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Old 16th January 2014, 06:03 PM   #581
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Quote:
Originally Posted by NicMac View Post
Not all have your beautiful boards
Thank you

I could give you the Gerber files. So you could do your own boards.
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Old 16th January 2014, 07:47 PM   #582
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by permaneder View Post
Thank you

I could give you the Gerber files. So you could do your own boards.
Can you post the Gerbers and/or the PDFs?
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Old 19th January 2014, 01:37 PM   #583
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I would like to have a pair of PCB's also.
PDF's would work best for me since, I have not used board house services before.
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Old 26th January 2014, 06:38 AM   #584
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Default Power supply question

Hi Juma,

For this power supply Novi amp sa 2SK2013/2SJ313 - Stranica 2 - Solid State - diyAudio.rs (and attached), I wanted to confirm that the source of the IRFP044N is on the transformer side of the rails (because maybe the symbol is backwards?).

Is it better to use four huge capacitors instead of paralleling smaller ones in this circuit? (. . . just wondering, since there's lots of people on the forum filling up the middle of their amps with 1000s of small caps, etc.) Dd you use the 1uF film caps shown on the schematic (C1-C4), and, if so, what did you use?

Thanks, David (a/k/a "moving ahead at a snails pace. . . ")

p.s. Also, I wanted to express my thanks for all of the cool projects you have posted here over the years, and for being such a great teacher.
Attached Images
File Type: png PS schematic.png (21.5 KB, 348 views)
File Type: png IRFP044pic.png (38.4 KB, 344 views)
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Old 26th January 2014, 11:03 AM   #585
juma is offline juma  Serbia
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Quote:
Originally Posted by David A.M. View Post
I wanted to confirm that the source of the IRFP044N is on the transformer side of the rails (because maybe the symbol is backwards?).
Nothing is backward there and sources are not "on the transformer side" (whatever that might mean since the only parts on the transformer side are rectifier bridges). Actually, I'm not sure at all what are you supposing/asking here but let's put it this way:
IRFP044 is N-channel MOSFET and as such it needs its Drain to be on higher potential than the Source in order to operate. For example, in the sch. you quote, the Source of Q1 is at +22V and the Drain is at about +26V. That schematic is a bit unusual since it uses N-channel MOSFETs for both positive and the negative rail but don't get confused, just make it exactly as drawn and you'll be ok (as long as you are able to distinguish source from the drain - be careful about that).

Quote:
Originally Posted by David A.M. View Post
Is it better to use four huge capacitors instead of paralleling smaller ones in this circuit? ...
I used 4 big Panasonic caps (33mF/35V) and 1uF Philips MKC (as drawn in sch.)
A lot of smaller caps might give bigger total ripple current but unpredictable impedance situation (crazy resonant peaks) are possibility too.
Whatever path you choose to follow, make sure you use good quality caps. I've listened to version of this amp made with cheap chinese PSU caps (which were tested good on Sencore LC103 cap & coil analyzer) and it sounded intolerably dull...
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Old 26th January 2014, 11:28 AM   #586
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by David A.M. View Post
......... I wanted to confirm that the source of the IRFP044N is on the transformer side of the rails (because maybe the symbol is backwards?). .........
Quote:
Originally Posted by juma View Post
Nothing is backward there and sources are not "on the transformer side" (whatever that might mean since the only parts on the transformer side are rectifier bridges). Actually, I'm not sure at all what are you supposing/asking here but let's put it this way:
IRFP044 is N-channel MOSFET and as such it needs its Drain to be on higher potential than the Source in order to operate. For example, in the sch. you quote, the Source of Q1 is at +22V and the Drain is at about +26V.............
All vertical mosFETs have the Drain pin in the middle and connected to the rear mounting plate.

The Middle Pin (of an N channel vFET) goes to the higher +ve voltage.
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Old 27th March 2014, 08:25 AM   #587
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I'd like to share few pictures of my first amp based on F5 Juma version 1 with 5 instead of 3 output mosfet pairs. I also added into the same housing Juma preamp and my sofswitch/DC offset filter/AC filter PCB. What is missing is a final version of input selector and volume control.
Attached Images
File Type: jpg F5 Juma front.JPG (233.6 KB, 210 views)
File Type: jpg F5 Juma back.JPG (362.0 KB, 204 views)
File Type: jpg F5 Juma top open.JPG (340.4 KB, 178 views)
File Type: jpg F5 Juma channel2.JPG (260.8 KB, 119 views)
File Type: jpg F5 Juma PCB.JPG (149.1 KB, 118 views)
File Type: jpg Sstart PCB.JPG (520.9 KB, 90 views)
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Old 27th March 2014, 10:44 AM   #588
juma is offline juma  Serbia
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Great job prasimix

Just two things:
- make sure to listen to your amp with 3 and with 5 output pairs - it won't sound the same...
- you made a great project and it hurts me to see that you use the dish-washer/lawn-mower style connections inside it. Those connectors (see attachment) have no place in serious audio equipment (unsatisfying electromechanical properties and compromised long term reliability). Let your soldering iron do that...
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File Type: jpg bzvz.jpg (1.6 KB, 198 views)
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Old 27th March 2014, 11:29 AM   #589
AndrewT is offline AndrewT  Scotland
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Juma,
are you telling us that spade terminals are good, or bad, for audio?
Or
Are you telling us that screw down terminals are good, or bad, for audio?
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Old 27th March 2014, 11:41 AM   #590
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Quote:
Originally Posted by AndrewT View Post
Juma,
are you telling us that spade terminals are good, or bad, for audio?
Or
Are you telling us that screw down terminals are good, or bad, for audio?
I believe juma is referring to the spades as per his photo.

I also prefer to solder all the connections between boards and as little as possible. It might not make a difference in sound, but if one excludes a bunch of solder points and different metal connections from a build it can't hurt! KISS I think!
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