Function/Waveform Generator || DIY or Buy

[@alenasenie6928]

-"it did't result in an explosion, perfect" Electroboom disaproves

[@reggiep75]

Nice to see someone out in there thinking like me. ElectroBOOM's soul cries in pain until he can murder some capacitors.

[@Scorry]

Every time happy while first turning on without BOOM.

[@pyrojason]

-(Audience)- "Awww...."

[@mkbharadwaj4560]

ye lmfao

[@ZoniaTV]

I've been wanting to build my own function generator for a while now. Thanks for posting this.

[@greatscottlab]

You're welcome ;-)

[@mathiasbackof4993]

@@greatscottlab ; - )

[@meepk633]

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.

[@Jay-fp8iy]

@@meepk633 Post up both pls

[@patprop74]

Likewise, maybe this is the one to build.

[@skittermckitter05]

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.

[@Dak47922]

"This picture may seem complicated.... but if you study this 21 PAGE DOCUMENT it becomes pretty simple." heh

[@TheMadPhilosopher]

That's a pretty small price to pay for knowledge.

[@jtb8631]

The Mad Philosopher do you just wander around deflating other people’s humor with trite remarks?

[@power-max]

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

[@SimonBauer7]

i hope you never study anything then, because each script you get there is houndreds of pages, 21 pages is a joke.

[@mackdlite5900]

Your DIY or Buy is my favorite KZbin segment. I always look forward to these. Great job!

[@Miata822]

Awesome! This goes on my (already long) project list.

[@Stoneman06660]

And the list is long, and the know-how lags the list! 😆

[@UP.electronic]

I saw a lot of different videos on KZbin 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 :)

[@greatscottlab]

Thank you very much :-)

[@innovation4u336]

You are great teacher. I always wait for your video. Keep up man....

[@greatscottlab]

Thanks :-)

[@lukahierl9857]

The squarewave output of those cheap nasty red functiongens alsow works as a sine wave above 100khz

[@Rainbow_Sword]

Just reduce the amplitude of the wave and it should look more like a square wave because of reduced time for charging external capacitors

[@abdulazeez.98]

Lol, that's an additional feature .

[@TheAzther1]

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

[@krissolshaq4934]

@@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.

[@blackwingmaster141]

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

[@ObligedTester]

Great info, thanks! Any recommendations for OP-amp?

[@HRTtwitch]

@@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.

[@yagneshpatel1183]

TL071 IS AUDIO IC NOT FOR INDUSTRIAL GRADE . BETTER SWITCH TO MCP SERIES IS BETTER

[@electronichannelgreece]

@@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

[@felipealves921]

lm6171 it's a good option

[@SemproniusDensusGaming]

I would like to see a video about CAN Bus Systems. Thumbs up for the video man

[@greatscottlab]

I can put it on my to do list

[@id15807936]

@@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.

[@krystian_rla]

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

[@crazyphil7782]

“One point five years ago” that had me laugh some

[@GreyDeathVaccine]

Nobody talks like that :-)

[@excitedbox5705]

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?

[@popcoron11]

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.

[@UtkarshAmitabhSrivastava]

5:43 only 10 bit DAC? Audiophiles are coming to get ya.

[@KingJellyfishII]

Not only audiophiles but just people who need accurate voltages for anything

[@power-max]

Thats what happens when you use an all-but obsolete microcontroller...

[@SpeccyMan]

@@power-max Spoken like a true ignoramus.

[@telefon72]

Having worked with audio at uni, I can say that 10-bit DACs will easily handle most music without any noticible noise. The thing you want is sampling frequency

[@UtkarshAmitabhSrivastava]

@@telefon72 True. But good luck telling that to an Audiofool who believes there equipment sounds better by using cryogenically frozen unobtainium power cable.

[@SimonCoates]

FY6800 DDS Signal Generator/Counter is amazing value for money - worth a look for anyone considering a budget unit.

[@Adrian_Finn]

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.

[@todayonthebench]

@@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.)

[@SpeccyMan]

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.

[@SimonCoates]

@@SpeccyMan You seem to be referring to the FY6600, not the FY6800.

[@todayonthebench]

@@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...

[@sanmvegs1641]

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

[@hafizdr]

I really like the way that you said when you "stole" his code to "save time and effort"

[@naknakacknak]

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.

[@lukaswalczak93]

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!

[@JatSingh]

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

[@trentjackson4816]

DIY will always be the ☆Winner☆ - for when it comes to test gear.

[@GarageScience]

A waveform generator has been on my want list for a very long time! One of the first comments!!!

[@pauljackson2126]

Finally, a project and a good lab instrument for Electronics Hobiests....

