Electronics > Beginners
Building a sound mixer within my guitar amp with line IN & mic input
dazz:
Oh, one more question please. Is it OK to use a LM358 instead of the TL082? The reason is that the LM358 goes all the way down to 0V, so it seems to work for lower supply voltages without distorting.
The reason to pick the tl082 is noise, right? I'll put a socket to try both
Yansi:
358 is utter crap. For a test, you may try. But for a final application, hell no. I would not go less than NE5532. (TL07x may be also an acceptable choice, if 20V is all you have).
//this may not seem clear to a novice, but again, LM358 shall never be used for any audio applications, other than feeding a buzzer! LM324 the same applies (it is 2x LM358 inside anyway) //
dazz:
OK, I think I might have found one that should work for the final pcb version: LT6200
https://www.analog.com/media/en/technical-documentation/data-sheets/62001ff.pdf
Even less noise than the NE5532 at 0.95nV/√Hz, unity gain stable and rail to rail.
Yansi:
And who will pay for a 50pcs of $4 opamps for a mixing console?
And btw, it is just 12V maximum. That won't give you much headroom for signal processing.
None great expensive opamp will magically make the circuit work better, unless you know how to design it better*
Stick with the industry proven NE5532 or NJM4560/4580. They are good for the task.
*I mean for example, have you already studied how to optimize audio channel summing for noise performance? Using your LT6200 you may think will give you much better performance - it won't. The opamp is just 5x less noisy (14dB), but your overall summing node topology may influence the resulting noise by much more than that - in such case the LT6200 use just would not pay off.
dazz:
Well, I had no plans to commercialize it, but I see where you're coming from. I'll stick with the NE5532 then. In fact I already placed an order for a bunch of NE5534's
I have the datasheet here, looks like I need to figure out what those comp/balance pins do
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