Hi,
you could build two 50w to 60w into 8r amps using +-37Vdc.
If you bridge them you MAY be able to get 180w into 8r.
The problem to overcome to achieve this is current delivery from both amps.
Let me explain. A 50w/8r amp should be able to give 90w/4r if built with a good PSU and a very good output stage.
A bridged pair will then achieve double power into double the load impedance. Thus you get 180w/8r.
However a good rule of thumb for designing an amp and it's PSU is to ensure it can safely deliver full load into a load impedance about half the speaker load. For a conventional amp this equates to safe power into 4r, no problem usually. But for a bridged amp each output stage thinks it is driving a load that is half the value actually connected across the outputs. This requires both amps to be safe pushing 180w into 2r (non reactive). At peak voltage (28Vpk) it is delivering 14Apk and the PSU must hold up while allowing BOTH amps to use 14Apk each.
Simpler and cheaper to use +-50Vdc to meet your requirement.
you could build two 50w to 60w into 8r amps using +-37Vdc.
If you bridge them you MAY be able to get 180w into 8r.
The problem to overcome to achieve this is current delivery from both amps.
Let me explain. A 50w/8r amp should be able to give 90w/4r if built with a good PSU and a very good output stage.
A bridged pair will then achieve double power into double the load impedance. Thus you get 180w/8r.
However a good rule of thumb for designing an amp and it's PSU is to ensure it can safely deliver full load into a load impedance about half the speaker load. For a conventional amp this equates to safe power into 4r, no problem usually. But for a bridged amp each output stage thinks it is driving a load that is half the value actually connected across the outputs. This requires both amps to be safe pushing 180w into 2r (non reactive). At peak voltage (28Vpk) it is delivering 14Apk and the PSU must hold up while allowing BOTH amps to use 14Apk each.
Simpler and cheaper to use +-50Vdc to meet your requirement.
try this class d 2 chips solution by national
http://cache.national.com/ds/LM/LM4651.pdf
or Elliott Sound Products sw amps
http://sound.westhost.com/project68.htm
or also thi s for bridging
http://sound.westhost.com/project3a.htm
good luck..
ciao e buon lavoro.
Eugenio
http://cache.national.com/ds/LM/LM4651.pdf
or Elliott Sound Products sw amps
http://sound.westhost.com/project68.htm
or also thi s for bridging
http://sound.westhost.com/project3a.htm
good luck..
ciao e buon lavoro.
Eugenio
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