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Type: Posts; User: bugi74

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    Search with "RS485 isolator"; the point is, there...

    Search with "RS485 isolator"; the point is, there are other types of isolation than optical. I.e. the opto-isolator can be replaced with something that requires much less driving current from the...
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    To avoid sinking current with pins, you can use a...

    To avoid sinking current with pins, you can use a driver IC, or suitable high-drive opamp, or, like the pin seems to be used to just pull down, drive a transistor with the pin, transistor driving...
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    And/or a buffer between filter output and device...

    And/or a buffer between filter output and device output to make the filter not affected by the input impedance of the next device. (Or could call it "driver", or even amplifier if it at the same time...
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    For the DC-blocking cap, the correct calculator...

    For the DC-blocking cap, the correct calculator is http://sim.okawa-denshi.jp/en/CRhikeisan.htm, but even that will not directly fit your case, since you have the RC-filter after the blocking cap,...
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    It has been quite a few years since I last time...

    It has been quite a few years since I last time did something with audio-frequency DC-blocking caps, but... that 10pF sounds small... very small.
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    Those 400, 200, 104, and 55 ohms seem to be for...

    Those 400, 200, 104, and 55 ohms seem to be for 1.8V setup, for the Rpu only?...
    Corresponding values for 3.3V nominal are 220, 110, 58 and 32... Still high..
    However, if looking at the "Data...
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    Or, if it is possible to wait for multiple cycles...

    Or, if it is possible to wait for multiple cycles of the input wave to calculate the period, then using timer/counters and averaging many results to get sub-count resolution. (That way one can do...
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    I meant this thing: 24646 I think the reason...

    I meant this thing:
    24646

    I think the reason is that the holes for the connector's case/frame are bigger than the through-hole legs, so it has room to shift before it gets soldered. And needs to...
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    I got similar weird back side cards yesterday. I...

    I got similar weird back side cards yesterday. I did recall some discussions about that info somewhere, so I just assumed I got some older stock or failed prints. (And these days, it seems that in...
  10. Clarification for Frank B's answer: not all X-bit...

    Clarification for Frank B's answer: not all X-bit CPUs use only X-bit instructions; some architectures have some shorter formats, and many 8-bit architectures have also at least some longer than...
  11. If there is a desire to have very fast (and...

    If there is a desire to have very fast (and accurate) response (1kHz sounds like these ultra-high rate joystick/mouse stuff), which requires the relatively high sampling rate, software averaging...
  12. Just "chained from input to input" might be...

    Just "chained from input to input" might be closer to correct description (and English is not my native, either, and thus, I can't pull out a better term). It is the "daisy" in front that has the...
  13. If I understood those diagrams right, none of...

    If I understood those diagrams right, none of that is daisy chaining, per se. They are just physically different ways to have the same logical connection.
    It might be about the quality of the clock...
  14. There are some devices that support daisy...

    There are some devices that support daisy chaining SPI communications (still with parallel clocking), but those should have their own documentation that explains the connections and protocols clearly...
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    My comments on the FETs were mainly a reply for...

    My comments on the FETs were mainly a reply for the "Please let me know if anything on it is confusing or looks incorrect."

    "Sluggish" is of course relative, but consider the difference of running...
  16. Can't really blame for that connection method...

    Can't really blame for that connection method when PJRC store itself shows similar examples on the product page :P (Though with better separation distances.)
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    That is one weird way to drive MOSFET gate, I...

    That is one weird way to drive MOSFET gate, I have never seen such example in any reference/datasheet/application note. Especially for a FET with somewhat usable Id even at Vgs 3.0V. That...
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    There could be a workaround: One could change...

    There could be a workaround:
    One could change the input waveform "manually" for the next period, basically applying an ultra-smooth gain slew right into the samples. That would require knowing the...
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    Most multimeters are incapable of showing the...

    Most multimeters are incapable of showing the kind of relatively high frequency noises that are likely the issue here. A typical ADC method they use is of integrating type, which in itself works as...
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    Yes, that is a way to get an extra bit....

    Yes, that is a way to get an extra bit. Theoretically.



    Hmm.. Considering that the DACs seem to be of the type with long series of resistors, its errors are mostly constant per input value...
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    Until one evening, tired enough, simply decide...

    Until one evening, tired enough, simply decide "enough of this noise" and stop for the night, forget to turn the volume down before pushing that virtual "off" button while the sounds still...
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    Wild guess here; the amplitude changes happen at...

    Wild guess here; the amplitude changes happen at a rate that matches the high pitch you hear... In which case the explanation would be that the amplitude change is done as a simple sudden step...
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    It depends; as mentioned by MarkT, PWM-based DACs...

    It depends; as mentioned by MarkT, PWM-based DACs can be very precise (as their output is mostly based on counting very precise ticks of time), which allows getting more resolution out of combining...
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    Theoretically, there could be tricks that allow...

    Theoretically, there could be tricks that allow improving the combined dual-DAC output resolution (to get some more effective bits, but not even close to the full 12+12), but it would require rather...
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    If the requirements are exactly that, 20kSPS,...

    If the requirements are exactly that, 20kSPS, -30dB at 10kHz, then it does not need to have a brickwall filter. Note, no requirements for the passband quality, so even a RC filter with suitable...
  26. I think that, in theory, on teensy 4.1 both the...

    I think that, in theory, on teensy 4.1 both the QSPI port (used for the extra PSRAM normally) and FlexIO port(s) could be set up for generic 4-lane SPI ("quad-SPI" or something). Considering that I...
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    No diode is to be connected to 0V or ground...

    No diode is to be connected to 0V or ground connections (in this case).

    Note that the guide's photo is made with Teensy 2.0, which has a 3 pad arrangement, where the center pad is (nominally) 5V...
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    I think he refers to this:...

    I think he refers to this: https://www.pjrc.com/teensy/external_power.html

    A simple "battery" in this case would mean 1.5V (nominal), in 4-series, and adapter would then refer to e.g....
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    Seems to me, by using the pins-mux pdf found by...

    Seems to me, by using the pins-mux pdf found by following the link "A larger, more detailed pinout chart" etc. (and the reference manual), that those CS-pins mentioned for the SPI1 (or LPSPI3 in the...
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    I am certainly not an expert on these things, but...

    I am certainly not an expert on these things, but I have been doing a deep (theoretical) dive on MCU based timing things before, and collected some (someone else's) ideas and points along the way....
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