Thundercat

on the subject of USB, please can we have proper pins to break out d+ and d-

Future Teensy with will USB-C. I can't discuss any other details at this time. I probably should not even write this message, but hopefully it at least answers this 1 simple question.

Excellent thoughts Tom. Thanks for the advice, wisdom, and the link. I really appreciate it. From the PCB picture it does not appear the housing is grounded (two large blobs on top and bottom of each pattern). In fact you can see they carefully...

From my limited understanding I would guess: That pattern on the underside acts as the capacitive touch sensor for each potentiometer / encoder. It seems that the housing of the encoders are not connected to ground or anything, right? In this...

Hi all, I'm keenly interested in creating a capacitive touch pot. I've settled on the Alpha endless potentiometers, RV112FF-40B1-15F-0B20, https://www.mouser.co.uk/ProductDetail/317-1240FF-15F-0B20K, and I know these have been used for this...

Excellent thank you 🙏 I have also found SK6805 RGB chips - with built in LEDs and just 2mm x 2mm. They claim to use 5mA constant current, although I can’t seem to find out if it’s 5mA total, or 5mA x 3 LEDs. Either way that would be a win...

A few more thoughts: You can get the WS2811 as single chips. These one are on the 12V LED strips, where one chip drives 3 RGB LEDs. https://www.adafruit.com/product/1378 I don't know if or how it would be possible to use them with low current...

This is one of those 'it depends' answers. If want to blast the lights at 100%, then you will need 1.8 amps to power 30 lights. Each RGB led consumes about 0.020 amps maximum, and there are 3 or 4 LEDs within an addressable pixel, so 30 * 3 *...

Thank you. That was my suspicion - and hence the question, are there any IC chips that can drive LEDs in a similar fashion...Finding low current LEDs isn't hard, but as you say the neopixel ones are married to their IC. Thanks Mark.

The neopixel chips define the output current, so the only way to get less bright ones is to find less efficient LEDs, not easy these days, and I'm not sure you can get the neopixel chips separately from an RGB LED package.

Thank you @TomChiron. That's a great idea. I guess I was concerned they would cut out completely - this happens on my other RGB LEDs if PWM duty cycle goes too low. Are you suggesting then that I do just that - use, say, 20 instead of 255...

There are some types of addressable LEDs also in different sizes. Adressing all 128 LEDs via one pin is handy and very quick. Why not use, e.g., 10% of power (or even less)? That is roughly the same as the mentioned 2mA per LED. WS2812 and...

Background: Hi all, been researching hours to try to find a way to incorporate a bunch of NeoPixels into a Teensy 4.1 project. Basically, I want to have a rotary encoder with 16 LEDs around it light up as the encoder turns, like you see on many...

Makes total sense. Thank you so much for your thoughtful response.

I think you might want to ask yourself a better question first: what is the maximal real resolution my faders can meaningfully deliver ? (maybe use a simple test jig and and i2c analog external multiplexer with high resolution ADC and/or a scope...

Thank you. Perhaps I'm not understanding responses, apologies, but I am asking if the Teensy hardware will support MIDI 2.0, which requires 16K steps for high resolution controls. My understanding is you can always interpolate/upscale 10-bit...

Thanks. It is my understanding the Teenys go to 12-bit resolution and are noisy at 12-bit, and work best at 10-bit. That's why I'm asking about it...

MIDI 1.0 already allows for up to 14-bit (2x 7bits) MSB/LSB resolution for many controls, I think that unless you need more than 16384 steps, that should be plenty for your fader hardware. You don't need to wait for MIDI 2.0 for that.

While waiting on response, I'm curious if the Teensy ADC will be able to support MIDI 2.0, or will an external higher resolution 14 or 16-bit ADC be required? I'm especially interested because I make fader products with the Teensy, and I'd love...

Hi everyone and @PaulStoffregen, any plan or roadmap yet?

Here's a version of it...PCB will need to be 0.6mm from all the reading I've done here.

Hi, I'm using a Teensy 4.1 and I've run out of pins! (Welcome to the club right?). I was going to MUX additional pins, but they will be used in a project with multiple LCD displays as the CS pins. My concern is the MUX delay may cause havoc with...

Thank you Nantonos. I read the blurb you shared - thank you. It seems this is suggested for the MIDI in jack however. Am I misreading it? Thanks, Mike

Hi Mark, thank you so much, yes that does help. Maybe I used the wrong term, but the MIDI cable shields can pick up radio frequency noise as you know and that's what I was referring to. It sounds like that's the way to go then...does anyone else...

@Thundercat: Not sure what you are referring to as "RF hash" (what would be the source of that, assuming you are talking about induced noise ??). In my current TeensyMIDIPolySynth (TMPS) project, I do, in fact, have MIDI OUT pin 2 connected to...

