Are you going to share the diptrace files. I may just have get windscreen under too.
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Ciss
ALF = 900pf
IRFP240 =1300pf
The drivers are just dealing with capacitance. A 5 pair slewmaster with
hexfets would be 6500pf !
Same with the BJT Cob @ 400-600pf per device.
I have not built latfet OPS's ... but I notice Rod Elliots project 101
Project 101 - High Power, High Fidelity Lateral MOSFET power amplifier
deals with Ciss both with C7 , C11 , and C12. C7 paralleled with the bias
spreader would only function as a "suckout cap" to deal with Ciss
at the X-over point. C11-12 equalize Ciss between P/N devices.
This seems to be needed as he is driving the latfets directly
from the VAS.
PS - just some observations ...
OS
I like post #1274
looking good sir 🙂
Juan
http://www.diyaudio.com/forums/solid-state/260268-slewmaster-builds-128.html#post4502590
looking good sir 🙂
Juan
http://www.diyaudio.com/forums/solid-state/260268-slewmaster-builds-128.html#post4502590
Let me a little time include your previous advices and i will share files of courses only for diy use🙂
Marc
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Hi Idefixes,
Beautiful layout indeed. It may be better if polygon isolation is increased a bit as the width is very narrow near mounting holes. ( Dont know about diptrace, but eagle has an option for "isolate".
Octave1
edit: which ips would be ideal for this?
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For isolation i play a little bit with diptrace and there is no action on mounting hole isolation. It is mounting hole so no copper in the surround circle. I will take a look if can optimize this point.
Take a look at http://www.diyaudio.com/forums/group-buys/257057-slewmaster-project-boards-74.html#post4498510 These board is done with the same way. You can see at the bottom the hole, there is no copper.
For the IPS ask i don't know. I wil be able to test with CFA XH IPS, VSHA ECC88 IPS, VSHA 6SN7 IPS, Krypton ND and Wolverine.
Marc
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Marc,
I wondered over to your web pages. You have some very nice looking kit.
Sent from my HUAWEI MT7-L09 using Tapatalk
I wondered over to your web pages. You have some very nice looking kit.
Sent from my HUAWEI MT7-L09 using Tapatalk
I have to update the website with Slewmaster chapter and some other stuff as spraygun painting, plunge saw use.....
Marc
5-pair OPS PSU ideas
Hello,
is there any recommendation for a PSU for 5-pair OPS? I mean filter capacitance recommendation, PSU board layout ideas, etc.
I have quite weird capacitors, so I think I will be unable to use any existing layouts anyway, but it's always better to see how did more experienced builders do the job.
I was looking at the diyaudio universal PSU http://www.diyaudio.com/forums/images/diy/store/board-documentation/P-PSU-1V30/P-PSU-1V30-schematic.pdf, but it seems too complicated to me.
Any advice?
Thanks a lot
Stefan
Hello,
is there any recommendation for a PSU for 5-pair OPS? I mean filter capacitance recommendation, PSU board layout ideas, etc.
I have quite weird capacitors, so I think I will be unable to use any existing layouts anyway, but it's always better to see how did more experienced builders do the job.
I was looking at the diyaudio universal PSU http://www.diyaudio.com/forums/images/diy/store/board-documentation/P-PSU-1V30/P-PSU-1V30-schematic.pdf, but it seems too complicated to me.
Any advice?
Thanks a lot
Stefan
What do you have for capacitors? OS's design accepts most. CRC filters aren't needed for the Slewmaster.
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6800uF/100V
I'm concerned about the total capacitance required per rail. I haven't found any recommendation besides "the more the better", so I can't decide how many of these should I use (which affects the layout of course). I have 25 pcs in total, so in theory I can use 6 per rail, which would get me 40 800 uF per rail. Is it too much, or ...?
Thanks.
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I go by Randy Slone's recommendation of 10000uF for every 100 watts of output per rail, but this is very open to different opinions. What rail voltage to you plan to run? 40000mF would be right in line for a 200W stereo amp.
I have two toroid 500VA transformers with 2x55V secondaries, so I will be running close to +/- 80V DC rails. I will be using dual mono configuration.
So according to that recommendation, I could be fine with 3x6800uF per rail (20 400uF) in dual mono 200W amp.
Or if I use 4x6800=27 200uF it would give some extra margin.
Is there any audible benefit using more capacity?
What capacity do You have in your amp?
Thanks a lot.
With those transformers you should be good with just 3. Extra capacitance helps for bass if your transformers are weak. I think you'll be closer to 300W but you have lots of headroom with 500VA transformers.
I've got 44000uF per rail in mine, but the caps were on sale.😀
I've got 44000uF per rail in mine, but the caps were on sale.😀
OK, so now I have the minimum capacitance set. I will see what would fit into the chassis and make my own board according to available space. I already have those 25 caps, so I don't mind use them all if they fit in and makes sense.
Thanks again, that helped me to move on.
