Software engineer at the Nucleic Acid Observatory in Boston. Speaking for myself unless I say otherwise.
jefftk
Karma: 18,942
Breadboarding a Whistle Synth
Electronic Harp Mandolin Prototype
Contra Chord Simplification
Events Booking New Callers?
Backyard Office
Spending Update 2024
Four Local Gigs
Clipboard Filtering
Turns out I forgot to solder the ground and power pins! So they worked, but very poorly.
Combined with switching to shielded cable and swapping the piezo input from +1.65v to ground, it’s working well now!
Text Posts from the Kids Group: 2020
Interference Issues
Pandemic Identification Simulator
Trying to Do More Good
BIDA Election Thoughts
I did decide to redo it for the Teensy 4.1, and I hooked up all 18 inputs:
I also added mounting holes, and a bit of writing.
When you get deeper in you will hit the issue that almost every modern part is smd with no through hole equivalent.
I’m not currently planning to get deeper into this, but we’ll see!
Audio science review forums will have domain experts who are much more knowledgeable than I am about this, it’s very hard to make “perfect” analog acoustic circuits where any design compromises are no longer audible. But it can be done.
One nice thing about this project is that I’m not trying to capture high-quality audio: I only need it to be good enough to work as a sensor.
Testing with a breadboard the 3.3v digital seems to be good enough, and the noise I’m getting seems to be RF on the piezo lines which is hard to avoid.
Note that if you have a hot air soldering iron and paste it’s not difficult to use smd parts of you order the big ones or have a microscope.
I don’t, and haven’t used one. I suspect it’s not worth getting into it for this project?
I silkscreened the actual values not “r1...rn” and the same for capacitance. This makes hand building easier.
My current draft (as pictured here) does both, which is the KiCad default.
Whoops! You’re right! Will do.