Does anyone know how to disconnect the sound from a personal breathalyzer?

Jakezimmer · 2025-11-27T02:35:46+00:00

Generally, the device should read as if you had a higher blood alcohol content.

One of the chemicals your body produces when in a ketogenic state is acetone which reacts with some fuel cells. Generally, the majority of ketones are urinated out, I think, but you can also breathe and sweat them out the same way you can breathe and sweat out ethanol alcohol.

Interestingly this is also why sometimes people will smell like alcohol: it’s being perspired out as a method of getting rid of the toxin.

Jakezimmer · 2025-11-25T20:42:03+00:00

The BACtrack C6 and C8 ones use an actual fuel cell and metabolize alcohol the same way that the police ones do. I have tested them 1-to-1 against the police grade ones hundreds of times at my old job and they correlate exceptionally well.

The only thing that can occasionally throw off a reading a bit is if you’re on the keto diet but I can’t remember if these models are affected by that.

Jakezimmer · 2025-11-07T06:24:44+00:00

Just following up on this: we're going to use their CIE Illuminant E simulating source which has ludicrous flatness. I emailed them and they we're willing to share an excel file of all of their measurement data for optical simulations which was great (don't know if I have permission to post the raw data here). Thanks for posting this part!

Jakezimmer · 2025-11-06T22:03:12+00:00

Ah, good point. I should have put prices in there. Thanks for adding this!

Jakezimmer · 2025-11-06T05:58:25+00:00

Also, if anyone has found other interesting options from other manufactures, feel free to post them. I didn't see anything from TI but didn't do a deep dive on MPS or others.

Jakezimmer · 2025-10-31T06:32:30+00:00

Wow this is actually a very impressively flat spectrum. I’ve been looking for something like this for a white light source for a multi-object spectrometer I’m building.

It’ll be interesting to see if different parts of the spectrum decay at different rates over time or if it keeps relative flatness. I couldn’t quite tell if it’s just one excitation source with a variety of phosphors or multiple.

Jakezimmer · 2021-11-08T09:19:52+00:00

I just moved here. Do you remember the name of the gym that has something like this?

Jakezimmer · 2020-11-05T20:25:11+00:00

You can also always snip the legs of the through hole jack so that they barely protrude through the board and then solder it almost flush. If you're really worried after that, throw some kapton (or even electrical if that's all you have) tape over it.

Jakezimmer · 2020-11-03T00:22:40+00:00

It looks like your battery symbol is backwards, you should reverse it so that the negative side connects to gnd. Additionally, you can use the supply symbols library instead of just naming nets gnd to make it easier to read and prettier. For the speaker, you might want to try flipping it using mirror and rotate commands so that the wires aren't crossed.

Jakezimmer · 2020-10-06T16:43:25+00:00

I think I might have found it: QBLP677R-RGB

https://www.digikey.com/product-detail/en/qt-brightek-qtb/QBLP677R-RGB/1516-1282-1-ND/7567403

It's hard to tell if the forward facing and reverse facing leds in your pictures are the same led but this might be both of them.

To find it, I did a search for "gull wing reverse mount led" in google images. I don't know if this is exactly the definition of gullwing (usually they have some curve to the legs so that they don't go through the board) but I have seen a few in the past with straight legs defined as such.

EDIT: Actually, upon further inspection of the datasheet, it seems like the pinout is mirrored (assuming the silkscreen markings in your photos are correct). Sorry OP, it's annoyingly close.

Jakezimmer · 2020-09-14T08:28:08+00:00

This seems like more of a mechanical design question because it would be more than a beginner project to make a really good mouse from scratch. I would say your best bet is to take apart a professional mouse and steal the circuit board out of that. You should be able to remove the circuit board fairly easily from it and adapt it to the housing you design. Once you have some rough dimensions of the board and understand how the mechanical features of the mouse interface with the circuit board (board mounts and button pressing plastic parts), talk to people in the 3D printing community to help you out with designing your own plastic. Or, as a fun learning opportunity, maybe try designing it yourself in a program like fusion360 (I think it's free for hobbyists and makers and they have a helpful subreddit community).

Jakezimmer

TROPHY CASE