Function/Waveform Generator || DIY or Buy
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- เผยแพร่เมื่อ 14 มิ.ย. 2024
- JLCPCB $2 for 5 PCBs (Any Color) : jlcpcb.com
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Check out Cezar Chirilas article on All About Circuits: www.allaboutcircuits.com/proj...
You can get the commercial function generators here (affiliate links):
Siglent SDG 2082X: rover.ebay.com/rover/1/711-532...
AE20125: rover.ebay.com/rover/1/711-532...
XR-2206: rover.ebay.com/rover/1/711-532...
More project information (schematic, pictures,.....) on Instructables: www.instructables.com/id/DIY-...
Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:
1x 12V center tapped transformer: s.click.aliexpress.com/e/_dZz...
1x IEC socket: s.click.aliexpress.com/e/_dYQ...
1x B40C2300 full bridge rectifier: s.click.aliexpress.com/e/_dUS...
1x LM7812 12V regulator: s.click.aliexpress.com/e/_d8G...
1x LM7912 -12V regulator: s.click.aliexpress.com/e/_d6u...
1x LM7805 5V regulator: s.click.aliexpress.com/e/_dWI...
1x Capacitor kit: s.click.aliexpress.com/e/_d8N...
1x Arduino Nano: s.click.aliexpress.com/e/_d85...
1x Rotary Encoder: s.click.aliexpress.com/e/_dXK...
1x AD9833 DDS IC: s.click.aliexpress.com/e/_dTc...
1x I2C LCD: s.click.aliexpress.com/e/_d6H...
1x TL071 OpAmp: s.click.aliexpress.com/e/_dXd...
1x BNC connector: s.click.aliexpress.com/e/_dZ5...
1x 10k, 50k Potentiometer: s.click.aliexpress.com/e/_dU8...
In this episode of DIY or Buy we will have a short look at commercial function/waveform generators in order to determine what features are important for a DIY version. Afterwards I will then show you how to create a simple function generator, the analog and digital way. At the end I will then present you a DIY DDS function generator design which can (kind of) hold up to the commercial versions. Let's get started!
Thanks to JLCPCB for sponsoring this video
Visit jlcpcb.com to get professional PCBs for low prices
Music:
2011 Lookalike by Bartlebeats - วิทยาศาสตร์และเทคโนโลยี
-"it did't result in an explosion, perfect"
Electroboom disaproves
Nice to see someone out in there thinking like me.
ElectroBOOM's soul cries in pain until he can murder some capacitors.
Every time happy while first turning on without BOOM.
-(Audience)- "Awww...."
ye lmfao
I've been wanting to build my own function generator for a while now. Thanks for posting this.
You're welcome ;-)
@@greatscottlab ; - )
Seems like a good way to learn about a few things like op-amp scaling, DAC control and UI development. I'm designing a fantasy one right now. Then I'll do one I can actually build.
@@meepk633 Post up both pls
Likewise, maybe this is the one to build.
"This picture may seem complicated.... but if you study this 21 PAGE DOCUMENT it becomes pretty simple." heh
That's a pretty small price to pay for knowledge.
The Mad Philosopher do you just wander around deflating other people’s humor with trite remarks?
believe me that's nothing. Just read a user guide for any modern micro-controller or FPGA. This user guide for the classic STM32 is over 1000 pages. And it is a low-end chip. The F4, F7, and H7 are gaining popularity in the DIY space now mostly because of more flash space.
www.manualslib.com/manual/1276772/St-Stm32f101-Series.html#product-STM32F103%20series
i hope you never study anything then, because each script you get there is houndreds of pages, 21 pages is a joke.
Your DIY or Buy is my favorite TH-cam segment. I always look forward to these. Great job!
Awesome! This goes on my (already long) project list.
And the list is long, and the know-how lags the list! 😆
Obviously very late, but the instability and other issues at high frequency are likely due to the construction of the op amp portion of the circuit. Very good decoupling is important, and the output of the op amp should be followed by a resistor so that the transmission line is double terminated (therefore protected from bad loads) and any capacitive loads don't cause phase margin issues.
You are great teacher.
I always wait for your video.
Keep up man....
Thanks :-)
I saw a lot of different videos on TH-cam about this topic,but everything seemed to be very complicated
Your video was the most simple but yet the best one i come across
Keep it going :)
Thank you very much :-)
I would like to see a video about CAN Bus Systems. Thumbs up for the video man
I can put it on my to do list
@@greatscottlab There are libraries for MCP2515 chip for Arduino IDE and there is also a library for using it with CAN Hacker software.
