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  1. Hi, They share the same clock so connect BCLK...

    Hi,

    They share the same clock so connect BCLK & LRCLK on both WM8731s to 21 ad 20 on the Teensy.

    Your I2S_2_TX & RX don't look right, the correct pins at the teensy end are in the comments...
  2. The test board was really just getting two...

    The test board was really just getting two WM8731s working together. I've been using that codec in a project to recreate an old vintage effect unit (some details on Instagram if interested).

    For...
  3. 4 SID chips sounds ace - would love to hear that...

    4 SID chips sounds ace - would love to hear that if you’ve got anything on YouTube or Instagram?
  4. Hi MrC I use two WM8731s for an audio...

    Hi MrC

    I use two WM8731s for an audio project, you'd have an extra 2 outs ( 4in and 4 out) but the chips are reasonably available and come in SSOP so easy to solder by hand. They are also...
  5. Ok, see why you want the buffer. The circuit...

    Ok, see why you want the buffer.
    The circuit you have is biasing the op amp at 4.5v which will be no use for the audio board - I’d remove r3 to remove that bias and it should be fine.

    The other...
  6. @markT. The codec has 29k input impedance on the...

    @markT. The codec has 29k input impedance on the line in, would that not do ?
  7. hi - I might have missed the point here but you...

    hi - I might have missed the point here but you should just be able to plug the synth jack straight into the audio board line in i.e. bypass the circuit you have above and just connect the jack input...
  8. @rvh - don't know if it's any help but I ported a...

    @rvh - don't know if it's any help but I ported a mutable instrument sample rate reducer effect, does a nice smooth effect all the way down. It's just an effect so doesn't actually change the sample...
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    Hi - in this picture you are one row out - don't...

    Hi - in this picture you are one row out - don't solder them up like this.

    you need to align the first row of pins on the teensy with the first row of pins on the shield
    cheers paul
  10. Thread: 24 Keys Matrix

    by houtson
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    also, the keypad library...

    also, the keypad library is very effective if you are looking for a ready baked solution
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    I do something similar in this post...

    I do something similar in this post, not with a T4.0 but a T4 micro mod and 2xWM8731

    cheers Paul
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    On my board I use BATT_VIN/3 as a general IO and...

    On my board I use BATT_VIN/3 as a general IO and all seems to work fine (including the other analogue inputs). I'm fairly sure as KurtE says it's just intended for battery level monitoring as part of...
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    If usb c also make sure you connect cc1 and cc2...

    If usb c also make sure you connect cc1 and cc2 at the usb socket (to GND through 5.1k res). cheers Paul
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    No. You need to give the MM 3v3 from your...

    No.
    You need to give the MM 3v3 from your carrier board but for the USB to work you also need to connect USB_VIN.
    Sorry if it wasn't clear.
    Cheers, Paul
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    Success! It was that I hadn't connected USB...

    Success!

    It was that I hadn't connected USB VIN to pin 9 on the mm connector - I was using it to convert to 3v3 but I didn't connect it direct to the MM thinking it's 5v and teensy 4 doesn't like...
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    Thanks I'll have a check on voltage and current...

    Thanks I'll have a check on voltage and current levels, good idea.

    I'm just using a small 3v3 ldo and was thinking I'd get something larger for next rev. Teensy is running quite happily and doing...
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    Thanks for having a look at it - it's a usb c...

    Thanks for having a look at it - it's a usb c connector.

    zoomed in on usb and mm

    26267

    whole board

    26268
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    MicroMod Teensy Custom Carrier - USB Comms

    Hi, I've got stuck on this and think i might be missing something really basic on how to communicate with USB on Micro-Mod.

    I built a custom carrier for an audio effect project, powers up fine...
  19. Thread: Gate

    by houtson
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    I made a quick modification to run on Teensy 4.x...

    I made a quick modification to run on Teensy 4.x

    I'm using it as part of a gated reverb so wanted something slightly different from it so it now has two inputs:
    - input 0 is the main audio input...
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    Hi Something else to look at is that the...

    Hi

    Something else to look at is that the loop() function will be executing at a very high rate (millions of times a second).

    You'll be continuously re-starting the effect (.begin) and...
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    Another thank-you from me really helpful sorting...

    Another thank-you from me really helpful sorting out a question I had

    Cheers Paul
  22. Answering my own question here but might be...

    Answering my own question here but might be interesting to someone coming behind....

    To confirm, the MicroMod has all the pins exposed to run 4 channels in and out no problem using the standard...
  23. @grinch - there is also a schematic of the Teensy...

    @grinch - there is also a schematic of the Teensy 4 board here put there by another user along with kicad files, it may be useful.
    cheers, Paul
  24. Hi @dimitre In the example it is a circular...

    Hi @dimitre

    In the example it is a circular buffer designed to process a continuous stream of audio so when it gets to the end it just wraps around to the start again.

    In this example -...
  25. Hi Oscar, you could check out TyCommander...

    Hi Oscar,

    you could check out TyCommander I haven't used it with multiple Teensys and PlatformIO but other seem to have had success with it

    Cheers, Paul
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    hi @torché, I had a similar issue and concern,...

    hi @torché,

    I had a similar issue and concern, I ended up using a different codec (a wm8731) as although still SMD it's an easier package to hand solder.

