Lm3886 passive bass boost

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lithoc

lithoc

Member
Joined 2005
Hi,

I've downloaded the Overture Design Guide xls file.

I'm trying to understand the negative feedback circuit.

Can someone elaborate the function of C3 & C4?
Which part of the circuit actually boosted the 30-70hz?

If let's say i need to boost higher(12db) and more bandwidth(30-100hz) , which component should I change?
Do I lower the gain by increasing the Ri to 2k ohm to get 12db+ bass boost?


According to the schematic, 30hz gain is 34db. From the design guide, I just do not get the correct value or something is missing in the circuit.


http://www.circuit-projects.com/cimg/LM3886_amplifier_schematic.gif


Thanks in advance
 
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