My subwoofer amp blew sometime ago. Happened on a freak hot day sometime ago. I think it reached 38C. I designed it for 25C ambient. ...oopss
The bridged amp modules probably blew.. It was a homebrew project. For something new... I'd like to try out a Class D IC and power it with a smps.
Any thoughts or recommendations on Class D amp modules for sub woofers? D from BC
A modest subwoofer amp has the output power of several hundred Wt. There are no ICs rated for that kind of power. There are many ICs for class D modulators (check Zetex website, for example). You will also need the external drivers to control the output high voltage high current FET stage.
Vladimir Vassilevsky DSP and Mixed Signal Consultant
Cool..25W/channel.. Available at digikey... and R and L can be bridged. D from BC
Thanks D from BC
Make it simple, omit the output filter at all. The inductance of a speaker is enough. A radio will be jammed anyway. Who cares about EMC ;-)
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
I make my own inductors.. I'll have to chose the correct core type and size for the Class D output filters. D from BC
TI does class D controllers rated at up to 300W, amongst others. I've used a couple of their lower power parts and they worked fine for me. I have no doubt other vendors parts perform as well.
One does need to be careful of the output filter parts, of course ;)
Cheers
PeteS
Hooray! ;-D
Cheers! Rich
I tried out my sub amp at full power one time. It rattled the wall pictures,cutlery in the kitchen drawers rattled, stuff fell off the shelves and the neighbors complained. Pretty good for just bridged 68W National modules. D from BC
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