Yesterday I tested it out on my STM32 Blue Pill board by using stm32duino and it works great!
sun9-69.userapi.com/c857420/v857420683/714f7/aM3nLdigq48.jpg
STM32 Blue Pill also has CAN bus support itself so it doesn't even need chips like MCP2515, it only needs CAN tranciever such as TJA 1050.
“One point five years ago” that had me laugh some
Nobody talks like that :-)
I really like your content, and I appreciate how clear you are with your whole process, especially the analysis of data sheets and circuit diagramming. Thank you!
The squarewave output of those cheap nasty red functiongens alsow works as a sine wave above 100khz
Just reduce the amplitude of the wave and it should look more like a square wave because of reduced time for charging external capacitors
Lol, that's an additional feature .
I think the reason of the malfunctions of these generators are fake IC's, I remember seeing a video of a guy replacing it with a legit one and most problems went away. Of course even original ones have their own limits so there's not that much else it can be done about it
@@TheAzther1 the main reason is shitty op amps with poor slew rate and crappy pcb design. It is not the frequency of the waveform which is the problem. Look at edges of the squarwave. They have to be super fast to reliably generate a square wave. 10MHz squar wave requires edges to rise and fall in like 10ns to keep the signal look like a square wave, not a sine or trapezoid. So to have 10Mhz squarewave you need an op amp with 100MHz bandwith. However, you want to use the op-amp to amplify the waveform, so to have a decent waveform at the output and also a gain of 10 you would need an op-amp with at least 1GHz gain-bandwith product and 100 000 000V/s slew rate to give you 10V p-p voltage. Good luck with that.
素晴らしい語り口。引き込まれてしまう。wonderful narrative. I am drawn to the charm.
Always enjoy your videos!
Saying hello from Santiago de Chile
nice project ,you could use AD9851 or AD9850 for higher frequency ,btw it should be possible to modulate signal eg. AM or FM ,it may be useful
Thank you for this project. I am looking for this for along time.
A waveform generator has been on my want list for a very long time!
One of the first comments!!!
TL071 is not suitable for 10MHz signals,and that's why your freq. gen. deos not work properly at high frequencys. Also, I don't see any decoupling capactors (approx. 0.1uF) near IC power pins. Using high frequency opamp and adding decoupling caps should fix high frequency issues
Great info, thanks! Any recommendations for OP-amp?
@@ObligedTester I know this comment is from a while ago but as I just looked at this based on other comments in this thread this might be helpful for others. Find something low noise and high speed (select this based on your desired max frequency). You may want to consider slew rate as well @w2aew has a great video that explains slew rate and gain bandwidth product for opamps on his youtube channel that will help.
TL071 IS AUDIO IC NOT FOR INDUSTRIAL GRADE . BETTER SWITCH TO MCP SERIES IS BETTER
@@yagneshpatel1183 friends I bought this operation amplifier!!!!Still I have not received any of my items about this project!!!I wanna make this project in 5volts!!!I have dc-dc converter from 5volts to 12volts (the MT3608) and I have the converter from 12volts to -12volts...At first I worry about the output signal voltages because I made my own serial oscilloscope with arduino and the max input is in 5volts and I want to control the output voltage
lm6171 it's a good option
Really like the DIY or Buy episodes
Nice video! I'd like to see in a future DIY or buy episode an RLC meter.
Sweet! Thanks for making this. I think I can use something similar to this for my research doing phase shift keying.
I simply enjoy your videos even if I have no plans to build this circuit.
Even though that it's difficult to understand but I like to watch your videos
diy is always the winner as knowledge is priceless and indefinitely replicable
Fantastic work, dude! 😃
I may make one some day! 😃
I love your build vs buy series. Couldn´t you expand this to give you an arbitrary function generator if you added a keypad to the Arduino to punch in voltages?
Simple and superb function genatator at cheapest prices..👌👌👌
Finally, a project and a good lab instrument for Electronics Hobiests....
Great video as usual :) I have a XR2206, the same one in the video(very common I know) and it work fine for now but if I ever need an upgrade I'm doing this. Thank you sir!
I love this channel. It inspires me to persue the hobby. Unfortunately, or perhaps fortunately, I understand I will never take my skill to his level.
I just want to build a custom keyboard and a programmable universal remote.
I really like the way that you said when you "stole" his code to "save time and effort"
I love the way you say potentiometer.
FYI: AD9834 is a faster DDS. Also a ground plane may help w/noise and stability. Nice video, I appreciated the information. Thinking about DIY to upgrade from my 40 year old Circuitmate.
I really like this series as I really like to do diy over buying things. I think a diy or buy on a UPS for a future video idea!
