Thought I'd revive this thread as I've had a chance to mess around with this some more.
The best solution is if you can get a Rotron "Whisper"
fan, it will turn very slowly and can rarely be heard except in a silent room.
That's what I have - it's a real Rotron Whisper. It turns fairly quickly actually...I guess
it depends what one means by quickly. Yellow_Light_Colorz_PDT_08 I'm using it in my bedroom system and I
could hear it with music at moderate volume as it's pretty close to my bed.
Anyway - I decided to mess with the amount of capacitance and found that paralleling two
of the 0.47uf 630v caps (so 0.94uf total) and putting that in series did the trick. Works like a
charm and is much quieter. I took your advice and put them in one of those Radio Shack
project boxes...looks much better and runs nice and cool.
Thanks for the tip, Tom!