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#111 |
diyAudio Member
Join Date: Feb 2004
Location: utrecht
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Based on my experience with pre-amps and phono-amps, when the design of the functional part is good most critical is the PSU. I agree with Nigel's PSU first.
I think Salas sym PSU B1 is a very interesting option. Does someone have a clue how many buffers, filter-stages, one could hook up to that specific B-1 design? Regards Michiel |
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#112 | |
diyAudio Member
Join Date: Aug 2008
Location: Maine
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Quote:
I'm using separate regulator circuits for the filters (which will be essentially the Salas circuit from the sym B1 thread) and for the output buffers, which are the ones from juma's BF862 preamp thread. I'm hoping (and expecting) one salas PSU is enough for the filters - if anyone thinks otherwise please let me know while there's still time to adjust the design... Cheers Nigel |
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#113 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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I would be tempted to use a separate pair of regulators for each channel.
Then I would consider using separate regulators for the upper frequency range from the lower frequency range. The input buffer could be run off the lower frequency range. That's 4 pairs of regulators for a stereo crossover.
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regards Andrew T. |
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#114 | |
diyAudio Member
Join Date: Aug 2008
Location: Maine
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Quote:
![]() Cheers Nigel |
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#115 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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builders are reporting very good SQ results for B1s on discrete shunt regulators.
Most are hanging only two B1s on one pair of regulators. How many B1s will your crossover have?
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regards Andrew T. |
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#116 | |
diyAudio Member
Join Date: Aug 2008
Location: Maine
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I had almost finished a reply when the power went out for a couple of minutes, and internet service took ages to come back... Annoying as all hell; on the other hand every time I moan about bad aspects of life in Brazil I should reflect on the fact that here today it is warm and sunny with a mild breeze, just about perfect (as it is most days, really...), whereas AndrewT and everyone else in the UK has rather different weather....
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Cheers Nigel |
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#117 |
diyAudio Member
Join Date: Aug 2008
Location: Maine
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Sorry ! Total of 18, not 14... The schematic I am planning is posted on post #82, except for some component values.. So total current in the filter section should be around 182mA, not 130...
Cheers Nigel |
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#118 | ||
diyAudio Member
Join Date: Oct 2004
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Quote:
The picture shows only a part of the board. I started building the second channel, when the first buffer stage was finishedm out of curiosity I thought how would it sound if I bufferred the output from my Twisted Pear Sabre DAC before hitting the 10K stepped attenuator. The improvement was so much, I decided to leave it there, so I will add back another B1 stage into the channel shown. Quote:
I plan to build a shunt regulator later on, probably rebuild the whole thing on PCB. I will be housing it in an old cabinet, I have lying around from another project from a couple of years back. Sound wise, the first thing the strikes you is that the sound stage moved forward, like going from 15th row to something closer to the performance. Given that I do not yet have the second channel built, I cannot be too sure of this. The articulation improved a lot and so now I can play it at lower levels than I used to. Of course, last few days nothing is playing, because the power amp is getting a make over. I am adding a second board to the power amp so that I can drive 4 drivers independantly. Once the second PA-03 board is complete, I will get back to building the rest of the cross-over. I am convinced that this is a very worthy project despite the effort it takes to build it P-P. I would be a great thing to design a small PCB that can take 2 channels single filters. Then you can just use these as building blocks. One for buffer, one for LP, one for HP and on and on, just chaining them as needed. I don't have the software tools for PCB design, but we'll see. Regards, Dinesh |
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#119 |
Passive Aggressive
diyAudio Member
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Dinesh,
Look for Dip Trace. Its a very good pcb software and you can use it for free. Uriah
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purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com |
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#120 |
diyAudio Member
Join Date: Dec 2005
Location: Toronto
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I think this project looks really interesting. I am toying with the discrete x-over idea myself, but you guys are way in front of me. After having played with an XVR1 at a delayed "after-party" to the burning amp festival I must say that I'm really into this way of doing speaker designs!
If you want me to, I would love to design a PCB for this B1 based crossover since I would probably be doing it anyway. ![]() The XVR1 uses jumpers, which I find really nice when testing - you can select the frequency and Q. DIP switches can also be used and may be easier to work with. It does require a lot of different resistors, but you get a really versatile tool for future projects. |
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