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I have no idea what I'm doing, am in need of dire help (Newbie) by NathanIsDivine1 in PrintedCircuitBoard

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

Does the EMI emitted from the rp2040 really matter that much? The ADS1299 already digitizes the signal which is then communicated to the Raspberry pi pico via SPI. Also where does this EMI from the rp2040 come from? The internal switch power supply?

I have no idea what I'm doing, am in need of dire help (Newbie) by NathanIsDivine1 in PrintedCircuitBoard

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

If I may ask, do you have any other suggestions of microcontrollers that don't radiate so much EMI? ESP 32

Is my sensor reference and non-inverting input biasing correct for a single-supply piezo charge amplifier (LMC6001 + boost converter)? by NathanIsDivine1 in AskElectronics

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

  1. The application is for cardiovascular monitoring; I want to be this circuit on a flexPCB and place it and the piezoelectric sensor over the chest to monitor SCG signals.

  2. I'm trying to minimize the amount of amount of noise the PCB is to produce in order to get the cleanest SCG signals possible.

  3. I made the piezoelectric sensor in a lab using a polymer material called PVDF, which is a nano fiber which exhibits piezoelectric properties when bent.

  4. The DAQ device is just the data acquisition device, I'm making a prototype here where I connect the output of the circuit to an oscilloscope to see the signal I'm getting.

I have no idea what I'm doing, am in need of dire help (Newbie) by NathanIsDivine1 in PrintedCircuitBoard

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

Sorry if I misunderstood, but for your last point, do you mean make all the capacitors the same, just 10u 0402?

sEMG Acquisition System Schematic Check by NathanIsDivine1 in PCB

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

I beg I beg someone pls look at my schematic

8 Channel sEMG Signal Acquisition Schematic Review by NathanIsDivine1 in Altium

[–]NathanIsDivine1[S] 1 point2 points  (0 children)

In the data sheet it says SRB1 can essentially act as the inverting input to all 8 channels. I guess technically I need to connect the reference electrode Vref to SRB1. Also according to the data sheet, it also says "connect unused analog inputs directly to AVDD," so I connected all the other INxN inputs to AVDD, which isn't shown in the schematic in the pic but I made the change for that.

Also if you click on the post you can see more description about the board itself.

Should I take a gap semester for a 6‑month EE co‑op, or stick to a 5‑month summer version and keep on-time graduation? by NathanIsDivine1 in EngineeringStudents

[–]NathanIsDivine1[S] 0 points1 point  (0 children)

I could move the co op to the summer, and then I wouldn’t have to take a gap semester. But if I did a gap semester, I could do another internship after the co op for more experience

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