Amplifier, generator and something else.
Although in a bit disassembled condition. Starting the first chip amplifier.
Although amount of details is enough to build a dozen of similar amplifiers (not exactly, there are only 5 operational amplifiers (ne5532) and only two main amplifier chips (lm3886)), I will build only one sound amplifier, generator (triangular and rectangular impulses) and will think about what to do with details after that. I have lots of ideas, but first I want to finish amplifier to get a little bit of experience. This reminds me how I started with linux kernel: read lots of mails and things looked like I know them, before I started practicing… I do not know it even now :)
It will be rather simple ampliier with two channels, one LM3886 chip per channel, and two buffer preamps. I have to admit, I got existing scheme from ixbt (in russian, link to IC image), since it has its characteristics already measures and shown good. Although I understood any detail in the scheme, and it looks similar to what was suggested in the datasheet, but still it is not mine. I read internet forums and found several simple extensions which will be used in the amp (like increased capacitors). Plus I will implement own power supply unit, which will be trivial though, since LM3886 can stabilize voltage itself: just a powerful transformator, diodes (I decided to use Schottky’s diodes and do not shunt them with small capacitors) and huge output capacitors.
I also booked and already read Bat’s book about amateur loudspeakers design and theory (С. Бать. “Любительские громкоговорители 3″ (S. Bat’, “Amateur loudspeakers 3″), and while again undestood how to design and implement loudspeakers, decided to first try to build something with existing prooved scheme. So I ordered 6 Visaton speakers to build something like its Clou system. Did not yet get wood though. Speakers will be delivered next week, although already it will be a bit different, since bass speakers will have 4 ohm resistance instead of 8 (there are no appropriate speakers in Russia yet).
Let’s see how all this will end up. I expect something extremely interesting. And now back to the drawing board to design some connection circuit for the amplifier.