Combined Onaudio thread. (23 threads)

[OnAudio]

OPB PCB

If interested add your name to this list.

The amplifier can be found here
http://www.diyaudio.com/forums/solid-state/207746-hal-opb-amplifier.html

 

[OnAudio]

2DIFFEF PCB

If interested add your name to this list.

The amplifier can be found here
http://www.diyaudio.com/forums/solid-state/211966-chameleon-mode-2diffef-amplifier.html

 

[OnAudio]

These could also be used

An externally hosted image should be here but it was not working when we last tested it.

MJH6284G ON Semiconductor | MJH6284GOS-ND | DigiKey

 

[undefinedza]

If interested add your name to this list.

The amplifier can be found here
http://www.diyaudio.com/forums/solid-state/211966-chameleon-mode-2diffef-amplifier.html

Hi OnAudio,

What exactly is the procedure here?

I'd like to build this amplifier.

Chris

 

[OnAudio]

Hi OnAudio,

What exactly is the procedure here?

I'd like to build this amplifier.

Chris

Your Free to start a group buy. Drowranger was preparing a PCB. If his isnt ready will prepare one .

 

[gaborbela]

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🙂

 

[Francois G]

How to attach the output transistors

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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

 

[evette]

Simple Mount the outputs under the board and gently bend the leads. Regards Evette

 

[Francois G]

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

 

[evette]

Mr. Sir Francois if you take q5 and lay it flat on your hs towards the fuse holder now line up your pcb over the top of it and you,ll see they line up ( lead wise) perfectly. Regards Evette

 

[OnAudio]

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 🙂

 

[OnAudio]

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

 

[brianco]

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.