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I agree with what's been said. This box started out as one of those white breadboards and two pots. Then one encoder was added. Then I wired up the first perf board proto. It had an audio shield...

I'm not sure how much it helps but pictures of my test board are in post #115 of the Teensy 4.0 release thread. My board has sockets for the T4.0 and a T3.2 or T3.6. It is also dual footprint for the...

I built a Teensy audio playground breadboard that uses a T3.2, a T3.6, or a T4.0 and either a PJRC Audio Adaptor or Paul's CS42448 board. I used the 1.46 beta 5 code with the fix to the output I2S...

OK, I'm not so stupid after all, I just didn't dig deep enough into all the T4.0 stuff. In post #3913 of the Teensy 4.0 First Beta Test thread user El Supremo has the answer. I applied his fix and...

The three T4.0 boards I ordered arrived this morning. This is almost exactly 48 hours from ordering online to boards in the mailbox in "end of the dirt road West Virginia." Excellent service by PJRC,...

Yes, that thing. I have built two of them and have them working with a T3.4 and a T3.6. The end use will be in a music synthesizer that's part digital and part analog.

I dropped everything and ordered three of them when I got the email from Kickstarter saying BUY NOW!!!! Server struggling? It's dilithium crystals must have melted if everybody got that email at the...

Sure. The CS42448 board is the output for 6 audio channels created in the audio library. I have had good luck with the digital oscillators that I have been using. They are 1V/oct or MIDI controlled....

I bought three of these boards back when they came available. After sleeping on the shelf for nearly a couple of years, I grabbed one and set out to do my first SMD build in about 5 years. I can...

The original Push and the new Push 2 are both specifically designed to work with the Ableton Live DAW. Out of the box they will not even work on a PC and a different DAW. I know that there is a 3rd...

This is an issue inherent in the filter's design and has been discussed before:

https://forum.pjrc.com/threads/41314-Loud-white-noise-on-the-edge-of-filter

The only answer is to limit the...

1025710258I used these 858-P0915NEC15BR10K from Mouser in my two synth breadboards. The big one uses 8 to 1 multiplexing so that I can connect 49 pots to a T3.2 (now upgraded to a T3.6). The pots are...

WMXZ, thanks for the info. I downloaded DS two days ago and haven't had time to dig into it yet. The version I got was PCB 8.0. What was different about the DS7 business model, it's a free tool. If I...

I'm an equal opportunity amp builder. I started out tinkering with tubes in the 60's. You could get tubes and parts then for free, just by taking apart discarded TV's, radios, and HiFi sets. Over the...

luni, thanks for the input. I checked the Cadsoftusa / Autodesk web site hoping that I could use their "Eagle standard" version. It has a 160 cm2 total area restriction. The smallest board I make is...

I have been a loyal user of Eagle since DOS version 2.6 (around 1993). I have upgraded each year or so until version 5.11 which is what I an using today. Most of my PCB designs are for vacuum tube...

I haven't seen anything like those, but I tend to look for low $$$ options since I'm rather budget constrained right now and my synth currently has 53 knobs on it, with more in the works. The pots...

I got my RGB LED encoders from Sparkfun. They have a small clear plastic knob that goes with it. They are not bright enough to see outdoors but work good in a dimly lit room. ...

Portamento can be done two ways.

Portamento first appeared in the Voltage Controlled synths of the late 60's / early 70's. The synths of the day (MiniMoog, ARP Odyssey....) were monophonic lead...

You can stack two audio adapters on a single Teensy for 4 audio inputs at 16 / 44 and 4 audio outputs at 16 / 44. That gives you your 4 in 4 out. I have not tried it yet though, nor have I spent much...

OK, the Big Dumb Blonde One wasn't going to give up without at least blowing up some parts.......That usually only happens when I turn on the big power supplies and play with vacuum tubes, but that's...

I tried that, then added synthwaveform.md also. It breaks more than it fixes since it was built from an earlier version. Arbitrary and reverse sawtooth waveforms are not supported, so I commented...

I have the same issue in my synth. It's one of those nagging loose ends that I have not even had the time to look for yet. Filter freq knob too far to the right AND resonance knob too far to the left...

I don't know what caused the fried boards, but I see one common element here that can blow low voltage CMOS parts like the processor chip. These parts are rated for somewhere between 3 and 6 volts...

