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  1. Thread: Bat detector

    by palmerr
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    547
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    42,712

    Hi, This invitation came in my email this...

    Hi,

    This invitation came in my email this morning, and I thought that they may be dealing with some issues similar to your bat detector.
    ...
  2. Just a thought... If you do have problems with...

    Just a thought... If you do have problems with crosstalk, try a piece of tinfoil to go in the gap, laminated with a copper wire (bad metallurgy there, so keep it dry!) stretched across it and...
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    Great that you have found a key to your puzzle. ...

    Great that you have found a key to your puzzle.

    I'm surprised to learn that a C0G produced that kind of response, though I might have expected it from a standard MLCC. All the available info...
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    Sounds like you're getting close to a good place...

    Sounds like you're getting close to a good place with the filters.

    My Focusrite shares the same characteristics - moderate input output impedances & HP filters - and I've been caught before.
    ...
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    Here's my board layout for the CS42448 and the...

    Here's my board layout for the CS42448 and the bottom copper - you can see a U shaped audio groundplane, with the digital one under the Teensy and reaching down under the chip. The two groundplanes...
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    Sorry about the misunderstanding. Assuming the...

    Sorry about the misunderstanding.

    Assuming the vias are going to a ground plane, the input and output layouts look OK.

    What's the impedance of your source? It will add to the 150 ohms on the...
  7. Replies
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    I'm also working on a CS42448 board, however I've...

    I'm also working on a CS42448 board, however I've moved away from providing active input and output filters on the main board, due to parts count. Each 2 pole filter has around 9 components plus the...
  8. We'll be keen to see how it goes!

    We'll be keen to see how it goes!
  9. Many thanks. BCLK fixed now. Will republish...

    Many thanks. BCLK fixed now.

    Will republish in a few days after others have had a chance to comment.

    Hope to send of the boards for a prototype (board only) run for completion before Lunar New...
  10. I felt bad about saying the jumpers for T3 / T4...

    I felt bad about saying the jumpers for T3 / T4 could be a later addition.

    Updated schematics and layout attached, with T3/4 jumpers included.

    Please check my pinouts for both T3 & T4.
  11. Thanks for the bow tie suggestion - it's saved...

    Thanks for the bow tie suggestion - it's saved some real estate and allowed "normal" operation OOB on the inputs and outputs.

    While, I'm not trying for T3 / T4 compatibility on this iteration...
  12. Neat idea - I hadn't thought of using Teensy's...

    Neat idea - I hadn't thought of using Teensy's USB as ext pwr - simplifies that things a bit, and we're unlikely to get anywhere near the 1A limit (or even 500mA) of a phone charger.

    As for the...
  13. Thanks Mhelin for the commentary, I'll check...

    Thanks Mhelin for the commentary,

    I'll check the pinouts on the Teensy again. I must admit they are amongst the easiest things to fix - I've been concentrating on the audio ins and outs which are...
  14. As promised here is a first cut of the schematic...

    As promised here is a first cut of the schematic and broad layout.

    None of the components are optimised at this stage, and the decoupling caps are still sitting in a neat row at the bottom. Most...
  15. Gavin, Best wishes for your conversion...

    Gavin,

    Best wishes for your conversion project.

    I'm working on a T4 update to the CS42448 board at the moment, but it's still at the drawing board stage - and a topic of a separate stream in...
  16. Yes, the trade-offs in both BOM and board size...

    Yes, the trade-offs in both BOM and board size are important. I'm heading toward on board single pole filters, as the Audio Library's 16 bit depth gives a best case dynamic range of 78dB, and the...
  17. Yep, looks like someone else with sharper eyes...

    Yep, looks like someone else with sharper eyes picked up an issue I got wrong.


    Yes, unconnected inputs can create problems that are hard to track.


    Yes, there are multiple schools of thought...
  18. I have had a look at your schematics and the pin...

    I have had a look at your schematics and the pin assignments look fine (you've avoided the TX/RX assignment error on the published T4 Audio Board schematic).


    Having had a quick look at your...
  19. The discussion about the Eurorack requirements...

    The discussion about the Eurorack requirements has been enlightening - as I don't play on that side of the fence, and your bare-bones breakout board approach makes a lot of sense to allow for...
  20. useful thoughts. I'll definitely be sharing the...

    useful thoughts. I'll definitely be sharing the final product, rather than producing them to sell, and the modular approach, particularly for inputs makes sense. your "super long Teensy" approach...
  21. Paul, A further question - it appears from...

    Paul,

    A further question - it appears from tracing the Gerber file tracks on CS42446 OSHPark board, that the first of each pair of inputs goes to the tip of a 3.5 mm jack, whereas the first output...
  22. Yes, SMD can be a bit daunting. I'm currently...

    Yes, SMD can be a bit daunting.

    I'm currently working on a T4 rework of the CS42448 board, with better I/O filtering and I'm already up to 80 tiny little components and a 64pin LQFP to contend...
  23. I'm not quite sure what you're getting at with...

    I'm not quite sure what you're getting at with "HW configuration mode for the converters" - is it that some converters (e.g. CS5351) that could be used for adding extra channels via the the AUX...
  24. Paul, Thanks for the modular synth ideas. The...

    Paul,

    Thanks for the modular synth ideas. The overhead - extra supplies, DC coupling/offset, is probably more than I have real estate/energy for at this stage - at least to fully execute. What I...
  25. FYI, TDK has a daisy-chainable MEMS TDM...

    FYI,

    TDK has a daisy-chainable MEMS TDM microphone the ICS-52000 ($5 ea at Mouser).

    https://www.invensense.com/download-pdf/ics-52000-data-sheet/

    Up to 16 of them can be daisy-chained into a...
  26. Thanks for all the suggestions there - I'll...