Hi all, I'm hooking a Teensy 4.1 up to a MIDI Out jack, 5-pin DIN, per this diagram from PJRC site: I have a rather basic, perhaps dumb, question. The circuit shows pin 2 connected to ground. Would this be the GND pin on the Teensy? I keep...

I'll post the last schematic after corrections; if by chance you can cast your expert eye to see if I made any other stupid mistakes I would be grateful. If not, it's OK, I think it's good. I also added a couple of test points for...

Thank you so much for the information and for doing the plots. I said it before, but again, do you ever sleep? I totally appreciate it and I'll consider X7Rs for future designs. Already this one is all fitting with the larger N0Gs, so I'll keep...

It is not that bad as it sounds. Understanding what the capacitor does and which parameters are critical allows to use the X7Rs without problems. They work in millions of devices. To test, i've picked up two 0603 caps made by muRata, both...

Wow, you weren't kidding - double sided board manufacturing is expensive! Imma have to rethink the connectors again... Redesigning again...

Hi @Pio, thank you again. Good catch on the net names shorting the resisors; corrected. I only put your name on because I wanted to give you credit, as you've been so generous, but I understand and have removed your name from the schematics...

Schematic: got last small changes: in the gain setting area I've moved the digital pot to the feedback loop of the opamp. This way the gain control will be linear with the correct range. Switched all decoupling caps to 0603 1uF to minimize the...

I updated my version of the schematic to include an R16 in parallel with R4: Sorry it's blurry but here's the whole thing again: I really appreciate your expertise and brilliance @Pio. I don't know KiCad well enough and I've been using...

One small thing: according to the simulation the max gain needed when the Expression Pedal pot is 10k is 11x. Right now U1 provides the 11x gain when the digital pot is fully shorted (1+(R4/R5)). In practice the digital pot will have some series...

OK @Pio, I have recreated your masterpiece in EasyEDA. I spent a long time trying to make the symbols the same as your great schematic, for clarity, plus I learned how to make parts with subparts. I hate to ask because you've already done so...

Very helpful thanks! It wasn't a new connection; lines were just connected a little differently. Thank you @Pio! I really appreciate it!

Latest schematic:

By the way @Pio is there any way for you to post your entire last version of the schematic with the newer part? I'm trying to proof my schematic but it looks like there's another connection on the last snippet you posted: Without seeing the...

Looks like it's the same part, different manufacturer. Should work fine.

Thanks. It has some slightly different specs, and I didn't understand the data sheets well enough to know if it would be OK. One has 3.6V minimum breakdown voltage; other is 3.8V, and other differences. Anyway I trust your judgement. Thank you...

Hi @Pio, I found this part: https://www.lcsc.com/product-detail/ESD-and-Surge-Protection-TVS-ESD_ElecSuper-PESD3V3L2BT-ES_C5180242.html Seems to have very similar specs and is already available in Easy EDA. Would this work too? There are many...

Totally awesome @Pio! Thank you so much for that, and I’ll definitely post pix of the finished boards, as well as troubleshooting, testing etc. Many thanks!! You are some kind of electronics genius! It’s great to meet someone generous and...

This way: It's a fun project, close to what i have been doing for the last ~30 years. Happy to help or just throw ideas in. Hope you will document it with nice pictures! :)

Thank you @Pio. I really appreciate your support and thoughts. For sure I'm going to stick with the more compact square layout now; the longer design isn't as easy to work with. I just didn't want to change the metal shell, but I went ahead and...

The built in zener diode is rated for 5V, with 3.3V it will work below the reverse breakdown voltage, maybe pulling a tiny current only. The two pairs of clamping diodes (instead of 2xBAT54S) will work. I'm trying to use parts available at LCSC...

Quick question, the surge protection part says operating voltage 5V. Will this work for the Teensy3.3V VCC? https://www.lcsc.com/datasheet/lcsc_datasheet_2412101038_UMW-Youtai-Semiconductor-Co---Ltd--USBLC6-2SC6_C2687116.pdf Thanks

Beautiful work @Pio. Thank you so much. I can't use a through-hole connector if I place it there due to the metal shell being in the way

There are dual footswitches with stereo TRS jack output, like the Hotone Ampero FS-1 Making one is also trivial. The dual jack ones would have to use an 2xTS -> TRS adapter. With the TRctrl signal low: Plugging a dual footswitch using a TRS...

@Pio just a question - I did't even know "dual footswitches" were a thing! Do you mean a single unit functioning with two switches, like this one: I'm not sure about this - would there then be two switches inside the unit, and in that case...

@Pio again wow you don’t sleep do you? Amazing. Can’t thank you enough for your brilliance here. Actually components on the bottom of the board are fine. There’s 3mm clearance between the bottom of the boards and the metal enclosure, and I...