Hi Scott. I think a great video would be basically a video focused on the parts you usually skip on the videos. So for example let's say you choose something simple like a power supply diy build. Go through step by step buying and ordering the parts. And the soldering as well. Maybe 3d design if it applies for the project
This is really a nice project. I bought a used Philips/Fluke PM 5191 Programmable Synthesizer/Function Generator for $85. It's 0.1 to 2 MHz. Interesting device.
DIY will always be the ☆Winner☆ - for when it comes to test gear.
This will be useful - I need several inexpensive function generators for our electrochemistry lab. I hadn't seen anything over 100 kHz. (I confess I hadn't searched in the last five years.) Thank you.
Great video. I love all your videos. Thank you.
Excellent video. Very helpful
Very good video
You are great elektronik teacher
Awesome video AS ALWAYS! I think it would be awesome if you could do a DIY-OR-BUY on TL-smoothers used to remove the salmon-skin effect on 3d printed parts. Seems like a quick project that would be really interesting! Thanks for all of the great content!
I was looking for this ...Thanks a lot.
I've been waiting for this!! nice
This was epic. Thank you for sharing it.
Nice one! I bought a $50 Chinese DDS function gen a few years ago and found navigating its menu frustratingly cumbersome and its outputs distorted, full of hash and ringing badly. You get what you pay for, I kept telling myself. I then replaced its two output op amps with ones having a better slew rat, per some online videos I found, and got better looking waveforms with less ringing, though they're still not lab instrument quality. In the end I probably spent too much for a cheapie DDS function gen but the experience taught me a few things about how these things operate.
Oh my, the DDS is very clever. I like it.
I bought the UDB1008s 8Mhz function gen from aliexpress for 20 bucks. It does very clean 7Mhz sine, and okay 700kHz square and triangle, with sawtooh and pwm support. Perfect for DIY.
Hi I'm your biggest fan.
I always wait for your videos💜💜
Thanks :-)
Holy crap. This video is perfect. I was just researching the xr2206
Thank you. Glad you like it :-)
Cezar Chirila, bravo si salutari!
I've been trying out an AVR microcontroller with an R2R DAC and well, it kinda worked. Needs some polishing though, as adjustable offset and amplitude can be useful.
It seems like a must have for a guitar pedal enthusiast, at least for me.
what ever u recommend , I really enjoy your videos Scot also your voice sooths me 😌😉 you're amazing 🎊🎉 keep doing cool stuff and your #like is coming from ma heart ! hugs from Greece 🙋🙌...stay creaaaaaatiiiiiv an' I wiiilll seeeeee uuuuu next time 😀😁😉
I love your diy or buys
Fantastic project
Thanks for sharing 👍😀
amazing project, which filament did you used?
It would be great to create a function generator with also sine sweep and random noise signals.
love this series man :))))))
Ever time I see ur videos notification I hope for the drone video
hoping the day comes soon
Not soon.
Oooh! New colours of the markers!
FY6800 DDS Signal Generator/Counter is amazing value for money - worth a look for anyone considering a budget unit.
One of the problems with those is the crappy Switch mode power supplies that have been fitted inside them, which is not what you need with a sig gen, people have modded them very easily with linear power supplies though so not all bad. Few good channels on YT cover this.
@@Adrian_Finn The noise from the switch mode power supply is though far from bad on the units.
Since it gets drowned by the harmonics from the signal generator itself.
Also, a linear power supply will generally couple through all the noise from one's mains wiring, so have a computer or other switch mode powered device connected nearby and you will have just as much noise from the linear supply.
In any case, the issue can easily be rectified by adding a bit of extra output filtering from the supply, not that this matters much due to the signal generator already having enough harmonics and other crap that it literally drowns the noise from the power supply. (In the end, I wouldn't recommend practically any DDS for RF use, obviously.)
The real issue with these devices is the floating AC on the earth side of the BNC connectors (measured with reference to a true earth.) Not enough current behind it to harm you but more than enough there to fry the delicate inputs to a microcontroller.
@@SpeccyMan You seem to be referring to the FY6600, not the FY6800.
@@SpeccyMan This is indeed a problem.
I solved it by adding a wire going over to mains earth. Seemed trivial enough.
Though, to an exceptionally small degree, one could regard the non-earthness of it as a "feature", if it weren't for the huge amounts of common mode noise...
Great work. You should have designed a PCB with good RF characteristics in order to achieve much better High frequency performance. Additional Filter circuits on the in- and output also would have made a significant difference. Also choosing a low noise op amp on the last stage is mandatory. Anyway great project!
