B&WDM605 TDA7294V design

Sebastiaan · 28th June 2010, 07:51 PM

For those who are struggling with a bridged TDA7294 design, here a commercial product that works. You can download the rest of the service manual at the B&W website.

The bridged TDA7294 was used to actively drive the (sub)woofer section of the B&W DM605 S2 tower speaker. I heard this speaker myself, and the low end was mind blowing. This speaker never got a success sadly enough, and was soon discontinued.

The amplifier design is nothing exceptional, and the high resistor values all over in the circuit (due the inverted topology) bugs me a bit, and one can assure the noise floor is not as low as possible. Neither less, here a reliable and working circuit for those who need inspiration.

With kind regards,
Bas

Junior · 29th June 2010, 11:29 AM

not sure if my implementation is the same cos i had split the signal in via DRV134 to be feed into one pair of TDA7294. here is my implementation:

Sebastiaan · 29th June 2010, 02:41 PM

Quote:

Originally Posted by Junior

not sure if my implementation is the same cos i had split the signal in via DRV134 to be feed into one pair of TDA7294. here is my implementation:

Wow! congrats! very neat build, Impressive power supply. Mind to share some more? Schematics?

With kind regards,
Bas

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29th June 2010, 11:29 AM	#2
Junior diyAudio Member Join Date: Jun 2004 Location: Singapore	not sure if my implementation is the same cos i had split the signal in via DRV134 to be feed into one pair of TDA7294. here is my implementation:

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