Excellent. At the time I did this, the DSP138 was one of the few cheap mini scopes. It's a decent tool. The case sucks but there is too much exposed if not cased. The banana clips make easy breadboard testing. The cool thing about the kit is, you built it, it's yours. Good job.
It's a handy little kit that can be used for basic stuff and learning how an oscilloscope works. It is very limited in bandwidth but still good for some basic breadboard experiments. There is a guy on github who has improved it and also added a second channel. I have put the link in the video description. Thanks for watching.
Thanks for explaining how it works. I've worked a lot with electronics and making, but never really used an osc much. I built this DSO138 almost ten years ago and only used it a few times without really understanding most settings. Eventually I worked out how I could get the info I needed (register an analog trigger signal for a piezo-based sensor) but with this video it'll be a lot easier.
Glad it was helpful! This electronics kit series is all about soldering practice for beginners and making up these kits to learn what these things do. Obviously they are not up to the performance of proper test equipment but are very useful if you are tinkering around on a breadboard with electronic components etc. Thanks for watching.
Some years ago my son got a DSO 138. It's a pretty nice unit, however, it does not live up to the advertised 200KHz bandwidth. The measured bandwidth at 3db down is actually 40KHz. For those unfamiliar with this specification, that means that a 1V peak to peak sine wave at 40KHz will be dispayed as a .707V peak to peak signal. Other than this, it worked very well, and was a good value at its low low price. Keep the videos coming!
It's a good little device to learn the basics of an oscilloscope and a good soldering exercise. Obviously it's not up to the standard of a proper scope but it was fun to build and hopefully will give others just starting out in electronics some valuable experience. There was a post in the JYE Tech forum that said that changing the TL084 quad opamp for a better one would give slightly better bandwidth. There is also a guy on github who has improved the design and even added a second channel to it. I've put the link under the video description. Thanks for watching.
That's a shame. It's really just a soldering exercise and teaches the basics of an oscilloscope for beginners. It's no substitute for a 'proper oscilloscope'.
These things are toys at best. They are not really to be used as accurate scopes, HOWEVER... They do have a time and a place. Since their complexity is nowhere near the complexity of a bench scope it's easy to get your head around what is happening and you can learn valuable electronics skills from building it , especially if you go into the detail of how every bit of it works, instead of just saying... ohh, this resistor goes here and that tranny goes there. and then i'll just solder it all up. No.. you can learn quite a few things building these things but as for using it as a scope............. NO, IT'S SHIT the bandwidth is low, usually in the kHz range, everything's gonna be crusty. so... Time and a place for everything But as you learnt, These things should not be bought if you actually want a scope that lasts you a while and is accurate
I didn't have any issue with Wish this time. It seems a lot of people don't like Wish. I will most probably not use Wish again as there are plenty of alternative suppliers. Thanks for watching.
Lovely cool videos you make! I saw some pictures where the top part of the display was data, voltage, frequency and more. Can you get it to do that? Can you find a nice little frequency counter in the same series? (1-100kHz)
That requires a firmware update for it to be able to show that information. I might look at that in the future. I will be looking to get an electronics kits counter soon. Thanks for watching.
@billfrug, it depends on what you want it for. There are so many different ones these days for different tasks. Ideally you want one you can get a selection of different size of tips for. I think the ones where the heater cartridge and soldering tip are all-in-one are a good idea, like the KSGER with T12 combined heater cartridge and tip. If you search for those 2 terms on Ali Express you will find some great bargains on them. Amazon have them too, but more expensive. Traditionally in years gone by, the big brands were Weller and Pace. Then along came Hakko and JBC. All of these professional brands are very good but very pricy for the hobbyist. Then the Chinese clones came along like the KSGER with T12 bits which are a very good hobbyist soldering iron. Give one of those a try. They are compact with good temperature control and very easy to change the bits/heater cartridge for different tasks and not expensive.
Thank you for an interesting video. These kits are a great way to get started in electronics. Before using the "real" scope probe in 10:1 mode you will need to make sure the input impedance of the kit is 1 megohm in all of the vertical modes, otherwise the displayed amplitudes won't be accurate. Or just test it with known input amplitudes. Regards, David
![[Full] 4 ต่อ 4 Celebrity EP.920 | 3 พ.ย. 67 | one31](http://i.ytimg.com/vi/KwiW2M_kAg4/mqdefault.jpg)
Excellent. At the time I did this, the DSP138 was one of the few cheap mini scopes. It's a decent tool. The case sucks but there is too much exposed if not cased. The banana clips make easy breadboard testing. The cool thing about the kit is, you built it, it's yours. Good job.
It's a handy little kit that can be used for basic stuff and learning how an oscilloscope works. It is very limited in bandwidth but still good for some basic breadboard experiments.
