic, Who would be intrested in a full set of parts to go with your BPA300 boards? The price will be the same if not cheaper then ordering direct!

 

[HaLo6]

I am.

 

[mikesnowdon]

Please. Would be easier to get all the bits in one bag.

Will there be options like 'standard' and 'premium' on the parts?

 

[rhysh]

Please. Would be easier to get all the bits in one bag.

Will there be options like 'standard' and 'premium' on the parts?

Well, the part count for the BPA300 is pretty low. I will probably just use a standard 'premium' BOM for the kit. There only premium parts you can really use are;

C9 - C14
C1
C4

When i say premium, i just mean nichicon muse ES electro caps and a reasonably priced C1 film cap.

The parts will be somewhat premium, but the price wont.

 

[rhysh]

I have added a kit intrest column to the group buy wiki table. Please select either yes or no for kit intrest.

 

[juluska]

lm3886tf

Is there any problem to use LM3886TF instead of LM3886T?

 

[rhysh]

I would reccomend using the TF version anyway. The T version is not isolated. It will be fine.

 

[rhysh]

Quite a few people have PM'd me asking me about my BPA300 build.

Well, here goes.

Traffo's: 2 X Avel lindberg 500VA 25V
Capacitors: 2 X 68,000uf 50v per monoblock
Enclosure: 2 X hifi2000 3u 300mm enclosures with heatsinks. 10mm panel (www.modushop.biz)
Balanced Inputs with no inbuilt line driver

Then the standard build on the boards.

 

[juluska]

can you post photos?
thanks

 

[rhysh]

can you post photos?
thanks

Once its done! I dont actually own a BPA300 at the moment.