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  1. 1 MByte, yes, but NOT for the Acquisition DMA...

    1 MByte, yes, but NOT for the Acquisition DMA buffer, but for the SD write buffer.

    what I do is in principle:
    acquisition ISR copies data (chunks of 256 bytes, or so) to huge 200kB-uSD buffer (on...
  2. DMA buffer must only be aligned properly, but it...

    DMA buffer must only be aligned properly, but it can be anywhere in the RAM. Size is somewhat arbitrary. But buffer should not be accessed while DMA is writing to, so keeping DMA buffer to say 1kB is...
  3. @Yannick I'm not sure ADC will give you good...

    @Yannick
    I'm not sure ADC will give you good results without firm (soldered) contact.
    I would solder at least a header and use good jumper wire
  4. Error #1: never solder a Teensy if you can use a...

    Error #1: never solder a Teensy if you can use a breadboard. (OK this is void now)

    Suggestion :
    forget about DMA/SD and simply try to understand ADC (different modes, setups etc) This is easy...
  5. check if you can limit the output of your...

    check if you can limit the output of your field-amp to either 0-3V or +- 1.5V.
    if it is, say +- 12V, then, IMO, a simple voltage divider may be suitable.
  6. I may be wrong, but IMO you should first convert...

    I may be wrong, but IMO you should first convert the high impedance signal (high voltage-low current) into a low impedance signal (same voltage, but higher current) so you can sample the signal at...
  7. Ok, it seems you are only using an electrode (I...

    Ok, it seems you are only using an electrode (I used the term wire with the meaning conductor)
    But you need a potential difference to be measured, right?
    so where is the reference electrode?
    ...
  8. you never really said, how you pick up the EOD?...

    you never really said, how you pick up the EOD?
    not by putting a wire into the water?
    or did I miss some info?
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