There is a guy on github who has improved it and also added a second channel. I have put the link in the video description. Thanks for watching.
Thanks for explaining how it works. I've worked a lot with electronics and making, but never really used an osc much. I built this DSO138 almost ten years ago and only used it a few times without really understanding most settings. Eventually I worked out how I could get the info I needed (register an analog trigger signal for a piezo-based sensor) but with this video it'll be a lot easier.
Glad it was helpful! This electronics kit series is all about soldering practice for beginners and making up these kits to learn what these things do. Obviously they are not up to the performance of proper test equipment but are very useful if you are tinkering around on a breadboard with electronic components etc. Thanks for watching.
Great kit, great video!
Thank you, glad you enjoyed it. Plenty more stuff to come. Thanks for the sub.
Some years ago my son got a DSO 138. It's a pretty nice unit, however, it does not live up to the advertised 200KHz bandwidth. The measured bandwidth at 3db down is actually 40KHz. For those unfamiliar with this specification, that means that a 1V peak to peak sine wave at 40KHz will be dispayed as a .707V peak to peak signal. Other than this, it worked very well, and was a good value at its low low price. Keep the videos coming!
It's a good little device to learn the basics of an oscilloscope and a good soldering exercise. Obviously it's not up to the standard of a proper scope but it was fun to build and hopefully will give others just starting out in electronics some valuable experience.
There was a post in the JYE Tech forum that said that changing the TL084 quad opamp for a better one would give slightly better bandwidth.
There is also a guy on github who has improved the design and even added a second channel to it. I've put the link under the video description. Thanks for watching.
@@JazzyJane_uk I agree it's a nice unit, my son loved it. Keep up the videos!
this channel is cool, subscribed
Glad you are enjoying the videos. Plenty more to come. Thanks for watching and thanks for the sub.
i got one of these a while ago and the display was DOA... ended up just buying a proper oscilloscope
That's a shame. It's really just a soldering exercise and teaches the basics of an oscilloscope for beginners. It's no substitute for a 'proper oscilloscope'.
These things are toys at best.
They are not really to be used as accurate scopes, HOWEVER... They do have a time and a place.
Since their complexity is nowhere near the complexity of a bench scope it's easy to get your head around what is happening and you can learn valuable electronics skills from building it , especially if you go into the detail of how every bit of it works, instead of just saying... ohh, this resistor goes here and that tranny goes there. and then i'll just solder it all up.
No.. you can learn quite a few things building these things
but as for using it as a scope............. NO, IT'S SHIT
the bandwidth is low, usually in the kHz range, everything's gonna be crusty.
so... Time and a place for everything
But as you learnt, These things should not be bought if you actually want a scope that lasts you a while and is accurate
OMG Wish? Congrats for being lucky!
I didn't have any issue with Wish this time. It seems a lot of people don't like Wish.
I will most probably not use Wish again as there are plenty of alternative suppliers.
Thanks for watching.
Lovely cool videos you make!
I saw some pictures where the top part of the display was data, voltage, frequency and more. Can you get it to do that?
Can you find a nice little frequency counter in the same series? (1-100kHz)
That requires a firmware update for it to be able to show that information. I might look at that in the future. I will be looking to get an electronics kits counter soon. Thanks for watching.
3:10 in this example the waveform is rounded on THE LAGGING edge, not the leading edge
Could you recommend a good soldering iron?
I was always a Weller brand fan due to my military electronics days but in recent years Cross Mars TS101 has proven to be a good alternative
@billfrug, it depends on what you want it for. There are so many different ones these days for different tasks. Ideally you want one you can get a selection of different size of tips for. I think the ones where the heater cartridge and soldering tip are all-in-one are a good idea, like the KSGER with T12 combined heater cartridge and tip. If you search for those 2 terms on Ali Express you will find some great bargains on them. Amazon have them too, but more expensive.
Traditionally in years gone by, the big brands were Weller and Pace. Then along came Hakko and JBC. All of these professional brands are very good but very pricy for the hobbyist.
Then the Chinese clones came along like the KSGER with T12 bits which are a very good hobbyist soldering iron. Give one of those a try. They are compact with good temperature control and very easy to change the bits/heater cartridge for different tasks and not expensive.
big fan of the Hakko T12 clones. you can get them from various sellers, and I like the K (angled chisel) tip
@@JazzyJane_uk Thanks for the detailed reply, cheers!
Thank you for an interesting video. These kits are a great way to get started in electronics. Before using the "real" scope probe in 10:1 mode you will need to make sure the input impedance of the kit is 1 megohm in all of the vertical modes, otherwise the displayed amplitudes won't be accurate. Or just test it with known input amplitudes. Regards, David