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LM1877 2.1 System Interfacing Summing Amp

andrew.grimm3

Dec 7, 2011
15
Joined
Dec 7, 2011
Messages
15
I need help calculating values for a 2.1 audio system using LM1877 IC's. I understand the 2w power output is not much but the design is what I need help with. I'm trying to drive a left and a right channel along and a channel to pass frequency's less than 250hz, using a summing amp to interface the left and right channels to provide the input's for the summing amp. About the only thing I know is how to get my gain value resistors for the left/right channels on the project. I picked a gain of about 20 to be pretty friendly. I need help with some of the design equations of how to solve down for my capacitor values and resistor values to only pass frequency's less than 250hz. Thanks
 

andrew.grimm3

Dec 7, 2011
15
Joined
Dec 7, 2011
Messages
15
Also I know the datasheet already solves out values but I'm not allowed to use them. What I need to know is what equations they used to get those values. All in all I need help with understand the design process of how the coupling caps and all electronics work in the system.
 
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