    Thanks for all the suggestions there - I'll respond to a few of them, and bank the rest for future consideration.

    Writing the drivers is hard work, particularly when you need to ensure that they...
  27. CS42448 board update for T4 pinouts and improved performance

    Hi all,

    I'm starting work on an update to the CS42448 6 in/8 out board for the T4 pinouts - similar to the "Rev D" version of the SGTL5000 board Paul has recently published. It will go up on...
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    Hi, there are many suitable preamp modules...

    Hi,

    there are many suitable preamp modules available on eBay that will do the trick. most need a 12 v supply.

    The AD828 based ones might do the trick, as they will run on 5v. Beware, though...
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    Ethernet audio library ready to beta test

    Hi,

    I've been working on an Ethernet transport layer for the Audio library which is now ready for beta testing.

    https://github.com/palmerr23/EtherAudio - this repo only contains the...
  30. Soft limiter code available...

    If you want it, I have working soft limiter/compressor code that works on a T3.5.

    It is designed to drive an external gain cell, but the logic for hard and soft knees, gain ratios, attack and...
  31. Thanks. I hadn't thought of that approach - I...

    Thanks.

    I hadn't thought of that approach - I learnt my C in the late 70's (porting Unix kernels) and have had to add the ++ later in life, so I sometimes I miss something basic in OO.
  32. Using AudioStream::allocate() from AudioControl objects

    Hi,

    I'm working on an ethernet transport layer for the audio library - I have the basics working: input, output and control objects on T3.6 and T4.0 using Wiznet5500 modules. So far, I have tested...
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    I'll also have 3 spares of Paul's T4 BoB design...

    I'll also have 3 spares of Paul's T4 BoB design in a week or two - I ordered a run last week from China.
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    I've created an Eagle library with all the bottom...

    I've created an Eagle library with all the bottom pads in place.

    It's based on mng-25's.

    https://github.com/palmerr23/t4-eagle-full
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    bi-directional causes problems if you need...

    bi-directional causes problems if you need synchronised audio. even though the two clocks are crystal locked, they will drift over time. the usual solution is to use a master clock, usually generated...
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    here's another tip from the NXP community forum ....

    here's another tip from the NXP community forum . it's about an external SAI clocks on an iMXRT7D board, but might give you a lead.

    https://community.nxp.com/thread/480390
  37. Replies
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    Mike My bad - I used MCLK when I meant master...

    Mike

    My bad - I used MCLK when I meant master clock - which confused everything!

    There are a few hints in https://www.nxp.com/docs/en/application-note/AN12090.pdf but not enough to complete the...
  38. Replies
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    Mike Sorry I can't help with the clock timing,...

    Mike

    Sorry I can't help with the clock timing, but solving this problem will help with some other unresolved issues in the audio library/design tool - i.e. clock syncing with i2sslave. Have you...
  39. Replying to dslocum's post - that I can't see in...

    Replying to dslocum's post - that I can't see in this chain.

    The pin assignments are in the Adafruit_ILI9486_STM32.h file

    //Control pins |RS |CS |RST|
    #define TFT_CNTRL GPIOA
    #define...
  40. They're all in the Adafruit_GFX library.

    They're all in the Adafruit_GFX library.
  41. Replies
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    Paul, Seems to work OK. No need for "verbose"...

    Paul,

    Seems to work OK. No need for "verbose" to be on any more.

    Richard
  42. Replies
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    I've found that my 3.2 programs fine from the...

    I've found that my 3.2 programs fine from the Arduino IDE in Verbose mode under the new Win 10.

    Otherwise it needs to have a"button push".

    Considering the number of status requests generated...
  43. I'm not sure if you have solved your problem yet...

    I'm not sure if you have solved your problem yet with the 3.5" RPi screen.

    I have one and have it working.

    The chip is an ILI9486
    The interface is 16 bit serial - it resembles notro's circuit...
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    Egg on face. I had jumpers that were still...

    Egg on face.

    I had jumpers that were still tied together in an IDC cable - parasitics were causing the issue.

    Mischief managed.
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    To check my work, I ran the same code and...

    To check my work, I ran the same code and connections up on a T3.2.

    It worked fine (including with the I2S and patchcord code enabled) on the T3.2 but not on the T3.6

    Subtle differences?
  46. Replies
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    Audio WM8731 T3.6: I2S breaks I2C?

    Hi,

    I'm setting up an open music labs audio board (WM8731) with a T3.6

    Assuming the audio library uses I2S (WM8731 as slave) & I2C0 I have connected to the default pins for both.

    I2S: SCK...
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    I'm sorry, but the details of the board you want...

    I'm sorry, but the details of the board you want to use with a Teensy didn't come through with your post.

    I can't see an earlier post in this stream where you have given this information.
  48. Replies
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    Having had a look at the price of mikroBus boards...

    Having had a look at the price of mikroBus boards online (only MikroElectronika seem to make them, despite it being an open standard), I'm thinking I might spread the risk and bring it back to one...
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    Yep. I'll add a power LED. Still thinking...

    Yep.

    I'll add a power LED.

    Still thinking about the board service - perhaps PCBcart - $88AU for 10 boards. Probably 20-30% cheaper than OSHPark, but you have to wait for them to come from...
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    Thanks for the suggestions. Absolutely:...

    Thanks for the suggestions.

    Absolutely: different Serial#s for each mikrobus connector.

    I'll probably use SPI0 and SPI1 as SPI2 is accessible only via the pads on the back. I could use the...
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