Is it possible for you to send me(or provide) the Gerbers?
I'd like to see how this sounds compared to the Cubie 2.
Thanks...
I'd like to see how this sounds compared to the Cubie 2.
Thanks...
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Thank you Prasi.
I was able to import everything into Sprint-Layout and everything looks good, except for the Excellon drill file.
The vias are above the board and really scattered out. Frustrating...I wish these files would be more standardized.
Why not use them as they are. board house would have no problems processing NCD and other gerbers posted.
reg
Prasi
Most board houses I've dealt with, like OSH Park, require drill files in text(.TXT) format.
May be a simple matter of renaming your .ncd file, but I would like to know why the drills don't display correctly in Sprint.
Did you tested the small transistors pin out - just read some BC550 & 560 has different pin out from a company who just started to produce those devices.
JUMA built a working amp that mean something wrong with your build.
Nice layout!
JUMA built a working amp that mean something wrong with your build.
Nice layout!
While I can't figure out what is wrong with the build, I thought I'd play with the new Prasi layout, possibly to start over. Here's my super-sharpie Prasi version.
Nice. I cant seem to locate C3.
C3. I didn't move any holes. Just added copper. Big a$$ soldering pads. Smooth traces.
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PSU
Amp is incomplete without PSU.😀 This is what I could come up with. I have no way of telling if it will fulfill the design requirements.
reg
Prasi
Amp is incomplete without PSU.😀 This is what I could come up with. I have no way of telling if it will fulfill the design requirements.
reg
Prasi
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Juma,
1. Can this PSU be upscaled for +/- 56 V (obtained from ~40VAC-0-40VAC trafo that I have) for supplying to other stereo class AB amps other than capacitor voltage specs?
2. What would be DC o/p voltage in case of above 40 VAC trafo? I see that you have mentioned +/-36V from a 30VAC-0-30VAC trafo.
3.what are the advantages compared to simple rectifier+caps bulk PSU.?
reg
Prasi
Hi Prasi,
1. No. It would be too much for a single output pair. Further modifications would be needed in the front end/VAS too.
I used a cap multipler in the PSU (see post #1) hence the the +/-36V DC out of 2x30V AC because it sounds better to me than just a rectifier + caps.
You can try to regulate the PSU that you have down to +/-36V but I suppose it would be too impractical (too much heat developed in the PSU).
1. No. It would be too much for a single output pair. Further modifications would be needed in the front end/VAS too.
I used a cap multipler in the PSU (see post #1) hence the the +/-36V DC out of 2x30V AC because it sounds better to me than just a rectifier + caps.
You can try to regulate the PSU that you have down to +/-36V but I suppose it would be too impractical (too much heat developed in the PSU).
Hi Juma,
Thank you for explanation.
To Gaborbela and Marsupialx,
I am attaching the pdfs of PSU Cubie-3 for builders. again, clearances >24 mils, 0.635mm thick annular pads. make a sharpie version, if you like😀.
reg
Prasi
I'm ready to etch again. Thanks, prasi!!!
Don't mention it. curves look too good. if you are using corel, If possible overlay your layout with posted silk to see if traces have not moved accidentally. its very unlikely, but still better to make sure.
reg
prasi
No traces have been harmed in the sharpie markeresque conversion. As I work, I constantly have the original on a separate layer in Photoshop.
drill.txt
Hi Ammel68,
I have attached new gerbers, ones that have a drill file in txt format . see if this is what you require.
reg
Prasi
Hi Ammel68,
I have attached new gerbers, ones that have a drill file in txt format . see if this is what you require.
reg
Prasi
Attachments
Completely stuffed except transistors. All resistors metered before stuffing. Built a transistor tester. Tested 550 and 560 transistors. Next I'll test 639 / 640. Then jfets. By golly, this time everything is going to be as above board as I can manage. We'll see. If I get this one working, I'll go back and see where I screwed up the last one. Marsupialx out.