I just tested my PDB's audio part, which is a "reflow" of Paul's Audio Board.
The Guitar sketch works (synthesis), line input, phones, lien out work.
The microphone works, but the sound is like the "phaser" guitar...
Also, please shout out if you know why you can't rely on a low-temperature paste for production.
The actual melting temperature of the paste is 137C. It's just the oven's lowest stock profile goes up to 180C, measured...
It worked! At least the parts I tested.
Got the first PCB with SMD parts in my life. All designed by myself.
Got a bare Teensy put some paste on the PCB, shoved them in the oven.
First time - too much paste, got...
Someone on another thread just mentioned that I can create dynamic object for the connections.
I always was thinking of Arduino as "build and run" concept. Make a bunch of objects in setup() and gently pad them in...
Thanks, Chip.
I see what you do there and it sounds good.
Still, I want to stay with the 'standard teensyduino'. Too many things to manage for now.
So much easier to ask someone else to do it (he-he)
I already submitted the enhancement request.
I think the static links cripple such a unique and powerful audio library that we have here.
I was waiting for something like this for years, while working on my...
Would be nice to be able to change source and destination of AudioConnections at runtime.
This way we can dynamically connect anything to anything instead of hard-wiring.
The change should be minimal: add copies of...
Thanks, @neurofun.
This is what I'm doing now. I wanted to let the users to arrange the effects in any sequence they want, so the number of all possible connections would be in a couple of hundreds.
I think this...
I'm making a guitar effect thingy based on Teensy 4 and I want the user to be able to select one or more effects and their sequence of processing.
I know some effects have a pass through mode and it's easy to add one...
Just tried this reflow oven (Happybuy Reflow Oven T962): https://www.amazon.com/gp/product/B01LZYEF90/ref=ppx_yo_dt_b_asin_image_o04_s00?ie=UTF8&psc=1
No modifications, just removed the masking tape and replaced with...
Thanks @ecurtz.
The oven arrives on Monday. I'll do all the modifications.
For the stencil, these guys offer it with the boards for $7: https://jlcpcb.com/
Each board will cost me $0.49
A week to get made and...
Finished KiCAD PCB today and found all parts on DigiKey for this.
Looks like something from Star Wars.
Teensy 4.0
Guitar input (preamp buffer)
Line in, out, phone out.
Bluetooth.
LiPo charger with load...
@ghostintranslation - don't be afraid of SMD. All you need is reading glasses and an iron with a small tip.
This is what I did to test op amp, with a chip similar to the limiter you need:
Also, there is a bunch of...
Hi Orhema,
Here is the USB host schematics:
Here is the PCB:
Install Teensyduino from here: https://www.pjrc.com/teensy/teensyduino.html
Look into this example: C:\Program Files...
Yeah, I know all this.
Can't wait a few months and i need it to be small, and with sd card on the same side as usb.
I think I'll just risk $20 and try it. Going to order the first Pcb next week and get the oven. I...
What will happen if I make a cutout in my PCB for the bottom components in the middle of T4 and use pads instead of the castellated cutouts?
Then I'll put it in one of these:...
Just found the answer: http://forum.pjrc.com/threads/49192-Adding-a-charging-circuit-to-a-project?highlight=load+sharing+charger
"Load sharing" is the key phrase.
@defragster
I was replying to this from @eegee:
"Hey Andy - it looks like from your pictures you added a 2nd USB connection for your keyboard - is that right? I’m hoping to just use the onboard usb connection for...
I didn't touch the jumper, so it's on 100mA now.
I just want to see what other people use. And I want the "Battery level" indicator with a pin on the charger.
@eegee - I don't know if the onboard usb can be a host. I did add a new host USB socket with a current limiter. I took it from this board:
https://www.pjrc.com/breakout-board-for-teensy-4-0/
scroll down to "Assembly...
Well, it's wired "by the recipe": cut the wire on Teensy, VUSB goes to the charger, the battery to VCC on Teensy.
I guess I know about the problems you describe, but I'm asking whether someone has a tested schematics...
I have this charger: https://www.adafruit.com/product/2124
It works fine if I wait for the battery to get fully charged. But if the battery is low and charging, the voltage on Teensy 3.3V output drops to about 2.5V and...
Wow, such a detailed answer, and from Paul himself! Thank you.
I'm sure many people here can use this information.
