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Old 28th September 2003, 07:03 PM   #1
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Default 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.
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Old 29th September 2003, 04:26 AM   #2
djk is online now djk
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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.
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Old 29th September 2003, 05:46 AM   #3
subwo1 is offline subwo1  United States
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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.
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