SmashedTransistors

Back from the Synth Fest France where i presented the TR-I along with some othe Teensy based synths. I updated the code and added this core engine diagram to the github. Have an happy Easter.

Yes, that's my hope... especially coding time! I'm not ready to think about any new products until Sparkfun has been shipping Teensy 4.0 and Teensy 4.1 for a while. We've been pouring a lot of work into this transition for the last few months...

We are excited to announce the expansion of our partnership with SparkFun Electronics to include the manufacturing of all Teensy products. Teensy 4.0, Teensy 4.1 and related accessories will now be manufactured by SparkFun in Colorado, USA...

Well lookee here ... it's yet another Teensy-based synth ... or might be, if I ever finish it. But it says "Blog" in the category heading, so this may serve to stimulate discussion if nothing else, and if I'm moved to do so I can report progress...

VINIA has 8 channels, each one can be independently configured as a sample player, full synth voice, drum synth, harmonic oscillator, chord generator... or as a multi-effects unit for external audio processing. Easy to use constructor allows...

Regarding questions about the pins, the 100K resistor (R8) is meant to keep the USB host power off until software explicitly turns it on. Sorry, I don't have time to write a lengthy explanation about the pins, but you can find full documentation...

Hello... and have a nice Sunday I was able to solve the problem with MIDI. It was due to the query and configuration of the 16-bit frame buffer for the display. The frame buffer is part of the DMA memory in the Teensy4.1 CPU that controls the...

Mixer function

First sound on my Teensy Synth "Shruthi 2" Video: https://youtu.be/ffCMaR70G6g

Hi there... I am currently developing a new DIY synthesizer based on a Teensy 4.0 Boards. The synthesizer will look similar to the small Shruthi Synthesizer from Mutable Instruments. Compared to the Shruthi this synth will be polyphonic, have...

Hello, Synth Fest France will take place in France / Orvault (near Nantes) on 11, 12 and 13 April 2025. I have booked a booth there to present my Teensy4.1 and axoloti based DIY synths. I'll be glad to meet other Teensy builders there. This...

Next step is the Oscillator Mixer..

If power is from a USB cable, please know the USB 2.0 specification in section 7.2.4.1 "Inrush Current Limiting" on page 177 requires USB devices have no more than 10uF direct capacitive load. Teensy 4.x already has about 2.6uF directly...

To avoid inrush problems, i use the 5V from the usbHost on the Teensy4.1. I wait half a second before activating the usbHost. I use it like a controllable power rail. (Which is possible on the 4.1 but i don’t think it’s possible on the 4.0) I...

Sure, here is the filter circuit by itself. And here are the components from the BOM. If you use different components, keep in mind that low ESR is important. C1 C5 22uF CAP CER 22UF 25V X5R 490-12389-1-ND L1 10uH FIXED IND 10UH 1.2A...

Caveat, I am not calculating this, it is just a comment. You can decide if it is useful. For my instrumentation work, I always filter the 5v supply, inductor with a resistor and two caps, like this: And here is what it looks like assembled...

Hi, These class D amps inject terrible amount of noise in power rails. The are in fact very difficult to use. I say that, but I use them a lot, since they are so efficient ! I can get rid of the noise doing this : - try big cap (100 to 200uF) on...

Hi, I would encourage you to go with the "synth approach" as well. Could you tell us more ? - do you want to build a monophonic or polyphonic synth ? - what kind of keyboard do you use ? - do you want to add a lot of knobs and switches ? - do you...

Current envelope design... The blue dots are the active voices. There will be 6 controls for the envelope setting. Attack, decay, sustain, release, delay and curve. There will also be a loop function. The blue button can be used to select the...

Hello dear DIY friends.. I'm working on a new project called Degenerator 2. It's a polyphonic sampler and synthesizer based on Teensy 4.1 with 16MB sample ram and touchscreen. In 2011 I started developing my first monophonic sampler/synthesizer...

On alpha005 I added support for 2"42 SSD1309 based I2C OLEDS.

Hello, I added three little tutorial videos that explain how to use the Akai APC25 key Mk2 for direct control

Since the original Theramin heterodyned the oscillator controlled by the hand I believe you could set it to go either way too by choosing high or low local oscillator frequency. Or even to reduce in frequency on approach down to zero and start...

I will certainly add a switch to choose the orientation of the pitch. I have tested it quite a lot now, and it is really fun to play. There is of course room for improvements ! I have used a VL53L1X sensor to mesure distance. I appears to be a...

This is to announce a new instrumentation board for Teensy 4.x (and other Arduino type boards with SPI interfaces). This is an instrumentation amplifier input board that can provide high bandwidth measurements for a high impedance source. The...

"The input range is -4V to +4V" has no ambiguity.

Why not ! I didn't know about it. I will try to come.

Love the "scale mode". Great work! I restored a 1961 Moog Melodia Theremin for a friend. Quite the challenge to adjust all the tuning coils. Emulating with a Teensy opens up new territory to explore. BTW, most Theremin's increase the note...

I received my Teensy Audio Adaptor Saturday... I experimented with it today. I added the I2C SGTL5000 control to enable it and to set Volume to 1 (version alpha002). This Audio Adaptor sounds really great at 96kHz !

A short video showing FM oriented preset and control via MIDI program changes (without glitches).

Hi, This keyboard is a mini piano instrument with Teensy 4.1, 24 buttons, 4 potentiometers and a lot of additional adjustment power, as well as a Midi keyboard and speaker output with built-in SGTL5000 (via SD CARD). Each button has the ability...

This project turned out to be simpler and more fun than I thought. In a nutshell it is just an infrared frame (to get touch from a monitor) mounted on a piece of wood and connected via USB-Host to a Teensy 4. The Teensy 4 has some WS2812 LEDs and...

The project "Thierry-Rochebois-I" has been updated to alpha001 with 8 more presets and all "morphemes" implemented. https://github.com/SmashedTransistors/Thierry-Rochebois-I 8 voice polyphony 96kHz sample rate (for a brighter sound and...

DIY Teensy Arcade Synth | Tutorial & Presets Demo Teensy Arcade Synth on GitHub https://github.com/NickCulbertson/Teensy-Arcade-Synth Hey All! Using the Teensy Audio Library and Teensy 4.0, I built a 3-layer polyphonic synthesizer. The...

Great projects. Will you come to the Synfest France? It's a very friendly event where DiY enthusiasts like you and me are welcome. It is located near Nantes and is scheduled in april.