BPA300 Round 2 - Page 4

AndrewT · 31st January 2009, 04:31 PM

Virtually every solid state amplifier works better into a higher impedance load.

If you go for a 50W into 8r0 design and parallel them and bridge them you'll get 100W into 16. That's 56Vpk and 3.5Vpk into a resistive load.
A parallel pair will deliver 5Apk from each chipamp.
A parallel triple will deliver 3.3Apk from each chipamp.
The worst case transient current into a 16ohm load is around 10Apk.
Either version will work well.

warp_foo · 2nd February 2009, 04:46 AM

Quote:

Originally posted by rhysh
All information can be found in the wiki.

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

(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.

I replied in the original bpa300 thread before I found this one. Please mark me down for two stereo sets, $80. (Eight boards?)

Thank you,

Mike DuFresne

rhysh · 2nd February 2009, 02:34 PM

50 left.

alvane · 2nd February 2009, 06:53 PM

6 cards for me.

rhysh · 2nd February 2009, 09:21 PM

Quote:

Originally posted by alvane
6 cards for me.

wiki confirmed. also you got RE: mail

warp_foo · 3rd February 2009, 02:28 AM

Posted in the other thread by accident... oops.

Bump me up to 16 boards. (four stereo sets). I have updated wiki.

m

warp_foo · 3rd February 2009, 02:12 PM

Up to now I have been making the assumption that, of the two boards per channel, one is the BPA150, and the other is the power supply.

Is that assumption correct?

I just now have been looking through all of the BPA300 threads, and I don't think any of them have posted a photo of the PS board.

m

rhysh · 3rd February 2009, 02:14 PM

There are two boards per channel, both amplifier boards (identical).

. For a monoblock you need 2 boards. Stereo amp 4 boards.

juluska · 3rd February 2009, 09:11 PM

Is there any possibility to supply the pcbs with the smd components soldered? What about price?
Thanks

rhysh · 3rd February 2009, 09:14 PM

This is entirely possible. How many pcbs would you require? I will charge a flat rate of $5 for soldering resistors in total, excluding resistor cost.

31st January 2009, 04:31 PM	#31
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Virtually every solid state amplifier works better into a higher impedance load. If you go for a 50W into 8r0 design and parallel them and bridge them you'll get 100W into 16. That's 56Vpk and 3.5Vpk into a resistive load. A parallel pair will deliver 5Apk from each chipamp. A parallel triple will deliver 3.3Apk from each chipamp. The worst case transient current into a 16ohm load is around 10Apk. Either version will work well. __________________ regards Andrew T.

3rd February 2009, 02:12 PM	#37
warp_foo diyAudio Member Join Date: Oct 2008	2 boards/channel Up to now I have been making the assumption that, of the two boards per channel, one is the BPA150, and the other is the power supply. Is that assumption correct? I just now have been looking through all of the BPA300 threads, and I don't think any of them have posted a photo of the PS board. m

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2nd February 2009, 02:34 PM	#33
rhysh diyAudio Member Join Date: Sep 2008	50 left.

2nd February 2009, 06:53 PM	#34
alvane diyAudio Member Join Date: Jan 2009	6 cards for me.

3rd February 2009, 02:28 AM	#36
warp_foo diyAudio Member Join Date: Oct 2008	Posted in the other thread by accident... oops. Bump me up to 16 boards. (four stereo sets). I have updated wiki. m

3rd February 2009, 02:14 PM	#38
rhysh diyAudio Member Join Date: Sep 2008	There are two boards per channel, both amplifier boards (identical). . For a monoblock you need 2 boards. Stereo amp 4 boards.

3rd February 2009, 09:11 PM	#39
juluska diyAudio Member Join Date: May 2008	Is there any possibility to supply the pcbs with the smd components soldered? What about price? Thanks

3rd February 2009, 09:14 PM	#40
rhysh diyAudio Member Join Date: Sep 2008	This is entirely possible. How many pcbs would you require? I will charge a flat rate of $5 for soldering resistors in total, excluding resistor cost.

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