Nice project after a "while"
Love the project, just a reminder that 123D is discontinued and basically superceded by Fusion 360 (which is also free for hobbyists, students, and small startups).
I am very big fan of you. Please make a video on your Electronics lab.
Danke für das Design, ich werde es wohl mit 2x 9V Batterien nachbauen.
What kind of filament did you use for the box of your Function Generator? I really like how it looks
Thank you, Cesar!
To have better performance at high frequencies, you should used opamps with higher gain bandwidth products (GBP). Because the DDS would not give wrong signal it is only the mistake of signal processing. It seems that you are using TL071 opamp which has GBP of 5.25Mhz and you are using it to amplify by a factor of 22, so the bandwidth of this configuration of opamp will give you a reliable signal bandwidth of around 23 khz
Ty. Great vid. My next project lol.
Please do a video about whether should one build a diy 200MHz oscilloscope or just buy one.
It'd be interesting to troubleshoot the issues you saw at higher frequencies, to try and get the maximum performance out of this chip. And to me, the MVP (minimum viable product) would also have variable duty cycle, at least for square wave. That way you can also play around with PWM stuff (and it would match the features of the function gen in my oscilloscope). Without looking at the datasheet, I'm not sure if the chip will do this without any extra hardware, but I do know you can generate PWM signals from a triangle wave using a comparator.
Wow. Great video. Thank you.
Thanks for posting this I has given Ideas to make something similar
have a look to the JDS6600 function gen, it Outputs up to 20V+/- and easy up to 16MHz and it can do programmed waveforms… cost appx 60$
FY6800 from Banggood and others is about $90 US. 60MHz 20Vp-p output with a decent display and a normal case.
Another great video! Thank you!!!
You could easily have built the op amp offset for the 70 Euro commercial unit and saved so much work!
Nice, I can Try to build my own!
You should add a low pass filter after the DDS chip. Maybe a 15MHz or so LC ( or higher order). This will improve the the signal output at higher frequencies.
You are clever. You can all of electronic. Good luck.
GreatScott! Could you please make a video comparing spectral performance of DDS, XR-2206 and AE20125?
I'm curious about their SFDR (first harmonic amplitude) and spectrum in general for 50 Ohm and 600 Ohm load.
great project i was waiting for it until I found another DIY function generator on google which contains more functions than your version like saw tooth or ECG or noise with R2R DAC but it's maximum frequency is 0.65 MHz so i think both are good
Amazing Explanation.
Nice one. Thanks Scott.
That box you printed looks nice! What 3D printer and materials did you use?
Love your channel!
Thanks you :-)
As always magnificent, 💜
Nice one... I was looking forward for thsi video... but I have a question... if want to build an osciloscope that goes up to 2.4/5GHz in order to test diy wifi antennas... what components should I use?
i have build it & it worked fine , thanks.. however how much max amps it can give output ?
Definitely A Project That I will build..
Awesome!
No way... Amazing! 🎉
Great video!
Sorry, what filament is that?
BTW. Excellent video as always!
Next video: Space shuttle; DIY or buy😂😂
We all know which option elon musk opted for ;)
nice thanks for all helping video and content your so amazing, but I have a question? what is the output current of the transformer because you put a 2 amp fuse and then with an 8 amp full bridge diode you get 0.8 amp current at the output,Im a bit confused,can you help me?
Epic! more on this show!!!!
Actually You almost fit my current project :) I am building DIY Function generator based on AD9834 (35MHz), but most of Your written problems are the same.
About Amplitude and Offset - Need to use it with meaning, that its not going out of OpAmp power range. I am planning to use STM32F072 wich have 12bit DACs integrated to control offset and amplitude of AD9834. Amplifiers will be LM7171. I'll add also one PWM output from STM as second channel. As display its planned to OLED 2.4" with SSD1309 controller. About power supply I am still thinking - I think I should use some linear stabilisers for better power quality. Possibly Transformer is very good choise for analog part. For digital part can be used also SMPS. Allready bought some old function generator case with buttons on eBay and AD9834 board from AliExpress - so now is only breadboarding and testing and coding. Thanks for Your review about this topic man!!!
Personally i prefer second hand electronics from ebay over some DIY project: if you have the time to search for bargains, you can score some amazing deals. And if you know how to repair electronics, you can get a pretty nice setup for cents on the dollar: Just browse for broken equipment, google the schematics and if you find them, buy it. I have gotten two Oltronix B703 (basically three really nice separate power supplies in one small box) for 35 bucks among other stuff. Yes, it can be frustrating and time consuming to repair it, but it is totally worth it.
Next video DIY stair case light using adrino and pir sensor