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Combined Onaudio thread. (23 threads)

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G

gaborbela

Member
Joined 2005
PC board order info

Hello
I'm interested on one pair SYMEF amplifier ad also on these "PC boards attached" one pair...
How I can order or participate in the "group buy"
Greetings Gabor:)
 

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Francois G

Francois G

Member
Joined 2004
Paid Member
How to attach the output transistors

OnAudio said:
[/URL]

298762d1346301242-symef-2nd-generation-pcb-group-thing-symefpcb.png
Click to expand...

My SYMEF type 2 PCBs arrived and look great. Thanks HAL. They seem the same as this draft, at least regarding the orientaion of the output transistors.

I am puzzled however with the orientation of the output transistors. How do I attach them to the heatsink and get the leads in the right PCB orientation as shown.

I'll appreciate an explanation; picture would be even better.

Thanks,
Francois
 
Francois G

Francois G

Member
Joined 2004
Paid Member
Evette,

Thanks for your reply.

The problem is that if the output transistors are mounted to a heatsink (with the metal tabs on the heatsink) then the leads have to be "switched" to match the PCB orientation of the leads. Am I misunderstanding something?

Thanks.
Francois
 
OnAudio

OnAudio

Member
Joined 2011
Hi Francois,

As Joe put it lay the transistors flat on heat-sink and bend pins up . This will be an art. Attached is a sample. You need to watch the clearance of the bolt head from the PCB.

Have fun :)
 

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OnAudio

OnAudio

Member
Joined 2011
1. Place unpopulated PCB on heat-sink.
2. Use ink to mark the lead positions on the heat-sink.
3. Place transistors on heat sink with the pins bent straight up
4. Align the transistors leads with the ink marks
5. Use ink to mark the mounting holes of each transistor
6. Drill mounting holes
7. Mount transistors
8. Populate PCB
9. Place PCB over transistors
10. solder the transistors
 
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brianco

brianco

Member
Joined 2005
The link to the BoM appears to have changed (due to thread moving?). Be grateful for another link as my mac seems to have lost (which is my fault) the original download!!

Can you perhaps point me in the right direction? Mainly interested in BoM for latest boards.

Many thanks,

B

EDIT: just found the latest revision in .pdf format, but it will not open (for me) on Mac 10.7.5.
 
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