New release and hidden feature revealed!

1/14/2019

The Multiwave Guitar Synthesizer

Today i'm releasing this new DIY project.

I've been playing around with the idea of creating other waveshapes then square waves for different sound possibilites. Saw and triangle is alot more challenging to produce out of a guitar signal, at least when doing it in an analog fashion.

The Multiwave is the result of alot of developing time. This is actually my third working design. The first one wasn't tracking that good and the second design needed an expensive chip (but actually had a perfect waveshape). So I finally settled with this version, which doesn't perform the best, but only uses common parts so anyone can build it without spending too much.

I hope you like it. :)

More info about the Multiwave Guitar Synth

The 1985 Guitar Synth hidden feature revealed...

The 1985 Guitar Synth was released in december, and I didn't reveal what the hidden feature was, but since so many people has asking for it - here's a video about it.

You could probably guess what it is just by looking at the video thumbnail. :)

Coding the hidden feature actually took alot of time. The actual guitar effect code took less then 10% of the program memory, but the tune itself took needed all the remaining space. I even had to cut down the track to make it fit.

I hope that you enjoy the novelty feature. :)

More info about 1985 Guitar Synth

I plan on releasing a few more "normal" pedals going forward, so stay tuned.
/ Fredrik

7 Comments

1/30/2019 11:23:43 pm

I found your site recently searching for CMOS oscillator breadboard info, (Im just starting to try simple oscillators on breadboard) and want to say thanks for those articles and explaining how some of those things work. Now Ive found your awesome pedal project demos too. What a bunch of cool stuff. Hope you keep at it.

Fredrik Lyxzén link

2/6/2019 05:50:04 am

Thank you. :)

Aisha link

4/11/2019 08:16:43 am

Hi Fredrik! Just out of curiosity, what is the expensive chip you are referring to for the MGS? Is it possible to use the expensive chip if one wanted to build it that way? For me, I don't mind a pricey chip if it performs well! Thank you for all of your wonderful DIY projects and circuits.

4/11/2019 04:37:20 pm

Hi Aisha!
The chip is a AD5220-BN100, a digital potentiometer. It's not really that expensive and it will used in the new deluxe/mega version of the MGS that i'm working on, for improved waveshapes. :)

The AD5220 has a simple interface, a clock input to "turn" the pot (it has 256 steps from each side) and an up/down input for selecting which direction the pot will turn. So it can be used without a microcontroller.

The idea is to set up the AD5220 as a voltage divider, and feed a square wave signal into the up/down select line, while multiplying the square wave frequency by 256 using a PLL, the multiplied frequency feeds into the AD5220 clock input. Which means that for every clock cycle, the pot will "turn" fully clockwise and back (in 256 steps) in a linear fashion, creating a perfect triangle waveshape at the wiper. I hope that makes sense haha.. :)

Thanks for commenting. :)

Aisha Loe link

4/12/2019 08:01:30 pm

Thanks for that detailed information! This is all incredibly intriguing. I can't wait to build these things, and use them in my recordings. I built a U-235 for my friend who is a violinist. We were getting absolutely HUGE bass sounds with that combination! The tracking is great. Again, I love your circuits and always find them so useful in making music.

Ilmu Komunikasi link

2/6/2023 08:35:34 pm

what signal does the guitar produce?

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