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Diy oscilloscope #parts

 

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them.?

Chris

Screenshot_2018_01_31_21_36_32.png
Screenshot_2018_01_31_16_10_50.png

 

Just hope yours works. I built 2 of them both had bad parts. tossed them in the parts bin, now use a hand me down from a SK.
--
David

?N8DAH
Joe Puma
 

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Do you have a link to this kit? I would love a scope but funds are short.?

Joe
KD2NFC?



On Feb 1, 2018, at 1:46 AM, Christopher Miller <djmalak2k6@...> wrote:

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them.?

Chris
<Screenshot_2018_01_31_21_36_32.png>
<Screenshot_2018_01_31_16_10_50.png>
 


--
David

?N8DAH
 

Where did the case come from? Mine didn't include it.
Tom

KBRwyle | TRITON NATOPS/NATIP Product Support
22309 Exploration Drive | Lexington Park, MD 20653 | USA
Office: 301-863-4418 | Mobile: 301-904-2053
tom.clarke@... [Pri] | frederic.t.clarke.ctr@...
________________________________________
From: [email protected] [[email protected]] on behalf of Christopher Miller [djmalak2k6@...]
Sent: Thursday, February 1, 2018 1:46 AM
To: [email protected]
Subject: [BITX20] Diy oscilloscope #parts

Pics of the oscilloscope kit I purchased. It seems a lot of people don't have them.

Chris
 

If you google or ebay search you can find a few kinds with and without cases

--
David

?N8DAH
Joe Puma
 

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Thanks, as an example what are some of the testing functions you can use this with, with its specs lets say on a ubitx?

?

I want to learn more about using a scope while I diagnose and explore my ubitx build so I don’t know what the 0-200KHz range on that scope can do.

?

Joe

KD2NFC

?

Sent from for Windows 10

?

From: N8DAH
Sent: Thursday, February 1, 2018 1:00 PM
To: [email protected]
Subject: Re: [BITX20] Diy oscilloscope #parts

?


--
David

?N8DAH

?

B23E3842D58F4E899167ECFC5C5747E3.png

 

good read

?I too am just getting into test equipment, google and lots of reading is all I can say.
--
David

?N8DAH
 

I may have to get me one of them thar? DSO138's
At $23, fine with me if it doesn't actually work.
Still get an STM32F103 development board, an nice display, a scope probe, and that BNC to alligator thingie.
At that price, OK if one of the four does not work.

There's open source firmware for that scope:
? ??

Analog bandwidth for a sampling scope is generally 1/5 of the ADC sample rate, so maybe useful to 200khz.
Good enough for much of what's needed around a bitx, especially if you don't have $400 for a Rigol.
To look at the RF stuff, might get by with a low end spectrum analyzer using something like the uBitx front end
up through the 12mhz crystal filter plus an ad8307 that can switch to either before or after that filter..

That DSO138 is using exactly the same processor as my Blue Pill (you do want to choose Truth, right?)
? ??
Note that the blue pill is faster (much), cheaper (a bit), more memory, and more IO pins than a Nano.
I have no idea how they manage to sell them for $2.
Though it's not quite so fluent in Arduino as the Nano.
That takes some hardware hacks, and it's missing some libraries.

So could create a minimalist scope for $2 plus some junkbox R's and C's if you are really really cheap.
Send the data over whatever link you programmed it with for display on a laptop.

The STM32F401 has 64kbytes of RAM, a 2.4mhz ADC.
Same family as the STM32F103, software should port easily enough.

Jerry, KE7ER


On Thu, Feb 1, 2018 at 09:59 am, N8DAH wrote:
Joe Puma
 

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On Feb 1, 2018, at 2:02 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

I may have to get me one of them thar? DSO138's
At $23, fine with me if it doesn't actually work.
Still get an STM32F103 development board, an nice display, a scope probe, and that BNC to alligator thingie.
At that price, OK if one of the four does not work.

There's open source firmware for that scope:
? ??

Analog bandwidth for a sampling scope is generally 1/5 of the ADC sample rate, so maybe useful to 200khz.
Good enough for much of what's needed around a bitx, especially if you don't have $400 for a Rigol.
To look at the RF stuff, might get by with a low end spectrum analyzer using something like the uBitx front end
up through the 12mhz crystal filter plus an ad8307 that can switch to either before or after that filter..