[@prashanthb6521]

I simply enjoy your videos even if I have no plans to build this circuit.

[@rogerfurer2273]

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.

[@salazar.eduardo]

Nice video! I'd like to see in a future DIY or buy episode an RLC meter.

[@electronichannelgreece]

Excellent work since 3 days I made this FUNCTION GENERATOR... I used the MT3608 DC TO DC CONVERTER to convert from 5v to 12v then I used the DDO315NA to convert from +12v to - 12v for the TL071CP.... I made the project with Arduino uno r3 atmega 328p!!!!FINE PROJECT!!! 😎😎😎😎😎😎

[@majidarabi3694]

Hi. Did you test function generator output signal with oscop? I made this circuit and connected to oscop as following resultes: - Frequency set to 2000Hz, sin and triangle wave frequency showing 2000Hz but on square wave showing 1000Hz. - Frequency set to 3000Hz, sin and triangle wave frequency showing 3000Hz but on square wave showing 1500Hz. square wave frequency always showing 1/2 of the set frequency.

[@electronichannelgreece]

@@majidarabi3694Yes I watched it!!!!

[@electronichannelgreece]

@@majidarabi3694 In theory a square wave has an instantaneous rise and fall. But it has a dwell time based on the frequency. Lets take a 1 hz square wave. The signal goes from zero to 100% in an instant. Then will remain at 1 for 1/2 of the wave length or 500ms.

[@majidarabi3694]

Thanks for your advise. I tried another function generator circuit diagram and code " www.instructables.com/Portable-Function-Generator-on-Arduino/" Sin,triangle and squre wave frequency are correct with that but with your circuit sin and triangle are corect and squre wave is 1/2. Fault finding is in progress.

[@electronichannelgreece]

@@majidarabi3694 I made this function generator with Arduino Uno R3 atmega 328p kzbin.info/www/bejne/qGHdq6R4YtSIfJY but if you watch my channel I made and ANALOG FUNCTION GENERATOR KITS BY E-BAY!!! I watched that and in Analog Function Generator kits by the Ebay the square wave has half past frequency than Sine and Triangle waves

[@sincerelyyours7538]

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.

[@v.vincent6631]

Simple and superb function genatator at cheapest prices..👌👌👌

[@frosty129]

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.

[@settwi]

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!

[@thelitecommando]

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).

[@albertomora4462]

It would be great to create a function generator with also sine sweep and random noise signals.

[@TheCalebf]

diy is always the winner as knowledge is priceless and indefinitely replicable

[@lensherman6242]

FY6800 from Banggood and others is about $90 US. 60MHz 20Vp-p output with a decent display and a normal case.

[@eulemitbeule5426]

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.

[@stevetobias4890]

Really like the DIY or Buy episodes

[@Twometer]

What kind of filament did you use for the box of your Function Generator? I really like how it looks

[@AstrobumTV]

Please do a video about whether should one build a diy 200MHz oscilloscope or just buy one.

[@Rolly369]

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$

[@ssschuh]

Just finished build and testing one (still prototype) and I have to say I don't see this signal instability at about 5MHz using my old analog scope connected at the 9833 output pin. Even being this the top frequency for my instrument. You probably was experiencing some other problem, not 9833's fault. I plan to build a second signal stage, so I can use it to extend sweep range frequency on my scopt, and (hopefully) observe its wave forms at higher frequencies. Anyway, thanks for sharing. Your videos are awesome!

[@nuk3man]

Hey, do you mind sharing your build or some tips/tricks? I'm having issues getting the entire thing to work. Nothing seems to happen when you turn the rotary encoder. Any ideas? The AD9833 does output a 1.04 kHz sine wave of

[@ritvarsrizikovs7117]

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!!!

[@Dragoby]

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!

[@laurentiudragomir1091]

Cezar Chirila, bravo si salutari!

[@bpbrainiak]

Always enjoy your videos! Saying hello from Santiago de Chile

[@RealCousinOkri]

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.

[@sageforce9306]

Next video: Space shuttle; DIY or buy😂😂

[@kingarthurthe5th]

We all know which option elon musk opted for ;)

[@danielstellmon5330]

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.

[@ninaddeshmukh654]

Ever time I see ur videos notification I hope for the drone video hoping the day comes soon

[@greatscottlab]

Not soon.

[@davidh1187]

So I found an old digital TV converter PSU that supplies +12, -12v and 5v (among others) as screen printed on the PCB BUT on measurement the 12v lines only measure + and - 11v. I assume this will still work for the rest of the design but limit the signal Gen to + and - 11v rather than the 12v you wanted.

