Focusrite scarlett 2i2 1st gen12/28/2022 I hope reprogramming is not require as you said, it will make it possible to fix. So thank you for clear me up on exact part number. Arrives by Fri, Dec 3 Buy OMNIHIL (32FT) 2.0 High Speed USB Cable for Focusrite Scarlett 2i2 (1st GENERATION) USB Recording Audio Interface at. * I bought USB3343 from RS, it should be genuine one *Īnother odd thing is, mine XMOS has no any marking other than XMOS name, wafer number, and lot code. So I still has no idea if XMOS chip is really a root cause or not or I mess something up then it sum up to be a big mess. But this time XMOS chip starting to get hot so fast. Diag) After remove USB chip, measured with result of no short at all. Now ULPI pin of USB chip shorted to groundģ. So I do plug USB in for diagnostic for long time then VDDIO pop!. Attempt) On second attempt with second chip, it react the same as computer will recognize for only 5 second or less then USB chip died again. Computer recognize the Scarlett but for only 5 second then USB chip died. Attempt) When I replace USB chip for the first time. So I though it would be USB chip about to die so I do try to replace it.ġ. Windows showed it unable to start because it door still opening. I think computer recognize it as disc drive or something. Here's what happened, one day Scarlett just gone unable to start. All pin got very high resistance (Over 1Megaohm) and around 0.9V diode-drop, no short at all. I already tried measure resistance and diode test on ULPI pin and it show that the ULPI seem to be fine. Thank you for reply and bring some more info and advice, yes I agreed that it's really odd. Sure, that would then also limit the maximum gain available, but at least in these usage cases, that wouldn't be an issue (no ribbon mics in use, nor terribly insensitive dynamic mics used on quiet sources). Through a bit of LTSpice simulation as well as messing with a couple resistor values, i managed to figure out that, by reducing the value of the 10k feedback resistors around each of the two halves of the NJM2122's, i could reduce the minimum gain there. With the above-mentioned resistor values, and the 20k gain potentiometer (which is actually a stereo 50k with the two sections wired in parallel), the minimum gain coming out of the NJM2122 is 2x. "R1" are 10k (R94, R98, R96 and R89 on the board), R2 are 30k (R58, R59, R60 and R61), and R3 are 13k (R80, R81, R82 and R83).Īll stock, with the gain controls at minimum, the input clipping indicators (red LEDs) come on when the input signal reaches around 3.6Vpp. The "Rgain" in the Wikipedia article is the gain adjustment potentiometer mounted on the top board, and accessible on the front panel, with a 470uF DC-blocking capacitor in series with it (to minimize the DC-offset on the outputs), as well as a 33 ohm resistor (to limit the maximum gain). The third opamp is one half of an NJM4565 (U18 in this case). The NJM2122's in these preamps are wired as the two input opamps in a three-opamp instrumentation amplifier.
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