BPA300 Round 2 - Page 5

rhysh · 3rd February 2009, 10:11 PM

I have got a deal for the price break we require, just need 20 more pcb's to be taken.

rhysh · 4th February 2009, 09:01 AM

Just to let everyone know, i will do ALL your SMD soldering for $5 (to cover the cost of solder and time), plus the price of the resistors.

Phat Daddy Mark · 4th February 2009, 01:31 PM

Hello Everybody,

Has anybody tried to use a BPA300 design for a PA system? The speakers would be 8 ohms but could be changed to 4 ohms since I haven't built them yet. I want an amp that has some power but enough headroom to reduce clipping. if there is a problem with the amp, being homemade they would be easier for me to fix (I would already have repair parts). Live PA work doesn't require high end sound quality but the equipment does need to be robust. Will this fit the bill? I'm thinking some sort of soft start, speaker protection, a stepped attenuator front end with hi Z and balanced inputs would be all that is needed, any comments? Oh ya, I know it would be cheaper to buy some Crown DC300's but this will be a lot more fun not to mention the bragging rights.

Thanks,

Mark

rhysh · 4th February 2009, 07:06 PM

Home audio and PA should never be crossed, unless for personal use due to health and safety risks. You dont want to be held responsible for a venue burning down becuase your amps dont have the required safety features. This has been discussed mant times on the forum but i will leave it up to you to decide.

In theroy, the amplifier will be fine for light PA use. Use overkill heatsinks and an oversized power supply.

TS Lo · 5th February 2009, 03:42 AM

Quote:

Originally posted by rhysh
I have got a deal for the price break we require, just need 20 more pcb's to be taken.

Hi Rhysh,

I like to join this GB for 4 boards.
Wiki updated.

Quote:

Originally posted by rhysh
Just to let everyone know, i will do ALL your SMD soldering for $5 (to cover the cost of solder and time), plus the price of the resistors.

Please advise total costs of the SMD resistors/capacitors
if I need your help to solder them on board.

Cheers

TS

rhysh · 5th February 2009, 08:07 AM

Hi, i will update the price for the resistors when i have looked into it a bit more. I am thinking about supplying kits, with the option of pre-soldered SMD resistors.

rhysh · 5th February 2009, 08:12 AM

Can i just ask how many people would be intrested in a kit? Price would be around $125 per monoblock, to populate a pair of PCB's.

chatziva · 5th February 2009, 09:10 AM

when you say kits, do you mean parts only? or parts & pcb's?

I would be definitely interested in parts only for 4 boards

regards
Evan

rhysh · 5th February 2009, 09:25 AM

Quote:

Originally posted by chatziva
when you say kits, do you mean parts only? or parts & pcb's?

I would be definitely interested in parts only for 4 boards

regards
Evan

Parts only, as this is a group buy anyway people will be supplied with boards to use with the kits

Not a problem as you allready have yours.

chatziva · 5th February 2009, 09:33 AM

great stuff, count me in for parts for 4 boards then

i was looking at farnell the other day and noticed that the susumu 0.1% resistors are quite good value. however that's true for small quantities, you might be able to strike a good deal on welwyn or vishay resistors depending on demand quantities

best regards
Evan

4th February 2009, 01:31 PM	#43
Phat Daddy Mark diyAudio Member Join Date: Aug 2007	Can These Be Used For A PA Amp? Hello Everybody, Has anybody tried to use a BPA300 design for a PA system? The speakers would be 8 ohms but could be changed to 4 ohms since I haven't built them yet. I want an amp that has some power but enough headroom to reduce clipping. if there is a problem with the amp, being homemade they would be easier for me to fix (I would already have repair parts). Live PA work doesn't require high end sound quality but the equipment does need to be robust. Will this fit the bill? I'm thinking some sort of soft start, speaker protection, a stepped attenuator front end with hi Z and balanced inputs would be all that is needed, any comments? Oh ya, I know it would be cheaper to buy some Crown DC300's but this will be a lot more fun not to mention the bragging rights. Thanks, Mark __________________ I have proof that God exists; he divinely inspired the invention of spell check just for me.

5th February 2009, 09:10 AM	#48
chatziva diyAudio Member Join Date: Jun 2007 Location: UK	when you say kits, do you mean parts only? or parts & pcb's? I would be definitely interested in parts only for 4 boards regards Evan __________________ "I don't remember fighting Godzilla, but that's probably what I would've done"

5th February 2009, 09:33 AM	#50
chatziva diyAudio Member Join Date: Jun 2007 Location: UK	great stuff, count me in for parts for 4 boards then i was looking at farnell the other day and noticed that the susumu 0.1% resistors are quite good value. however that's true for small quantities, you might be able to strike a good deal on welwyn or vishay resistors depending on demand quantities best regards Evan __________________ "I don't remember fighting Godzilla, but that's probably what I would've done"

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3rd February 2009, 10:11 PM	#41
rhysh diyAudio Member Join Date: Sep 2008	I have got a deal for the price break we require, just need 20 more pcb's to be taken.

4th February 2009, 09:01 AM	#42
rhysh diyAudio Member Join Date: Sep 2008	Just to let everyone know, i will do ALL your SMD soldering for $5 (to cover the cost of solder and time), plus the price of the resistors.

4th February 2009, 07:06 PM	#44
rhysh diyAudio Member Join Date: Sep 2008	Home audio and PA should never be crossed, unless for personal use due to health and safety risks. You dont want to be held responsible for a venue burning down becuase your amps dont have the required safety features. This has been discussed mant times on the forum but i will leave it up to you to decide. In theroy, the amplifier will be fine for light PA use. Use overkill heatsinks and an oversized power supply.

5th February 2009, 08:07 AM	#46
rhysh diyAudio Member Join Date: Sep 2008	Hi, i will update the price for the resistors when i have looked into it a bit more. I am thinking about supplying kits, with the option of pre-soldered SMD resistors.

5th February 2009, 08:12 AM	#47
rhysh diyAudio Member Join Date: Sep 2008	Can i just ask how many people would be intrested in a kit? Price would be around $125 per monoblock, to populate a pair of PCB's.

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