BYacey
Well-known member
Has anyone experimented with A PWM power amp? seems to me this would be an efficient source of power to run subwoofers.
Class D power amps
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NewYorkDave
Well-known member
That technology has been used in commercial products for years.
High power car audio amps and Crown's K-series come to mind.
High power car audio amps and Crown's K-series come to mind.
robomatique
Well-known member
I just received two ready built class-d modules from lcaudio in denmark. Haven't built them yet but here is info:
http://www.lcaudio.com/
Hypex also makes two modules that is a bit cheaper:
http://www.hypex.nl/
There is discussion about these at this forum under the class-d section:
http://www.diyaudio.com
Robert
http://www.lcaudio.com/
Hypex also makes two modules that is a bit cheaper:
http://www.hypex.nl/
There is discussion about these at this forum under the class-d section:
http://www.diyaudio.com
Robert
I made a prototype for a subwoofer and it required only 5 major components :
one HIP4080 (the MOS driver) and 4 IRF520 (power MOSFET).
Then you add a few resistors, small caps to set switching frequency, dead time, etc ... and most important (and harder to get) : a big fully protected power supply !!
I had some sound coming from my speaker with my own model.
Depending on your output speaker, you maybe won't need any output filter but it's HIGHLY recommanded to use one.
Be careful with the HIP4080 : it gets killed quiet easily. The biggest error I made was to connect my incoming signal directly into its input. It requires a coupling-capacitor on its input.
But if you read carefuly the datasheet (not like me :wink: ) you shouldn't have any problem.
Finally, you can get the HIP4080 and IRF520 for free as sample products irectly to the manufacturer.
one HIP4080 (the MOS driver) and 4 IRF520 (power MOSFET).
Then you add a few resistors, small caps to set switching frequency, dead time, etc ... and most important (and harder to get) : a big fully protected power supply !!
I had some sound coming from my speaker with my own model.
Depending on your output speaker, you maybe won't need any output filter but it's HIGHLY recommanded to use one.
Be careful with the HIP4080 : it gets killed quiet easily. The biggest error I made was to connect my incoming signal directly into its input. It requires a coupling-capacitor on its input.
But if you read carefuly the datasheet (not like me :wink: ) you shouldn't have any problem.
Finally, you can get the HIP4080 and IRF520 for free as sample products irectly to the manufacturer.
SonsOfThunder
Well-known member
Like this?
http://www.cardomain.com/sku/KIC04KX25001
:thumb:
HIP4080 is commonly used in certain car amp brands. If you try to use them for power levels over 400W or so, they are not reliable at ALL.
The real key to class D amps is the output filter, but this is also the problem. Better filter (read "higher order") = less damping = sloppy bass.
HTH!
http://www.cardomain.com/sku/KIC04KX25001
:thumb:
HIP4080 is commonly used in certain car amp brands. If you try to use them for power levels over 400W or so, they are not reliable at ALL.
The real key to class D amps is the output filter, but this is also the problem. Better filter (read "higher order") = less damping = sloppy bass.
HTH!
