gainclone for sub

temp123456 · 19th December 2010, 07:47 AM

cant choose what chip to use for powering a subwoofer,i need 12v chip with very simple shematic,and to push about 50w(more-better) on 1 channel?
Any sugestions?

AndrewT · 19th December 2010, 04:56 PM

None !

12V single supply limits the output voltage to <4Vac (=11.3Vpp)
4Vac into 8r0 is ~2W
into 4r0 is ~4W
into 2r0 is ~8W
into 1r0 is getting silly.

temp123456 · 19th December 2010, 05:17 PM

how about 24v

AndrewT · 19th December 2010, 05:57 PM

do the sums.

linuxworks · 19th December 2010, 06:10 PM

dc to dc converters would raise your voltage (for the car, I assume)

temp123456 · 19th December 2010, 07:25 PM

i mean to use at home with pc psu which can give max 24v,so it should be something for me

temp123456 · 19th December 2010, 07:28 PM

Quote:

Originally Posted by AndrewT

None !

12V single supply limits the output voltage to <4Vac (=11.3Vpp)
4Vac into 8r0 is ~2W
into 4r0 is ~4W
into 2r0 is ~8W
into 1r0 is getting silly.

so the max power of 12v supply is 8w in 2ohm?? Í m confused

MJL21193 · 19th December 2010, 08:00 PM

Quote:

Originally Posted by temp123456

so the max power of 12v supply is 8w in 2ohm?? Í m confused

To increase the output power, you need to increase the voltage.
Convert 24DC to rms AC (best case) and you get ~8VAC (that's (V*.707)/2.
Power is calculated like this: P=Vrms^2/Rload.
P=64/Rload. If Rload is a 2 ohm speaker, it will deliver ~32 watts rms.

AndrewT · 20th December 2010, 08:47 AM

using your 24Vdc singe supply, you could build a balanced amplifier that would deliver double the power into double the load impedance.
Design your amps to drive 2ohm (reactive) load and you can get 64W into 4ohm.

This is quite a task to design and build some 32W into 2ohm amplifiers and then balance or bridge them.

temp123456 · 20th December 2010, 12:33 PM

how about getting 20w from 24v supply to power a 4ohm speaker?

19th December 2010, 07:47 AM	#1
temp123456 Account disabled at member's request Join Date: Dec 2008	gainclone for sub cant choose what chip to use for powering a subwoofer,i need 12v chip with very simple shematic,and to push about 50w(more-better) on 1 channel? Any sugestions?

19th December 2010, 04:56 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	None ! 12V single supply limits the output voltage to <4Vac (=11.3Vpp) 4Vac into 8r0 is ~2W into 4r0 is ~4W into 2r0 is ~8W into 1r0 is getting silly. __________________ regards Andrew T.

19th December 2010, 05:57 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	do the sums. __________________ regards Andrew T.

19th December 2010, 06:10 PM	#5
linuxworks diyAudio Member Join Date: Jul 2008 Location: santa clara, CA	dc to dc converters would raise your voltage (for the car, I assume) __________________ My Photostream:http://www.flickr.com/photos/linux-works/

20th December 2010, 08:47 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	using your 24Vdc singe supply, you could build a balanced amplifier that would deliver double the power into double the load impedance. Design your amps to drive 2ohm (reactive) load and you can get 64W into 4ohm. This is quite a task to design and build some 32W into 2ohm amplifiers and then balance or bridge them. __________________ regards Andrew T.


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19th December 2010, 05:17 PM	#3
temp123456 Account disabled at member's request Join Date: Dec 2008	how about 24v

19th December 2010, 07:25 PM	#6
temp123456 Account disabled at member's request Join Date: Dec 2008	i mean to use at home with pc psu which can give max 24v,so it should be something for me

20th December 2010, 12:33 PM	#10
temp123456 Account disabled at member's request Join Date: Dec 2008	how about getting 20w from 24v supply to power a 4ohm speaker?

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