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Old 28th March 2013, 06:20 PM   #11
alex mm is offline alex mm  Romania
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Location: Baia Mare ,
Default PCB rev 1.2

......have layout again , find some errors , corrected and revised
Regards Alex.
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Old 30th March 2013, 06:50 AM   #12
sajti is offline sajti  Hungary
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Looks nice, as always Alex!

I'm working on my version, with bjt input stage...

Sajti
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Old 30th March 2013, 07:23 AM   #13
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by alex mm View Post
......have layout again , find some errors , corrected and revised
Regards Alex.
Hi Alex

Very nice pcb layout. But I have a question. There are 8 transistors laying under the pcb, 8 transistors x 3 leads = 24 leads have to insert to the pcb before soldering. Is there any way to make sure it has no problem when inserting the leads through the pad holes?
I have designed some similiar pcb layouts but keep wondering if there will be any problem to insert the leads of transistors into the pad holes on the pcb.

Thanks
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Old 30th March 2013, 07:45 AM   #14
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Very nice layout, Alex.
Your PCB layout skill is great!
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Old 30th March 2013, 10:21 AM   #15
alex mm is offline alex mm  Romania
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Hi SSDIY,

First you can insert , each transistor in position , solder each , and after mount pcb to the heatsink , ofcourse not so easy but with some skill you can do the job Thanks for kindnes .
Regards Alex.
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Old 30th March 2013, 11:40 AM   #16
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make a metal or galvanized sheet pattern.. for me i cut a hole enough to mount the transistor.
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Old 30th March 2013, 12:15 PM   #17
AndrewT is offline AndrewT  Scotland
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Solder just ONE lead of each output device. Maybe to just one side of the pad rather than all round.
This holds the transistors roughly, but not rigidly, in place.
Bolt or clamp to your heatsink.

Then when all is correctly aligned, re-solder that first lead to release any strain on that part soldered leadout.
Finally solder all the other leadouts.
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regards Andrew T.
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Old 30th March 2013, 12:43 PM   #18
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that is good if your pcb has plated through hole
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Old 1st April 2013, 04:59 PM   #19
alex mm is offline alex mm  Romania
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Join Date: Mar 2006
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Default PCB rev 1.3

.......few mistakes ,revised again , better ground layout etc .
Regards Alex.
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Old 1st April 2013, 05:20 PM   #20
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This amp doesn't have safe operating area protection; short the output and you have one dead amp.
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