H Bridge 'subwoofer' amplifiers

thylantyr · 28th September 2003, 07:03 PM

I'm collecting resources for H-bridge
amplifiers. Some car audio manufacturers
are using this type of design for their
subwoofer amplifiers.

If you have some resources or info,
can you post.

Generic schematic.
http://wwwlea.upb.de/Aktuelles/Proje...080A_Eval2.pdf

The selling point seems to be the single
rail suppy vs. dual rail to allow high
powered amplifiers in a smaller chassis,
but the output stage has 2x more
transistors, four vs. two of traditional
design.

djk · 29th September 2003, 04:26 AM

This is interesting:

http://164.195.100.11/netacgi/nph-Pa...&RS=PN/6304138

Considering that autos are going over to 42V power starting in 2004, a bridge amp will be able to deliver 400W/2R without an inverter.

A bridged pair of LM1875 driving TIP35/36 in the power supply leads would work.

subwo1 · 29th September 2003, 05:46 AM

I just posted a simulated design for this type of subwoofer amp I call the N-champ3.

The single power supply rail is really no big deal when using a switchmode power supply. With the SMPS, you can use less heavy duty parts in the power supply when using two rails, and you do not need to worry about problems with ground reference.

You can use only one power supply with any bridge amp as long as you make a virtual ground. But why bother when it is just easier to add the lower rail IMHO.
Take Care.

28th September 2003, 07:03 PM	#1
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	H Bridge 'subwoofer' amplifiers I'm collecting resources for H-bridge amplifiers. Some car audio manufacturers are using this type of design for their subwoofer amplifiers. If you have some resources or info, can you post. Generic schematic. http://wwwlea.upb.de/Aktuelles/Proje...080A_Eval2.pdf The selling point seems to be the single rail suppy vs. dual rail to allow high powered amplifiers in a smaller chassis, but the output stage has 2x more transistors, four vs. two of traditional design.

29th September 2003, 05:46 AM	#3
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	I just posted a simulated design for this type of subwoofer amp I call the N-champ3. The single power supply rail is really no big deal when using a switchmode power supply. With the SMPS, you can use less heavy duty parts in the power supply when using two rails, and you do not need to worry about problems with ground reference. You can use only one power supply with any bridge amp as long as you make a virtual ground. But why bother when it is just easier to add the lower rail IMHO. Take Care. __________________ USMPS http://groups.yahoo.com/group/switchmode/

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bridge-balanced amplifiers	lndm	Tubes / Valves	2	17th February 2011 05:20 PM
Subwoofer amplifiers in the uk?	sammydee	Subwoofers	20	17th June 2008 09:30 AM
My latest subwoofer - a bridge opa549 built onto a piece of plexiglass	soundNERD	Chip Amps	23	13th January 2005 07:56 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

29th September 2003, 04:26 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	This is interesting: http://164.195.100.11/netacgi/nph-Pa...&RS=PN/6304138 Considering that autos are going over to 42V power starting in 2004, a bridge amp will be able to deliver 400W/2R without an inverter. A bridged pair of LM1875 driving TIP35/36 in the power supply leads would work.