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Old 18th May 2017, 07:40 AM   #1
thimios is offline thimios  Greece
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Location: Agrinion
Default SA2015 V-MOSFET Builders

SA2015 V-MOSFET (70W@8R, 140W@4R).
Using 3 matched pairs IRFP240 and IRFP9240 as final (current amp.stage)without using special(difficult to find)parts.
Here is the official thread. 2stageEF high performance class AB power amp / 200W8R / 400W4R
Let's go from the start to the end.
Here is the schematic diagram.
All the files are free for noncommercial use.
Pcb are also available.
First fitting some parts,not soldered yet.
All parts used in this amplifier is one person donation .
Thanks dear!
The protection MCU is another person donation.
Thanks!
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File Type: jpg some early steps.JPG (548.0 KB, 489 views)
File Type: jpg my sa2015.JPG (561.7 KB, 471 views)
Attached Files
File Type: pdf sa2015_mosfet_rev1.3_schematic.pdf (39.8 KB, 140 views)

Last edited by thimios; 19th May 2017 at 12:04 PM.
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Old 18th May 2017, 02:22 PM   #2
thimios is offline thimios  Greece
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Default SA2015

Start soldering parts.
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Old 18th May 2017, 03:54 PM   #3
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Hello Thimios

Your post:
2stageEF high performance class AB power amp / 200W8R / 400W4R

It is better to return your plate with holes because so you have a space between the bottom of the case to house the screws.

Regard's
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Old 18th May 2017, 05:55 PM   #4
thimios is offline thimios  Greece
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Quote:
Originally Posted by Project16 View Post
Hello Thimios

Your post:
2stageEF high performance class AB power amp / 200W8R / 400W4R

It is better to return your plate with holes because so you have a space between the bottom of the case to house the screws.

Regard's
Got it!
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Old 19th May 2017, 05:24 AM   #5
thimios is offline thimios  Greece
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1)A compleate populated board.
2)Prepairing an old heatsink for a prove sitting.
Tips.Screw all the transistors in position then put the pcb and solder them.
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File Type: jpg DSC09890.JPG (590.2 KB, 153 views)

Last edited by thimios; 19th May 2017 at 05:46 AM.
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Old 19th May 2017, 07:02 AM   #6
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Quote:
Originally Posted by thimios View Post
Tips.Screw all the transistors in position then put the pcb and solder them.
Sounds reasonable, but, due to the narrow space between the six electrolytics and the emitter balancing resistors, appears to be quite challenging.

Best regards!
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Old 19th May 2017, 07:29 AM   #7
astx is offline astx  Austria
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Yes, better solder the six electrolytics AFTER output transistors are mounted and soldered!
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Old 19th May 2017, 08:56 AM   #8
thimios is offline thimios  Greece
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Quote:
Originally Posted by astx View Post
Yes, better solder the six electrolytics AFTER output transistors are mounted and soldered!
I like your way,much easier,but i'm trying not to push hard the pcb and crack the connections when screwing. Easy way to keep the isolation pads in the right position too.
keeping solder gun in vertical position isn't difficult to solder between these parts.
BTW i will try yours when i will mound the boards to its final position. I hope not need to desolder....

Last edited by thimios; 19th May 2017 at 09:05 AM.
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Old 19th May 2017, 12:18 PM   #9
thimios is offline thimios  Greece
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1)Details of Vbe multip.
2)Two channels ready for first test.
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Old 19th May 2017, 02:50 PM   #10
AndrewT is offline AndrewT  Scotland
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I placed a squishy spacer between the PCB and the back of the To92 to ensure physical contact for better heat conduction.

I too had trouble with soldering the outputs after soldering the Capacitors.
I did consider doing in the opposite order but rejected it because one has to remove the whole lot to get to the solder side of the capacitors.
I could not come up with a better order for soldering.

I also wanted to use To264 but found the bigger size and the narrow spacing prevented the clamping bolts fitting in between.

If only the front end had been on a Daughter board and the output board stretched a bit to make soldering and bolting a bit easier.

The Daughter board could clip on via a 10X2 dual 20way plug/socket, using multiple pins for each connection. This would allow the Daughter board to lie flat across the enclosure enabling easier measurements during testing.
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