In the Following pages I plan to describe how to design and build several mostly audio based projects. But for the time being all I will have is a amp based off of the LM3886 chip because I simply do not have the time to get everything out here. So if you like what you see come back later on I guess.
LM3886 Amplifier
If you know what you are doing in this please do scroll ahead...I'm just trying to create a detailed page like that I wish I had when I got into this. Everything is going to be simple and described to the best of my understanding. With a little algebra and some very very basic electronic knowledge, I hope after reading this page you will be able to build this amp.
So first off the LM3886 is made by National Semiconductor. The data sheet says that it is good for about 68watts rms, but this is completely dependent on your design. This chip is no power house, but for what I am doing it is fine, and for a first time amp its a good start in the right direction.
Design
I could just provide you with a schematic, but then you wouldn't really learn much if you didn't understand it and why the components have been chossen to be what they are. So if this interestes you, read the next section...
Here is the basic schematic for the LM3886.
This is the schematic that I used for my amp with the carious parts labeled so that i can describe each one in detail.
Ri&Rf1- Are the gain circuit of the amp circuit which follows the equation
Gain equals (Ri+Rf1)/Ri This equation is true for just about all opp amps...
Rf2&Cf- So now you ask what is Rf2 for...Well Cf and Rf2 work together to set the low end responce of the amp,and to keep out nasty speaker destroying DC. The whole point of this is that with the low end of the amp