"Nutcase ****ing ****"


So drop the 8A fuse (for 2 KWatt !) to what value ? and the 2 added
fuses of what rating ?


** Be very wary of adding +/- DC rail fues to any power amp designed
without them.

Very likely if one or other DC fuse blows or is removed, the amp's output
will swing fully to the rail with its fuse still intact.

Recipe for fried speakers.

You have been warned.



I'm just trying to engineer a more respectable equivalent of fuses for
trace
rupture.


** BULL**** !!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!



Eventually one DC rail ruptured as a fuse.


** BULL**** !!!!!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!


I've now decided to do some
calculation to determine what the rupture current for that trace was.


** BULL**** !!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!


Then as the common return almost fused and is the same dimension but in
the
even worse case then carries twice the current , halving this trace
rupture
current to use as the fuse rupture current and reduce that for current
carying capacity , by half again ?



** BULL**** !!!!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!



If all output trannies fused short circuit all round so loading both DC
rails the combined common return would have ruptured at whatever that
rupture current is for the trace that did burn up.


** BULL**** !!!!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!



Anyone know the term for laying double traces of solder along copper
traces
to increase current carrying , so I can research it ?


** That term is : ******** !!!!!!!!!!!


I'm intrigued how you lay quite accurate molten solder runs and parallel
over and with existing traces.


** YOU are intrigued with eating your own putrid faeces.


Anyway measurements:
Copper trace 3.5 x .02mm and as 2 half approximated elipses of solder then
area of 1 elipse of tin+lead which is Pi x a x b , a and b minor and major
axes of .15mm and .8mm.


** Where are the guys in white suits ???

Hope they have those tranquillisers jabs handy ...



From tables of fusing currents for copper, also tin and lead (NB in the
form
of circular wires ) for different diameters.


** BULL**** !!!!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!


Copper fusing current of the trace = 12 amps
Lead+Tin elipse then 6 amps (not as much as I would have intuitively
thought)


** BULL**** !!!!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!


Total 18 amps so 18/4 = 4.5 amps conventional fuse rating.
Presumably the circular to sheet allowance would up this 4.5 amp figure ,
but by how much ?


** BULL**** !!!!!!!!!!

You are a total ****ing nut case ASSHOLE !!!!!!!


Diverse Devices, Southampton, England


** Straight from the local schizophrenia ward to YOU !!!!!!!!


Usenet is the GREATEST lunatic magnet in the known universe.

Boy oh boy .............


- have we got ourselves a ****ing LIVE ONE !!



......... Phil