I'm trying to build a simple amplifier for my guitar. I created the exact same circuit as a common-source amplifier, I biased it on the necessary Q-point, and AC signals are decoupled.
It worked nicely; I get the amplified guitar output on my osilloscope. The output signal was really satisfying, I get 2 to 10 V Vmax, depending on which guitar string is oscillating.
But the problem is that the output signal disappears when I connect a speaker to the circuit. By "disappear" I mean that the signal gets very low and the speaker isn't being driven. When I put my ear on the speaker and play something on the guitar I get a distorted guitar sound which is pretty low-volume, and I can barely hear it.
I connected the speaker right after the coupling capacitor on the drain point. I also tried to connect a 1 MΩ resistor in series with the capacitor and then connected the speaker in parallel with the resistor, but still could't get any results.
What should I do to get my speaker to be driven?
My circuit is like this (when I add a source resistor, the signal also disappears. It doesn't matter if I add the capacitor between source and ground):