Hopefully this is the last ever post I have to make on this topic of op-amp and audio and whatnot. I've accepted my fate and I'm going to redesign my whole circuit board (I believe its got a cracked trace or something and I'm totally over debugging it).
For the most part (peak detectors, high / low pass filters) I'm happy with what I have. they use the good-old cheap LM358 and they work like a charm. (May be worth getting a chip that is only one channel to save having to do something with the un-used op-amp pins)
The main change is the audio bias and gain section of my board. What it does is it uses a LT1366 to bias the signal at +2.5 (and add a bit of amplification) and since it's rail-to-rail it can swing between 0 and 5V.
I was informed that the LT1366 is a very noisy op-amp. It is also overkill (because I over-complicated my circuit) and expensive for what I need.
What the whole board does is that it takes an audio signal and biases it at 2.5V (swings 0 - 5V). it then sends that signal through circuits like peak detectors. Then on the output of those circuits I use a voltage divider to now make it so the signal is at 1.75V (so now it now swings between 0 and 3.3V).
It's so totally over-complicated when I could just bias it at 1.75V in the first place. That also means I dont need a rail-to-rail op-amp.
The TLDR here is that I need an op-amp that is low noise, can support single supply and if it's not rail-to-tail it can at least support up to 3.3V out. It would also be nice if it had a Spice model.
I did some research and found the LMH6629 and SE5532AD8G. The LMH6629 is good because it's single channel and therefore I don't need to worry about the other channels. It seems like it would be a bit hard to find thought. Same goes for the SE5532AD8G.
I also looked at my old post and the MCP6002 / MCP6001 was mentioned. Although it's rail-to-rail, it is low noise and cheap (and has a Spice model).
It seems like a good choice but before I get too ahead of myself like I did last time, has anyone got any other good suggestions?
For the most part (peak detectors, high / low pass filters) I'm happy with what I have. they use the good-old cheap LM358 and they work like a charm. (May be worth getting a chip that is only one channel to save having to do something with the un-used op-amp pins)
The main change is the audio bias and gain section of my board. What it does is it uses a LT1366 to bias the signal at +2.5 (and add a bit of amplification) and since it's rail-to-rail it can swing between 0 and 5V.
I was informed that the LT1366 is a very noisy op-amp. It is also overkill (because I over-complicated my circuit) and expensive for what I need.
What the whole board does is that it takes an audio signal and biases it at 2.5V (swings 0 - 5V). it then sends that signal through circuits like peak detectors. Then on the output of those circuits I use a voltage divider to now make it so the signal is at 1.75V (so now it now swings between 0 and 3.3V).
It's so totally over-complicated when I could just bias it at 1.75V in the first place. That also means I dont need a rail-to-rail op-amp.
The TLDR here is that I need an op-amp that is low noise, can support single supply and if it's not rail-to-tail it can at least support up to 3.3V out. It would also be nice if it had a Spice model.
I did some research and found the LMH6629 and SE5532AD8G. The LMH6629 is good because it's single channel and therefore I don't need to worry about the other channels. It seems like it would be a bit hard to find thought. Same goes for the SE5532AD8G.
I also looked at my old post and the MCP6002 / MCP6001 was mentioned. Although it's rail-to-rail, it is low noise and cheap (and has a Spice model).
It seems like a good choice but before I get too ahead of myself like I did last time, has anyone got any other good suggestions?