I'll trust your experience and will definitely mention your name.
Really hope I get to the...
Thanks, Static.
Show me Teensy 4 "surface mounted" with all bottom parts and holes soldered to proper (not router butchered) castellated cutouts and I'm all yours (he-he).
And I'm as serious as I can be, just need...
Well, I must say the news is not good so far. Did a little research and it doesn't look like I can be making profitable PCB's in the States.
Somebody, please, prove me wrong!!! I do want to make it here.
As it...
I'm getting close to finishing my design for a guitar effects board.
I wonder if anybody can recommend a good US-based manufacturer for PCB's.
I need it assembled, mostly SMD's, a few connectors, battery and a screen....
What's a "wrong aux-in"? Are you saying that the audio board can get smoked if its phone jack is plugged into some "wrong" amplifier?
The phone jack on my audio board just it just stays plugged into my active speakers....
I'm ready to make my new awesome electronic instrument.
I need to design a PCB, make a 3D model of it and design a plastic case for the PCB.
I tried KiCAD and rejected it because it doesn't move components with...
@KurtE, thanks for such a detailed response.
These are pretty expansive, indeed. I'm sure eBay will come to the rescue.
Also, I posted this question about CAP1188 on Adafruit forum:...
Thanks so much. This is what I was looking for. I'll try that, as I am in possession of a good analog oscilloscope.
But the screen and the sensors "sound" differently, so I may need 2 filters.
Thanks, Michael.
This is as affordable as it gets: $29 for each.
I still hope for the other people to do the tedious work for me (he-he).
Maybe I need to start looking for an alternative to Adafruit's CAP1188.
I...
I have added a guitar input to the Audio Board (rev. D). It's based on TS922 op amp.
I put a capacitor on the preamp output, 10uF was all I had, just before connecting it to the Line In of the Audio Board, in parallel...
Wow, that's advanced. I need to start learning about all this Logic Analyzer thingy. Which one do you use? Hope it's not too expansive.
My guess is that Teensy 4.0 is so much fast than anything out there, that we may...
Thanks, Kurt.
I have no idea how you figured it out, but that was the first half of the solution.
Addind the "delay(1);" in readRegister fixes the reading.
What I also found that it fixes the writing as well....
Just got the TS922 today: http://www.digikey.com/products/en?keywords=497-6035-1
Did my usual "wire mounted device" technique:
It is much more quiet than the LM358 and I think it just sounds better, don't know.
...
Ok. That concludes my research here. I didn't know about the high latency of A2DP. I guess it's good for playing musing, but not for something requiring latency below 10 msec.
I'm not giving up on that, just don't want...
Had no idea about this. Good to know. All I'm looking for is to save time digging around how to connect all this. I'm going to try it all anyway and see if it's good enough for an amature guitar player who wants a...
This is exactly what I need. I'm making a guitar "pedal" and want it to work as a wireless guitar transmitter, so that you can run around like young Eddie Van Halen. I'll use the Audio Board line out for that. Just need...
I have this crazy idea of having a bluetooth module connected to Teensy 4.0, which can stream sound from the Audio Board to bluetooth headphones or a sound system, and at the same time be connected to an Android phone,...
Tried to change the "if" like below. Still see the "?????" in the monitor. Don't understand how it can print "0x1" and fail to compare to it.
Anyway, I commented the "if" out and can see the touches, but they never go...
Yesterday I downloaded the latest of everything.
Checking now.
Adduino help says Adruino 1.8.10 and Teensyduino 1.48
The Adafruit library I downloaded today.
Sorry, forgot the connections and the monitor output.
I just thought that the fact that the I2C scanner finds all boards proves that the connections are good.
I use I2C on pins 18 and 19.
Here is the board:
...
Just got 3 of these: https://learn.adafruit.com/adafruit-cap1188-breakout/wiring
Put them on the breadboard, ran I2C scanner and says that it found all 3, but the Adafruit example says "CAP1188 not found".
I did try...
Found it:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHost_t36\examples\Serial\MIDI\InputFunctions
I just got the connector and the current limiter. Will try it this weekend.
Thank you.
I want to connect a MIDI keyboard to the USB host on Teensy 4.
Just can' t find any examples of reading from it.
If anybody has an example of reading data from the USB Host (D+/D-) port on Teensy 4.0, please send it...
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