Make the first one, unregulated. If you want to make upgrades and use a regulated PSU, you can do it afterwards. I tested mine with both my unregulated PSU and with the power supply from the image and I coudn't hear any sound difference.
An externally hosted image should be here but it was not working when we last tested it.
Hi, I've made Alex88's BPA300, and I would like to have a great snubbed PSU 4 them
Can I use Carlosfm's unregulated PSU to drive BPA 300 or this one is good only for a single (or double) Lm3886???
What shall I change on it to work properly with 2 (or 4) BPA150 Board??
Thanks 4 helping me out
Can I use Carlosfm's unregulated PSU to drive BPA 300 or this one is good only for a single (or double) Lm3886???
What shall I change on it to work properly with 2 (or 4) BPA150 Board??
Thanks 4 helping me out
madam said:
- - The transformer must be bigger. CarlosFM's version uses 250 VA, if I remember correctly. BPA 200 uses 2 x 385 VA, which should be your benchmark for BPA 300 as well.
- The MUR860 must be replaced with diodes or rectifier bridges that are capable of the increased current demands. The new rectifiers may need snubbers of their own to be determined.
- Depending on the version you want to build, you will need more smoothing capacity. Again BPA 200 shoud be your benchmark with 1.200 µF + 4 * (10.000 µF + 470 µF + 0,1 µF) per rail.
The easy way is one Carlos FM snubberised to each chipamp.
I suspect that an inverting and non-inverting pair could be run from a single Carlos FM snubberised. But, don't run a parallel pair from one PSU.
Powering the opposite pairs this way will require just three PSUs for a BPA300.
If we follow the usual recommendation of VA = max output power to twice max output power then a 300VA to 600VA should be sufficient to power one BPA300. I would use 500VA or 625VA for a 360W amplifier.
I suspect that an inverting and non-inverting pair could be run from a single Carlos FM snubberised. But, don't run a parallel pair from one PSU.
Powering the opposite pairs this way will require just three PSUs for a BPA300.
If we follow the usual recommendation of VA = max output power to twice max output power then a 300VA to 600VA should be sufficient to power one BPA300. I would use 500VA or 625VA for a 360W amplifier.
That would be six snubberised power supplies for one amplifier. That is the easy way as opposed to ...?AndrewT said:
On these working conditions the MUR860s would probably welcome some heatsinking.AndrewT said:
What is wrong with making a single big power supply with a decent high current bridge rectifier? For those, who hear a difference, snubbers can be refitted to make it perform just as well as the MURs above the audio range.
pacificblue said:
I meeeen 1 PSU board per 1 or 2 of the PBA150 board (if 2 boards, only in the same signal-polarity) .... with some higher caps/more 10.000uF in the rail.
I know I would need more power(and caps) I have a 800VA toroid to support the unit, and 2X47.000uF at the moment.
But if I make an upgrade I would make a good-one and not an "intermadiate" one. (would make a goood PCB for it)
There is nothin' wrong with the bridges..... but if I make a great unit (and I did) and would like to upgrade it..... than why not upgrade to some serious diodes too? It should worth the money and effort if they are so widely used.... with the great results we all know. There must be other diodes, fast and relyable like the MUR in higher Ampers...... And I would be O.K. to have one BIIIIIIG unit of PSU, if it's works just fine with the 4 BPA boards I must drive with.
That is what the high current bridge rectifiers are.madam said:
MUR3060 exist as well. That is 15 A average, 30 A repetitive peak and 150 A non-repetitive peak up to 600 V. Heatsinking is of course required for reliable operation.madam said:
Then there are the RURG3060 with 30 A average, 70 A repetitive and 325 A non-repetitive also up to 600 V.
Even faster switching with 23 ns is the state-of-the-art HEXFred HFA25PB60 (MUR860 -> 50 ns) with 25 A average, 100 A repetitive and 225 A non-repetitive up to 600 V.
The point with all of them is, the fast switching is supposed to bring ringing down, which is the same you do with a snubber across "normal" rectifier diodes much cheaper.
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