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Old 11th May 2013, 10:38 AM   #11
AJT is offline AJT  Philippines
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which makes me wonder, if he can mount the trannies directly without those plates, that would be best.....
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Old 11th May 2013, 10:38 AM   #12
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Quote:
Originally Posted by Elvee View Post
Which is preferable anyway to relieve the stress caused by straight legs.
Translation to avoid project16 the inconvenience of using a translator:
Il est préférable de plier les pattes des transistors pour éviter les contraintes causées par un montage droit

You can deepen please!

Regards!
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Old 11th May 2013, 10:43 AM   #13
AJT is offline AJT  Philippines
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Quote:
Originally Posted by Project16 View Post
This is to avoid bending the legs of the transistors.
But I can (by bending the legs of Sanken) fix directemment on the main heatsink but I have to add an aluminum thickness for BD139 and 140 because the legs are too short.
Why 6 mm:
Is the distance between the base of one and the edge of Sanken PCB.

if you must, small plate spacers for the bd139/140 would be easier to do...
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Old 11th May 2013, 10:51 AM   #14
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Ok, thank you all and I really do ask the question.
To summarize you have convinced me that it is best to directly heat sink for the power transistors.
I put a spacer under the BD because I do not have a choice or when connected to the plate by the very short thread.
I understood that Elvee meant, he spoke of mechanical stress I think.

Again thank you!
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Old 11th May 2013, 10:58 AM   #15
AJT is offline AJT  Philippines
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our pleasure....
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Old 11th May 2013, 09:57 PM   #16
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Probably L profile aluminium heat spreader is another option. But it seems there is not too much space on pcb to support the spreader from bottom.

Look at this one:

Alternative buffer topologies

Last edited by terranigma; 11th May 2013 at 10:01 PM.
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Old 14th May 2013, 09:13 PM   #17
JMFahey is offline JMFahey  Argentina
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1) sorry but the PCB design is not the best.
It should put transistor pads closer to an edge, so you can attach it easily to the heatsink or an aluminum backpanel

2) if you don't want to redo the PCB, you can (should) mount the transistors straight to the heatsink, and add small wire links so legs reach PCB holes.

3) si vous avez quelques problèmes, vous pouvez écrire en Français, mais même ça, postez la traduction Anglaise.
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Old 16th May 2013, 10:15 AM   #18
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Quote:
Originally Posted by JMFahey View Post
if you don't want to redo the PCB, you can (should) mount the transistors straight to the heatsink, and add small wire links so legs reach PCB holes.
Yes, this is the solution which I think is the best!

Thank you all!
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