This shield is made to plug on top of a UNO. The Teensys are physically smaller than the UNO so the shield will not directly fit the Teensy. Some type of adapter, or maybe even straight wires would...

I explained my method of doing this here:

https://forum.pjrc.com/threads/32917-Controlling-oscillator-frequency-with-the-LFO-(Audiolibrary)?p=120592#post120592

It does require at least two...

I had a similar problem with a T3.2 and an audio adaptor connected by wires that were about 3 inches long. It seems that there can be some clock skew and cross coupling in those wires, especially...

There is also DesignSpark. Some people love it, some hate it. I have not tried it yet. I have been using the professional version of Eagle since the early 90's (DOS version 2.6). I needed the pro...

The Brain and the Brain Jr are PIC chip based devices that are already programmed for one specific function, MIDI controllers. They have a Windows based GUI application that sets up the function of...

That's one option, and one that I have used myself. It requires very little thinking, but you are limited to sending note on / off messages. Another "no think" method is to use a Brain Jr. From...

Any plans to do NBFM demodulation using 25 to 30 KHz channel spacing for VHF and UHF ham radio? If so I can design an RF front end for such use. I spent 41 years at Motorola designing two way radio...

The yellow wire is connected to the same pin on the optoisolator as the diode. Either the wire or the diode needs to be moved to the left one pin. I don't know which without looking up the circuit.

Analog pots are easy. One analog pin and an analogRead statement. Encoders require two digital pins each, three if the encoder has a push button and you want to use it. A software library is needed...

These are identical IC die (bare silicon) in two different packages. The packages involve two totally different processes likely designed and built in two different packaging houses. I worked for...

Yes, I feed the DAC the output of a waveform object. The DAC outputs an analog voltage through a pin on the Teensy which I use externally in some analog hardware. The output of this hardware does get...

I am not directly writing to the DACs. I connected each DAC output to a waveform object using the GUI in the audio library to create analog output LFO's (low frequency oscillators) for use elsewhere...

Does the DAC have similar restrictions? I am having weird things happen with the second DAC output while my full synth program is running. The main loop spends most of its time reading 48 pots, and 4...

The analog inputs are multiplexed through a switch matrix into two A/D converters. All of this takes place inside the chip. The converter will connect the selected input to an internal capacitor. The...

It doesn't have to be lower, it just works better in my synth with an upper limit around 10Khz. The filter changes the sound by removing the harmonic energy above it's cutoff frequency. The VCO's...

I have heard the filter hiss at me, but I never figured out what caused it. I had some scaling values wrong in the math that figures out things like freq and ADSR settings. All the funny sounds went...

I loaded up the "guitar" example with the output playing out the I2S port through the audio adapter. I set up two waveform objects to make the 150 Hz triangle and 200 Hz sine routed to the DACS...

A simple sketch with a pair of waveforms 200 Hz sine, 150 Hz triangle, each wired to one of the inputs to DACS and the same input on I2S works fine. I get the proper tone in the headphones (I2S) and...

My synthesizer uses the audio shield for audio output. I have been using DAC0 for an LFO output. I replaced the two separate DAC instances with the new DACS object. The sketch compiles and runs. DAC0...

Attempting to simply add a second DAC compiles and uploads to a T3.6, but the sketch does not run in the target device. I will experiment further tonight.

Yes. DC object set to an amplitude of 1 goes into envelope, then envelope goes into filter frequency mod in. I also have a mixer object between the envelope and the filter so control the sweep range....

I don't know if you have encoders yet, but these guys are on sale again. They work well with the T3.2 and T3.6 using the built in encoder library. Ground the middle pin, connect each outer pin to the...

I am using the audio shield for audio output and audio input. The DAC is for LFO.

I would assume that the same method could be used to numerically modulate the waveform generators. It would be...

I have FM modulation of all of the waveforms working in my synth. I wanted my synth to be compatible with the 1V/oct standard used in most modular stuff so I spent nearly forever figuring out how to...

It may be possible to do what you ask, but there are some stumbling blocks you need to understand.

Depending on the audio quality that you are looking for the internal D/A's and A/D's may not be...

You can record audio from the on chip A/D but you will not get 16 bit quality. You get more like 12 to 14 bits depending on how you interface it and how it is multiplexed. Best results come when...