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3886inv gainclone PCB,group buy

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maxw said:
How hot do these regulators get?
I am using two LM338 per channel in a dual mono GC.
So thats two of these for one LM3875 IC with a transformer with an output of 2x25V.
Would a piece of aluminium say 10x30x140mm be enough?

how many is the drop voltage of the LM338?

the heatsink that I have used is a piece of aluminium 80¡Á138¡Á40mm,an output of 2X18VDC.it is warm,can touch with finger.
in my amp,the drop voltage is 4V per regulator(the transformer is 2X18VAC,then 22VDC to the regulator chip,adjusting,then output 18VDC).

in the attached pic,the upper one is the heatsink that I am using.


thank you Peranders:)
 

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digi01 said:


how many is the drop voltage of the LM338?
I guess it will be like 25VAC out, rectified to 35VDC then regulated to 31V.

digi01 said:
the heatsink that I have used is a piece of aluminium 80¡Á138¡Á40mm,an output of 2X18VDC.it is warm,can touch with finger.
in my amp,the drop voltage is 4V per regulator(the transformer is 2X18VAC,then 22VDC to the regulator chip,adjusting,then output 18VDC).

in the attached pic,the upper one is the heatsink that I am using.

Thanks. I think my aluminium will be OK considering they are only powering one channel so they will not be providing much current compared to a stereo set :)
 
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