That DSO138 is using exactly the same processor as my Blue Pill (you do want to choose Truth, right?)
? ??
Note that the blue pill is faster (much), cheaper (a bit), more memory, and more IO pins than a Nano.
I have no idea how they manage to sell them for $2.
Though it's not quite so fluent in Arduino as the Nano.
That takes some hardware hacks, and it's missing some libraries.

So could create a minimalist scope for $2 plus some junkbox R's and C's if you are really really cheap.
Send the data over whatever link you programmed it with for display on a laptop.

The STM32F401 has 64kbytes of RAM, a 2.4mhz ADC.
Same family as the STM32F103, software should port easily enough.

Jerry, KE7ER


On Thu, Feb 1, 2018 at 09:59 am, N8DAH wrote:
 

I am about to start. I will send updates.?

kf4ftr
 

oops I didn't see all the replies. I purchased the kit and the case on wish. They are sold separately. It looks like its searchable by dso138 or 13804k.

chris kf4ftr
 

Try this one, I built one last summer and it works very well.? Has many features including a digital volt meter.

All SMD so you need your mag glasses to assemble.


IMG_20180201_162516_1_.jpg

 

I now see that JYE-Tech has made their source code available for the DSO138 scope.
? ??
The source on github I referenced previously has some new features added beyond the original JYE-Tech code.

And here's the user's manual, including complete schematics:
? ??

Very nice of JYE-Tech to release all that, would be good karma to support them by avoiding clones.
It's more likely to work, and you are more likely to get support if it doesn't.
They specifically mention the SainSmart clone up on their website.

Though if all you need is to poke at the audio and control circuits of a *Bitx*
and are willing to live with displaying it to a laptop screen,
the $2 BluePill plus a couple voltage scaling resistors?is about all it would take.
Well, that and a week to get it working properly.

Jerry


On Thu, Feb 1, 2018 at 11:02 am, Jerry Gaffke wrote:
There's open source firmware for that scope:
? ??
Fred Buecker
 

There are a ton of these on Amazon as well. Found this one as a kit, based on the DSO328:




On Feb 1, 2018 3:45 PM, "Christopher Miller" <djmalak2k6@...> wrote:
oops I didn't see all the replies. I purchased the kit and the case on wish. They are sold separately. It looks like its searchable by dso138 or 13804k.

chris kf4ftr
 

On Thu, Feb 1, 2018 at 01:40 pm, Jerry Gaffke wrote:
Very nice of JYE-Tech to release all that, would be good karma to support them by avoiding clones.
It's more likely to work, and you are more likely to get support if it doesn't.
They specifically mention the SainSmart clone up on their website.
To build on Jerry's point, is worth a read.? I've been looking at these kits off and on and had no idea.?
I've purchased SainSmart filament in the past, never again.
 

I think that DSO138 scope would be quite useful for audio stuff and for looking at control lines from the Nano.
I'm not convinced it would show an envelope when looking at RF from the modulator, just a DC average.

JYE has posted their manual with complete schematics:
? ??
and posted their original source code (the stuff I pointed to earlier has a few extra features):
? ??

Would be good karma to buy from them, and their's is more likely to work and get technical support.
There are clones.

Jerry


On Thu, Feb 1, 2018 at 01:32 pm, Dexter N Muir wrote:
RF to/from will show the envelope.
Master Ice
 

?
Hi all.
?
Be warned these scopes are of absolutely NO use for RF work.
The bandwidth is 200KHz AT BEST!
No use whatsoever for RF work.
?
Also their reliability is very suspect as I know of 3 people who have built them and then, within a very short space of time they have failed and ended up in the bin.
?
Also if you go to the proper JYE TECH site forum there is a HUGE list of companies selliing FAKE JYE Tech DSO138 one of which is Sainsmart.
They also tell you how to identify the fakes.
?
as the old expression goes Caveat Emptor (let the buyer beware)
?
Slim G4IPZ

Virus-free.

 

uh... see my photo. I purchased this on wish and according to what was just sent it isn't a clone.?
 

20180201_150632.jpg

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