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Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

rtestardi.github.io

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Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#91

Post by londons_explore »

atoav wrote: post #32

Mandatory caveat: beware of ground loops when using a USB oscilloscope! Most budget USB scopes share ground with your PC via the USB port. If you're probing high-voltage circuits (e.g., mains power, switching supplies), this can create a dangerous potential difference, risking damage to your computer or worse. Some scopes offer isolated inputs, but if yours doesn’t, use differential probes or an isolation transformer…

it can also be good... only 1 wire to connect instead of two to see whats happening on a pin.

Seems like magic.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#92

Post by badc0ffee »

teleforce wrote: post #78

For the price this small thing is really awesome. I think the posted title need to be improved and updated to include function or waveform generator instead of just More. Perhaps because of that most of the comments here just focusing in the oscilloscope part. As any who has dabbled with electronics know your typical workbench is normally consist of oscilloscope, logic analyzer, waveform generator, digital multi-mete…

How does it compare to the $100 "YouTube-famous" Zoyi ZT-703S?

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#93

Post by just_mc »

rtestardi wrote: post #86

Hi all, new here. One post below might be a bit misleading -- it's just 18 Msps, not 100 -- so think of it as good for signals up to 1 MHz or so with decent fidelity... And it uses a PIC32, not STM32. It is 12 bit ADC, but the noise floor makes it more like 10 or 11. A cool thing is it also does digital capture and waveform generation at the same time, but clearly it's all pretty simple... My goal was to be able to g…

What you've done is awesome. Ignore the haters and build your mosquito scope.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#94

Post by teleforce »

badc0ffee wrote: post #92
teleforce wrote: post #78

For the price this small thing is really awesome. I think the posted title need to be improved and updated to include function or waveform generator instead of just More. Perhaps because of that most of the comments here just focusing in the oscilloscope part. As any who has dabbled with electronics know your typical workbench is normally consist of oscilloscope, logic analyzer, waveform generator, digital multi-mete…

How does it compare to the $100 "YouTube-famous" Zoyi ZT-703S?

Thanks for the info never heard it before, it seems to be an improved 2 channel with 50 MHz version of the older ZT702S single channel version [1].

The Flea-Scope is only 4 MHz single channel so this more similar to the older ZT702S 10 MHz version.

[1] EEVblog 1597 – Zoyi ZT-703S $80 2CH 50MHz Oscilloscope/Multimeter Review:

https://www.eevblog.com/2024/02/07/eevblog-1597-zoyi-zt-703s...

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#95

Post by mianos »

cushychicken wrote: post #46
serviceberry wrote: post #19

I think projects like that would have been a godsend 2-3 decades ago, when even a basic oscilloscope costed as much as a used car. Nowadays, very good oscilloscopes with 200 MHz bandwidth, good user interfaces, and responsive displays are selling for $300 - I'm talking Siglent, Rigol, UNI-T. So the merits of DIYing something much worse just aren't quite there. It's that one piece of equipment you use to troubleshoot…

The new Rigol DHO800 series are fabulous bargains for the money, and extremely well designed in a lot of ways: - 12 bit ADC frontends - Actually usable touchscreen inputs - Super simple to drive remotely over a network connection (though getting the IP address with just the touchscreen is a little tricky) - USB-C power input - you can run it from a battery pack if you like! - All the essential decoders built in for f…

I also got one last year. It's a hundred times better than the little ones discussed in this test.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#96

Post by ericol »

gary_0 wrote: post #66
ericol wrote: post #42

Earlier quoted context omitted.

> very good oscilloscopes with 200 MHz bandwidth, good user interfaces, and responsive displays are selling for $300 This is a very strong first world POV. Those U$D 300 rank pretty high across world's minimum salaries [1], not to mention that prices can very likely double in countries like my own. Moreover, a large % of people that can really get a very good use of this (Kids in high school) usually have a lot less…

The future has been here for a while but remains unevenly distributed.

Probably my favourite Gibson phrase.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#98

Post by Reviving1514 »

rtestardi wrote: post #86

Hi all, new here. One post below might be a bit misleading -- it's just 18 Msps, not 100 -- so think of it as good for signals up to 1 MHz or so with decent fidelity... And it uses a PIC32, not STM32. It is 12 bit ADC, but the noise floor makes it more like 10 or 11. A cool thing is it also does digital capture and waveform generation at the same time, but clearly it's all pretty simple... My goal was to be able to g…

I know you are looking at this for education but I've actually ordered two to toss in my travel bag for when I visit factories to handle manufacturing bringup.

Great tool. Thank you.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#99

Post by burgerone »

rtestardi wrote: post #86

Hi all, new here. One post below might be a bit misleading -- it's just 18 Msps, not 100 -- so think of it as good for signals up to 1 MHz or so with decent fidelity... And it uses a PIC32, not STM32. It is 12 bit ADC, but the noise floor makes it more like 10 or 11. A cool thing is it also does digital capture and waveform generation at the same time, but clearly it's all pretty simple... My goal was to be able to g…

I think the low cost of the flea-scope justifies sticking to just one analog input per device, even with a successor, provided that the interface gets a little bit of an upgrade to be able to handle multiple scopes at once.

This would retain the small form factor and would keep the design free from compromises.

Re: Flea-Scope: $18 Source Available USB Oscilloscope, Logic Analyzer and More [pdf]

#100

Post by jzer0cool »

bsder wrote: post #87
sangnoir wrote: post #47

Earlier quoted context omitted.

> you either want to get into electronics or not. If not, there's no real point in spending the money, even if it's $2 It's fuzzier than that; there are hobbies that look fun but I can't decide if I want to fully invest into them, but having a cheap, but not-great equipment is a good stepping stone. Besides, beginners won't have the skill to fully use fully-featured pro-level-gear. A cheap soldering iron is great for…

> having a cheap, but not-great equipment is a good stepping stone. I don't agree for something like this. The problem is that beginners often don't understand how to deal with the limitations of equipment--all they understand is that something is wonky and they don't know how to fix it. In addition, bad equipment can make your initial impressions so painful that they prevent you from going further. Oscilloscopes, ch…

Could someone recommend one starting out (something beginner could use and has enough, good functions for continued use into later advanced projects without running into limitations for 'most' projects).

Would be helpful to understand the what limitations might be encountered such at the frequency.

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