Hello,
I am starting to experiment with opamps as preamps, and/or headphone amps.
I am trying to add a tone control, and the big muff pi seems a simple one. I put it between the two op amps of a TL072CP but the sound I get is very bad. When there is not tone control, I get at least a clean sound when I listen with my headphones, but when I introduce the big muff pi tone control, the sound is noisy/distorted (in a unpleasant way). What I am looking for is a clean and filtered sound. If I want musical distortion I will add it later. But just to go step by step.
I have tried also to add the big muff pi passive tone control to the output of a JRC386D simple circuit, with just a capacitor at the output, and I get no sound at all. I am thinking if the output current of the opamp is not enough for the tone control circuit. When I remove it, I get sound in my headphones. I know that there is a circuit called Smash Drive that has a tone stack in the output of a LM386, but it is used as a pedal, and I have no tried and don't know if it has enough power the signal to drive headphones.
I am trying things with ingenuity, just step by step. Maybe some of you here have tried the same circuits or similar ones, or have more knowledge, and can give me some clues to help me get those circuits work.
Cheers,
Oscar.
I am starting to experiment with opamps as preamps, and/or headphone amps.
I am trying to add a tone control, and the big muff pi seems a simple one. I put it between the two op amps of a TL072CP but the sound I get is very bad. When there is not tone control, I get at least a clean sound when I listen with my headphones, but when I introduce the big muff pi tone control, the sound is noisy/distorted (in a unpleasant way). What I am looking for is a clean and filtered sound. If I want musical distortion I will add it later. But just to go step by step.
I have tried also to add the big muff pi passive tone control to the output of a JRC386D simple circuit, with just a capacitor at the output, and I get no sound at all. I am thinking if the output current of the opamp is not enough for the tone control circuit. When I remove it, I get sound in my headphones. I know that there is a circuit called Smash Drive that has a tone stack in the output of a LM386, but it is used as a pedal, and I have no tried and don't know if it has enough power the signal to drive headphones.
I am trying things with ingenuity, just step by step. Maybe some of you here have tried the same circuits or similar ones, or have more knowledge, and can give me some clues to help me get those circuits work.
Cheers,
Oscar.