csurgay
75d ago
Show HN: Online oscilloscope with waveform generators
csurgay.com
130
24
nathell
Ultimate test: can I plug in the audio from http://www.lofibucket.com/articles/oscilloscope_quake.html as a signal?
zoomablemind
Nice looks.

It's hard to figure out how to use the features other than just tweaking the generated waveforms.

How to measure anything?

Tried to use Mic as source, the whole thing gets unresponsive and needs a reload. It's in Firefox, Ubuntu.

Also, no sound output when Monitoring is On.

Here are some "discoveries":

- key C (calib) opens a test panel with additional buttons. Selecting Preset2 displays some funny figure. Other Presets are fun too.

- key F (frames) shows red bounding boxes on all controls

-key D (debug) shows some information in Developer console, then needs reload

P.S. Selecting Mic as source throws an exception:

"Uncaught TypeError: navigator.getUserMedia is not a function" in getUserAllow

AdamH12113
There's a lot of attention to detail here! I used to have a clunky analog oscilloscope and I see some subtle but important behaviors in the model like the bloom when the intensity is turned up. It seems that to control the knobs I'm supposed to click and drag up and down instead of side to side. Couldn't figure out how to get the FFT to show up, but everything else looks good.
diimdeep
See also

http://www.falstad.com/circuit/

https://cardinal.kx.studio

ilyt
Something's off with trigger, setting it to channel A when both channels generators run at different frequency should make the second channel waveform "float" as it is unsynchronized. Normally those 2 channel scopes have per-channel trigger source

Here is how mine looks: https://i.imgur.com/TunVxDm.jpg

peter_retief
Is it possible to use probes?
David_Axelrod
I thought it was neat until I pressed the "Preset" button on the left. Do yourself a favor and try it.
chaosprint
Interesting. It can play the waveform! Where can I see the source code?

I have a small demo for Sine Wave Scope made with WebGPU here:

https://stackblitz.com/edit/vitejs-vite-cuc9vs?file=main.js

theamk
why is this so stationary? I had worked with real oscilloscopes, and it's always tricky to get a steady picture, especially on the old analog ones. But here, no matter what I do, the picture is rock solid.

Two slightly detuned generators added up? Somehow beat frequency does not appear.

Mess with trigger? Real scope would either switch to "auto" mode with wildly changing signal or have picture disappear entirely. Here, it's basically no effect.

fuzzfactor
It would be interesting to know what exact browser it is supposed to work with.

Nice graphics though, are very many of the control knobs supposed to be functional?

squarefoot
Not sure I would like a software version + audio interface more than the real thing, but this one would make a great addition to simulation software.
readyplayernull
Nice! Could it get a signal from the microphone?
tabtab
It quickly locked up on me, or at least responds very slowly. I'm curious, what kind of UI is it using? Canvas? SVG?
UncleOxidant
tried to connect a probe from my screen to the board I'm testing. Didn't have any luck :(
throwaway888abc
This is so cool, pressed the ON button out of curiosity and its fully working(!!!) thing

Kudos to author

seabass-labrax
How fun! I love how the numbers look like they are on vacuum-fluorescent displays :)
behringer
The knobs are frustratingly hard to use on a 4k screen.
sr.ht