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Old 17th February 2012, 10:18 AM   #671
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As a matter of interest, how many of us are using some form of regulator for any of the BA-2, BA-3 front ends?
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Old 17th February 2012, 04:56 PM   #672
Botte is offline Botte  United States
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I'm using a shunt reg on my BA-3FE +-29 volts
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Old 18th February 2012, 12:03 AM   #673
eyoung is offline eyoung  United States
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Who is keeping up on the F5 turbo thread (diodes across resistor debate)same result ...more voltage swing.

Regards, E
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Old 18th February 2012, 08:08 AM   #674
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Diodes are interesting when low impedance loads are used as they increase considerably the available current. Though, in that case, it's not the voltage that counts.
Using 8 ohm load, little voltage is gained as long as voltage drop across source resistors is not that high.
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Old 21st February 2012, 07:12 AM   #675
ENSen is offline ENSen  Sweden
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I have a BA-2 and was thinking of trying the BA-3. I have separated the PCBs for left and right FE for my BA-2 and I would like to do the same for BA-3 to be able mount them in the same place using the same wiring. When I checked the pictures of the BA-3 boards in the diyaudio shop I noticed that they do not have mounting holes in the middle. So if I separate the left and right FE I will only have mounting holes in one end of them. Is this done by purpose? Is there a reason why one should not separate left and right PCBs?
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File Type: jpg BA-3_FE.JPG (38.3 KB, 324 views)
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Old 21st February 2012, 07:28 AM   #676
Variac is offline Variac  United States
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It just got too difficult for Papa to fit everything in and we didn't think many people were cutting them.. .. As far as I know, there is no reason not to cut them. Using 2 holes on the side of each piece is probably enough. and there's a line to help guide your Dremal tool!

Which of the corner holes are you using? the ones in the extreme corners or the ones inboard a bit?
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Old 21st February 2012, 07:35 AM   #677
ENSen is offline ENSen  Sweden
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Thank you for the quick answer Variac. I am using the holes in the extreme corners but maybe I should use the other holes for the BA-3 to get a little better force distribution?
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Old 21st February 2012, 08:54 AM   #678
Variac is offline Variac  United States
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I think either way will be fine, but I guess the inner holes would be stronger.
But bolting them right in is pretty appealing, right?
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Old 21st February 2012, 08:56 AM   #679
ENSen is offline ENSen  Sweden
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Yes, it is appealing but it's not that bad to drill a few new holes.
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Old 21st February 2012, 10:55 AM   #680
Darry is offline Darry  France
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The output stage of BA1 works in pure single-ended.

With 0.58 A per MOSFET (6), the BA1 provides, with ± 32V, 50 watts into 8 ohms, 25 watts into 4 ohms but only 12 of 2 ohms, ...

Is there a "small" circuit that could push the output stage in class AB (in the style of the Aleph 0, 0s and 1), for at least 50 watts into 4 ohms and 2.

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Darry
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