[@SuperFredAZ]

You could easily have built the op amp offset for the 70 Euro commercial unit and saved so much work!

[@maciej_sliv]

TL071 is limited to 4Mhz, such a simple mistake...

[@JensRoland]

maciolos9 well spotted - any good alternatives he could use instead?

[@maciej_sliv]

​@@JensRoland plenty of them, google the high frequency LNA I love scott videos, but I'd like to see his projects successful. Even though these mistakes might be done to let audience think what has gone wrong, I personally would like to see a project done working properly.

[@JensRoland]

maciolos9 so maybe something like the NE5532?

[@maciej_sliv]

@@JensRoland Taking a quick glance - yes. Even fits for the non-differential input voltage purposes

[@holyboyarishnik9861]

2.5MHz in worst case

[@norm1124]

Danke für das Design, ich werde es wohl mit 2x 9V Batterien nachbauen.

[@eimparas]

heeey ! the ad9833 part you ued in easy eda , was made by me ! xaxax im proud tho see it fetured in your video !

[@greatscottlab]

Haha thanks for your good work :-)

[@eimparas]

im in the prosses to create my own fully digital controlable dds fg

[@electronic7979]

Excellent video. Very helpful

[@Hexor1211]

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.

[@johnford7847]

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.

[@StitchesLovesRats]

Mate, I gotta say, I frikkin love you for these instructable videos. I've already built an audio amp that works real good thanks to that vid and project page. You ever consider compiling a library that can be put on an internet in a box?

[@JoBo164]

I bought on ebay an old function generator for 30€. It has nearly the same functions as the diy one and is at some points better. I think this is the best and easiest way.

[@sarkam73]

Very good video You are great elektronik teacher

[@me3dnone107]

What do you need amplitudes >5V for on a frequency generator? I think for a beginner on low budget the XR-2206 is THE way to go!

[@jairguilhermecertorio6362]

Also, after the beginner gets fed up with the 5 Vpp he could just build an amplifying stage to get more Vpp and a bigger range for the dc offset.

[@vylbird8014]

Depends what you are doing with it. Someone who does vintage restoration, for example, will want the high-voltage, low-current signals used in valve equipment.

[@arafatal-gharabi7066]

Even though that it's difficult to understand but I like to watch your videos

[@lepidoptera9337]

A general purpose waveform generator is a rarely used lab instrument. If your circuit requires waveforms, it's best to design it with self-test in mind.

[@laurawerner]

This is a nice project. Thanks for the video! I'm going to build it! One question: The parts list in your Inventables article specifies a 24V center-tapped transformer. I thought the LM7812 and 7912 had a dropout voltage of around 2.5 volts, so to get +/- 12 volts you'd need to feed them at least +/- 14.5. Or basically a 30V center-tapped transformer rather than a 24V one. Those seem a lot harder to find, though Digikey has a few. What am I missing?

[@laurawerner]

A friend answered this question for me.... The 24V transformer outputs +/- 12V RMS so the peak voltage will be the 12 * √2, or around +/- 16V. More than enough. (If you couldn't tell, I'm a total beginner. I just started trying to learn electronics recently after retiring from a software engineering career.)

[@MCsCreations]

Fantastic work, dude! 😃 I may make one some day! 😃

[@sobertillnoon]

Holy crap. This video is perfect. I was just researching the xr2206

[@greatscottlab]

Thank you. Glad you like it :-)

[@FooBar89]

you already have an awesome function gen, no need to make a new function gen to solve this problem, just buffer and amplify the signals produced by your existing one

[@ahmedelmazaty9459]

Thank you for this project. I am looking for this for along time.

[@patkub2]

I don't know why somebody need that, just connect anything to 50Hz 230v sine wave generator, which is all around us.

[@DennisXiloj]

Lol

[@UberAlphaSirus]

But what if you want 51Hz?

[@cantekdemir1972]

@@UberAlphaSirus connect another plug in parallele lol

[@MIW_Renegade]

@@cantekdemir1972 now that would be amazing if that would work lol but I can see someone connecting 2 phases together and seeing the sparks fly as you short 2 120v lines (I used 120 in the example because I'm canadian)

[@SergiuszRoszczyk]

Shouldn't negative 12V linear regulator be enough for powering OP AMP? You don't take much power from output after all... This way some people would be kept away from high voltage.

[@peterlethbridge7859]

I have a question for you. Why would you by or make a dedicated waveform generator, if you could use the Wavegen function in your scope. I know some people won't have that option, but just curious as to why you'd use and external waveform generator over the inbuilt one. Great videos by the way.

[@mkbharadwaj4560]

09:09 and 09:11 And that's where ElectroBoom[friend of GreatSott] comes into play. LMFAO!