    Some details in this thread...
  27. Hi, I've not used PSRAM but from what I...

    Hi,

    I've not used PSRAM but from what I understand that approach with EXTMEM should work.

    As long as you are not looking to 'save' you loops that approach with an array sounds good.

    It...
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    Thanks all, got that Paul. Posted question in...

    Thanks all, got that Paul.

    Posted question in usual way here.

    Cheers, Paul
  29. MicroMod Teensy - 4 Channel Audio / Custom Carrier

    Hi

    I want to use the MicroMod Teensy on an audio project. I've got it in the ATP carrier at the moment but planning a custom carrier with codecs for 4 output channel sound (only need 1 input).
    ...
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    MicroMod Teensy - help / issues etc

    What's the etiquette on T4 MicroMod questions / issues etc. - ok to ask here on the PJRC forum or is there somewhere in Sparkfun-land that should be using?

    Cheers Paul
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    * more to last - I believe WAV file player and...

    * more to last - I believe WAV file player and FFT will also fail at 16 sample per block.

    Also@jonathan's advice to try it, see if latency is too much and if so reduce the block size is a good...
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    I use AUDIO_BLOCK_SAMPLES of 16 for effects to...

    I use AUDIO_BLOCK_SAMPLES of 16 for effects to keep latency low. At that block size the only object I've found not to work is the USB audio out.

    I haven't been able to work out how to consistently...
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    Finally got a chance to check the video... Looks...

    Finally got a chance to check the video...
    Looks great ! A lot of work gone into that and sounds good, the front panel looks fantastic - love the real time controls.
    The serial data ports are...
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    Thanks @palmerr - sounds good, I'll have a go. I...

    Thanks @palmerr - sounds good, I'll have a go. I panicked and snagged a few off Mouser!
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    Anyone hand soldering these - are they ok to hard...

    Anyone hand soldering these - are they ok to hard solder?

    Been using WM8731 but need extra outputs and these look really good.
  36. Hi @jayshoe - thanks for those references. For...

    Hi @jayshoe - thanks for those references. For this use I don't need a balanced output just looking to lift the levels.

    If I was starting again and it wasn't for the chip shortage I'd probably use...
  37. T4 WM8731 Codec - Consumer v's Pro Line Level Output

    Hi

    Looking for a bit of help on what I hope is some basic audio electronics.

    I'm using a Teensy 4 with a WM8731 Codec (datasheet) in a custom effect unit.

    I'm using the line level out to...
  38. If there was a like button I'd press it - looks...

    If there was a like button I'd press it - looks great.
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    I don't know about any issues with A8 on a 4.1....

    I don't know about any issues with A8 on a 4.1. but if I'm using pots with a multiplexer (and switching quickly between pots) I get much better results without the caps on the pots.
    Cheers, Paul
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    Hi, i think it's operating as intended,...

    Hi,

    i think it's operating as intended, certainly the way I thought it operated i.e. once you have set a stage that is it set until you change it and the stage is independent of others.

    I've...
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    Sampler Rate Reducer Effect

    I ported the sample rate reducer by Emilie Gillet from Mutable Instruments Plaits (via a port to DaisySP by Ben Sergentanis) to a stand-alone Audio Library object.

    There's a basic sample rate...
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    thanks - void arm_q15_to_float (const q15_t *...

    thanks - void arm_q15_to_float (const q15_t * pSrc, float32_t * pDst, uint32_t blockSize )
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    Thanks I'll try that Is there and arm_...

    Thanks I'll try that

    Is there and arm_ function to convert a block of int16_t to float?

    I should have said above I'm using a teensy 4, cheers Paul
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    The tone attenuation is on the feedback leg of an...

    The tone attenuation is on the feedback leg of an old reverb effect that I don't own so difficult to isolate.

    I have the a schematic of it so believe it is as spec'd above, cheers Paul.
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    Quick bit of feedback to say I got that working -...

    Quick bit of feedback to say I got that working - thanks for the pointers @Blackaddr and @WMXZ.

    I'm a complete noob at filter design so I'll capture a few notes here for anyone else coming behind...
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    Maxim do a range of digipots that you can use for...

    Maxim do a range of digipots that you can use for this. Also Microchip MCP42050 is popular.

    Discussion on subject in another forum might be of interest.......
  47. Sounds fantastic, well done, I bet it's been a...

    Sounds fantastic, well done, I bet it's been a labour of love and a whole lot of effort.
    Industrial design looks great also with the case and the buttons (is that an injection moulded case?), I...
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    Thanks, came across this...

    Thanks, came across this http://users.sussex.ac.uk/~tafj0/DSP_IIR.html which looks handy

    Cheers Paul
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    Hi, thanks for the pointers The issue with...

    Hi, thanks for the pointers


    The issue with the library one is the noted issue with low corner freq (<400Hz).

    I'll have a look at the CMSIS-DSP, I'm assuming I'd need to wrap that in a new...
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    sounds good, let us known how you get on , cheers...

    sounds good, let us known how you get on , cheers Paul
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