I have a circuit that implements a guitar amplifier (I ordered a couple LM386 but in the meantime I used an OP484). The following figure represents my schematic: (cap C2=10uF as well)
The signal from the guitar seems to amplify perfectly and without much noise when the speaker is not connected:
but as soon as I connect the speaker to the output of the amplifier the amplified voltage goes way down and the signal gets very distorted which sounds like a lot of humming noise, the clipped signal can be observed in the following image:
Any ideas why this might be happening? The only thing I can think of is maybe an impedance mismatch and if that is the case, how would I solve it? (the speaker data sheet says impedance is 8 Ohms)