Hi folks!
I have been pretty excited about the 1Wamp and decided I would try and assemble it myself to learn more about electronics. I have everything except for the required LM386 chip. Instead, I've got a few LM358s. I just can't figure out how to reconfigure the power amp stage!
Here's what I have so far
It seems the main difference between the two op-amps is that the 386 has pins dedicated to gain, while the 358 does not (I suspect that is because it's dual and restricts each op-amp to only 4 pins). So I designed an inverting configuration that depends on the feedback between the output and inverted input. I use a voltage splitter to bias my input voltage up to half my supply because this is a single power supply setup. I left out the aux input and power supply sections here, but they will exist in my final build.
I think my problem is the coupling capacitors - why is the output still biased after the capacitor?
Before this project I knew very little about electronics and how electricity actually flows, or even how capacitors worked. I'm looking to understand more so I appreciate any advice.
Thanks!
Matt