hi all, i'm new here & i must say, this sight looks very helpfull so here goes:
for projects II i decided to build an amp with the tda1553q & LM1036 control IC.
The problem is that all works perfectly well EXCEPT the cooling fan, no matter how i connect it (running two transformers & two indepentand PSU's) it generates a humming noise based on the fan speed audible through the speakers. Now, when connecting it to a totally SEPERATE PSU, it's quiet... :roll:
i'm not too clued up on fan's & ac, back emf whatever it may be, so ANY help would be much appreciated
for projects II i decided to build an amp with the tda1553q & LM1036 control IC.
The problem is that all works perfectly well EXCEPT the cooling fan, no matter how i connect it (running two transformers & two indepentand PSU's) it generates a humming noise based on the fan speed audible through the speakers. Now, when connecting it to a totally SEPERATE PSU, it's quiet... :roll:
i'm not too clued up on fan's & ac, back emf whatever it may be, so ANY help would be much appreciated