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Hi - in that link it is the second circuit - with a different opt-isolator

https://diyelectromusic.files.wordpress.com/2021/02/diy-midi-receive-3.3v-v2_schem-1.png?w=1023&h=&zoom=2

Hi @Tombot7 - the Teensy 4 pins are not 5v tolerant, it looks like you are driving them to 5v which will likely cause damage. They are designed for 3.3v.

Either use a Teensy 3.x which can take 5v...

https://www.adafruit.com/product/4226 - might be of interest ?

The circuit will likely fix your feedback problem (without needing the filter).

What is the source that you are trying to connect ?

wow, that looks crazy - I want one!

@teensytwo - what sort of circuit are you using for the input?

I knew I had read about his somewhere, some useful real world testing detail (especially if you want to implement continue) in this link

If you get stuck there are still commercial products out...

Hi, cool that you have a CR 5000.

I'm not speaking from in-depth experience of doing this with teensy but a couple of points:
- Din sync just counts pulses (rather than frequency) - your myClock...

@luni, I used your code at #3 - it works great. I added a marker like you suggested for 'report available' and also one for 'report read' so you can see new crash reports. Thanks Paul.

@luni - thanks, our posts crossed - your solution looks much better (esp. the terminator). Cheers, Paul

Thanks @Defragster, that helps.

As a quick hack I've used StreamUtils to write it to EEPROM on restart and then read it out at leisure.

I don't think there is an end of report marker and the...

I'm trying to track an intermittent fault on a teensy (micromod) project that runs off USB for most of the time.

The fault only happens very occasionally, when it does it locks-up then auto...

my bad, 33R is the what i meant. cheers Paul

Yes, it is compatible with the AudioOutputI2S object



They look fine


I've alway connected them, can't imagine not connecting will be a problem but I've not tried that, perhaps someone with...

this link is about volume control but some approximations that might be of use to you.
cheers, Paul

Hi,

I'm not sure I fully understand what you are trying to do but a couple of points that might help.

if you are mixing 4 signals together you would normally have the gains set <1.0
- if...

I used the symbol and footprint @luni created (above)

good opportunity to say many thanks to @luni and confirm they worked out perfect.

Cheers, Paul

Hi,

That's great you're up and running. Couple of points:
- are you using the Audio library?
- you mix up I2C and I2S in the comment - is that deliberate (I2S and encoders)?
- on stability,...

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...

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...

4 SID chips sounds ace - would love to hear that if you’ve got anything on YouTube or Instagram?

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...

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...

@markT. The codec has 29k input impedance on the line in, would that not do ?

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...

@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...

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

also, the keypad library is very effective if you are looking for a ready baked solution

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

cheers Paul

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...

If usb c also make sure you connect cc1 and cc2 at the usb socket (to GND through 5.1k res). cheers Paul

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

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...

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...

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

zoomed in on usb and mm

26267

whole board

26268

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...

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...

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...

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

Cheers Paul

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...

@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

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 -...

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

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...

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...

Thanks all, got that Paul.

Posted question in usual way here.

Cheers, Paul

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).
...

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

* 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...

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...