connecting heatsinks in series

[reddish75]

hi is there any drawbacks to connecting heatsinks in series to make a large one for output transistors?

regards

chris

[wakibaki]

What exactly do you mean?

How are you going to connect them 'in series'? Edge to edge? How are you going to ensure a snug fit? Short edges? Or back-to-back?

You better explain a bit more the exact physical layout you intend...

w

[AndrewT]

could you mean parallel?
If there are alternative routes for heatflow then I call that parallel.

If all the heatflow must pass, in sequence, through all the heatsinks then I define that as in series.

[sakis]

using separated hetasinks for N transistors and seperated for P is guarantee of thermal run away

[AKN]

Hi,

Originally Posted by sakis

using separated hetasinks for N transistors and seperated for P is guarantee of thermal run away

Why? As long as there is no severe DC offset the same current pass N and P transistors. Cooling symmetry (P N) will be required though.

[sakis]

wrong even audio signal it shelf migh include pos or neg peaks of diferent magnitute that might drive the p or the n side of the amp warmer than the other ....now if the vbe multiplier is attached on the other side will not sense that and if the amp is pushed then kabooooooom

[AKN]

Under such circumstances I agree of course.

[stratus46]

Originally Posted by 4fun

Hi,



Why? As long as there is no severe DC offset the same current pass N and P transistors. Cooling symmetry (P N) will be required though.

Parallel transistors must share a heatsink.

G²

[AKN]

Originally Posted by stratus46

Parallel transistors must share a heatsink.

G²

Did I write otherwise?

[reddish75]

yes sorry i should have been more clear, yes they would be connected edge to edge, and the pcb and output trannys would sandwich a piece of aluminium angle which would in turn run the length of both heatsinks.