I have a question regarding a circuit I am making which I am hoping I don’t fry or cause to not work. So, I am building the strange orbits midi to gate module which is receiving midi signals fine when I hook up a module with an led to one of the pins of the arduino. However, when I connect the pins to the inputs of the TL074/84s I am using, I either get no signal whatsoever from any of the outputs or get one continuous signal. I am in a position where I can’t really make a lot of mistakes and can only work with what I have, I’ve tried swapping chips and have had similar results, and was wondering how necessary are the op amps to the circuit, do I really need them, or is if I go without them, what would happen or what can I expect? Can anyone help?
Are you powering the tl074 correctly with +/-12v, the circuit looks good, it’s only a voltage follower/buffer to protect the Arduino and provide a little more drive for the LEDs and output.
If you wanted you could replace the TL074 with some sort of non inverting hex buffer chip like a CD4050, six in a pdip device. Or the CD4504 which also provides level conversion so you could make your input side 5v and output +12v.
Yeah I tested the voltages to TL07/84 and they’re fine, but still having the same issues with different chips, and checking the wires I’m using. Can’t think of what can be the issue
Post a pic of your wiring please
Actually I did find out that swapping enough op amps, I found two that I needed and got the circuit working. But it got me wondering, the others I have are fine and seem to work for the most part, but have no idea why these specific two, even one caked with flux residue seem to only work, and both are tl074