I highly recommend the DSO138 oscilloscope

Thanks for the tip! Cool that it runs on 5V! Do you think one could create an AEM module with it? I.e. mount it behind a cut-out blank panel in the case and add some patch wire sockets for the inputs?

I use a VMPE ZeroScope in one of my Eurorack cases, because it's small and I really just want to see waveforms and not precisely measure stuff there. Here's a video of it in action, showing the output of an Ardcore sketch I wrote. It has two inputs, so it can do X-Y waveforms as well. Having that in the AS Modular would be nice too.

I'll be honest I had a DSO138 (not mini) , and found it pretty unreliable    - the one I had was prebuilt, and was a verified 'original' (there are quite a few clones out there apparently)

I will say it was good when it was working, lots of functionality, and cheap as chips - but one day I got so fed up with messing with it, I just chucked it in the bin
.. of course, might just be I got a bad one, or perhaps its was built badly (though i looked at the circuit, and seemed well built, no obvious issues) , but it put me off them,


anyway, I went on the look for something else, and as i was getting into DIY, I bought an Analog Discovery 2 which is not only a oscilloscope, but also signal generator, and power supply.
I solder a quick set of leads to a 3.5mm jack to allow quick plugin to eurorack, or you can use the pins directly to AEM.
the software is very good, allowing you not only to capture waveforms but also measure things... see my bela thread for how i used it to debug a noise issue!

its not cheap though, so Im sure there are lots of alternatives to this (and honestly, my eyes glaze over when tech specs of scopes are discussed, i guess because for audio the sample rates it not that important) 


its great for debugging things, but of course its not as handy as having something in the rack though...

So, I wonder what would be a good options for an audio waveform scope in a rack...

these small oled, that seem to be in many eurorack modules,  are really cheap - esp. for monochrome, then just need something to drive it, I guess some micro-controller with an audio rate ADC?

hmm, I have an small oled, and an arduino nano and teensy 3.2 sitting around in my spares box,
i think the nano cannot do the SR required, but the teensy 3.2 can. 

so perhaps if i can dig up the oled library and add for the teensy this might be quite a simple project.

thoughts? 

(it is about time I started using the nano and teensy for something, had them for a while - but just not got around to that initial step of determine software setup required, and working out the ide etc.. a small thing, but its usually the tedious bit of developing on a new platform )

I thought already a lot about a scope module for AE; especially for beginners I find it quite useful to get the relation between waveform and sound.
My thoughts go towards a module with one of these OLED displays, with the following functions:
- scope
- spectrum analyzer
- frequency meter/ tuner
- ...anything else?
Great to see I'm not alone with this idea ;-)

I cant remember exactly it was a while ago... but the basics were sometimes the signal would not show, sometimes it would... ( I think sometimes it was also attenuated)
i think id do hard resets, and then occasionally it would start working.
I checked the connections on the board for the probes, and they seemed fine - I tried reseating the top/bottom part - all would seem to fix it for that session,
then the next time it'd not work, and Id have to mess about with it for 10 minutes to get it working again.

I just got frustrated that every time i went to use it, id spend a while having to fiddle with it, each time thinking, this time its going to final stop working entirely. 

likely a bad build as you say, and I did read others having similar issues ... but some are totally happy with theirs.

but given it wasn't too expensive, I didnt really care that much, and I also then knew more what i was looking for in a scope - so considered it an education process!





scopes are pretty , and these 2 would be really useful additions

2 channel would be cool, either as Felix says for x/y or for comparing waveforms (so same time axis)

Just saw this on Instagram: intellijel brining out a 1U Eurorack tile ZeroScope together with VPME.de

http://instagram.com/p/Bn_jRTwnPYd

I was thinking that I'd like some tools for microtuning, so frequency is a must. However, sometimes it's the frequency ratio between two signals (or a signal and an internal reference oscillator) that might matter more. I am not sure if this would be a good addition or not but I'll try to make something to test soon. I was thinking a teensy and the sparkfun OLED shield for my first try but I like some of the suggestions here on the forum.

That said, I will probably try for a dedicated microtuning module with quantizer and scale re-mapper etc. The Teensy's DAC might be enough on its own. Anyway, I'll try to expand on this idea and start up a microtuning discussion because, "If there's one, there's probably another"  - Rod.

When my AE modular arrives, i’ll definitely make a DSO module.
I’ll try to make a stretched version of the plastic case to fit in the AErack. 

It would take up 5 units (125mm) so a slim little Teensy-based one would still be great for realestate reasons.

I may try to get the whole unit more flush with the panel as I'm worried that some of my custom stuff won't fold down nicely with two cases and a hinge. However, I think it will be largely unavoidable in the case of DIY breadboard modules and the ones I intend to make for LittleBits.

I also ordered two adapter cables which make it easier to use the DS212 with the AE Modular.

They’re MCX to BNC cables as I already had BNC to RCA adapters at home. There are MCX to RCA cables too though.

Using a stereo RCA to 3.5mm TRS cable then, you can plug the scope into one stereo port on the 4I/O module, which also takes care of grounding.



EDIT: just found this hack a day article about it:
hackaday.com/2017/11/18/ds212-oscilloscope-review-open-source-and-great-for-hacking/

The software of the scope is open source!