[@kekersdev]

What filament you used to print the housing?

[@greatscottlab]

Galaxy Black Prusament

[@kekersdev]

@@greatscottlab Thanks!

[@meepk633]

Could the distortion at the top end be solved with a better op-amp?

[@gglovato]

I was thinking the same, tl071 is like a 40yr old opamp by now. Probably better isolation and shielding of the signals would help toi

[@mborowski2010]

I was looking at the same expensive one you have the Siglent or whatever.. That with the Oscilloscope from the same company comes to about $800usd give or take. I love electronics and want to be like you when working with them so it would probably be best for me to buy the good one and learn everything it does, right? I still might build this anyway. Because the 4 channel Oscilloscope is more important to me for now.

[@cristianpal93]

Hello Great Scott can you tell me please the type of filament used for the 3d printed case?

[@greatscottlab]

I used galaxy black Prusament

[@JensRoland]

GreatScott! Thanks - great looking finish on that enclosure!

[@loganfansler9211]

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!

[@UpLateGeek]

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.

[@ortani]

I am inclined to believe you could not go much higher than 5MHz because of the op amp you are using. Did you try to test your project without the TL071 to see if the raw CI can work with a higher frequency? regards

[@Tommybotham]

What do you mean by “amplitude/offset adjustable”? Does amplitude adjustable = setting the voltage range? Does offset adjustable = setting an asymmetrical voltage range? Like starting from -5v and ending at +7v rather than strict -5v to +5v? To be honest, I’m struggling to see how amplitude and offset are exclusive.... why can’t you just choose your lower bound and upper bound with a maximum range of -12v to +12v? Edit: so offset determines whether you have AC (waveform must go above/below 0v sometime in the time period) or DC (all of waveform must be completely above or below 0v)? Please clarify and thanks for the videos.

[@paulperano9236]

Considering you used an OpAmp and lots of other stuff at the end, why not simply use the XR2206 with an inexpensive TDA chip to amplify the 2206 output ? Cheaper and easy to build. Use a multi position rotary switch to change the capacitor and a low value potentiometer you can have a reasonable range of frequencies. Toss in a cheap low frequency meter from good old Uncle Ali and BINGO ...

[@Ivor_Nastyboil]

An old PC power supply can be an excellent way of getting +12v, -12v and +5v. You also get +3.3v thrown in as an extra. They are easier to work with than a transformer for the less profficient tinkerer, especially if you use one of the cheap boards available from China that breaks out the voltages from the motherboard connector to the individual voltages and includes fuses.

[@hannescamitz8575]

Oooh! New colours of the markers!

[@DynoRC]

Nice project after a "while"

[@camarol88]

The TL071 (Figure 9 of datasheet = www.ti.com/lit/ds/symlink/tl072.pdf ) has a unity gain bandwidth of approx. 3MHz. With gain your bandwidth is lower, thus that might be the issue at higher frequencies.

[@abrarshams811]

So what can we used

[@camarol88]

@@abrarshams811 Use higher unity gain bandwidth opamp, although consider that this will come with an elevated price tag

[@__fdc]

At 5 MHz you are out of the Utility-gain bandwidth of the TL071 ( that's only up to 3MHz), and that's why it doesn't work as it should. A solution would be to use an Op-amp that can operates in all the bandwidth of the AD9833 ( like the LT1224 or someone else similar)

[@goofypettiger]

This was epic. Thank you for sharing it.

[@ranjiths7627]

Don't copy Do something different own New ideas Best explaination This is the reason, i wait for great Scott's videos 🥰🥰

[@catalinalb1722]

Next video should be on the topic GPSDO DIY or BUY

[@AlienRelics]

Ooh! Yes, I've been looking into this. Super accurate frequency counter, then use the same to make the sig gen super accurate.

[@alex-r2pi]

What would be needed to replace the analog pots by digital ones? E.g something like x9c104 just with fitting electrical parameters. I supose that would make an even more versatile device, or?

[@Drxxx]

amazing project, which filament did you used?

[@jacoblanctot2335]

Sweet! Thanks for making this. I think I can use something similar to this for my research doing phase shift keying.

[@BrentLeVasseur]

That box you printed looks nice! What 3D printer and materials did you use?

[@justas7463]

> Promotes JLCPCB. < Doesn't ever use it and rather builds his own circuits on a Veroboard. Good ol' Scott!

[@id15807936]

You don't need such services like JLCPCB as long as you stick to THT components and shields. But if you want to make your PCB small and use SMD components - that's where JLCPCB kicks in. You also can make some cool PCBs by using one of DIY technologies such as this one kzbin.info/www/bejne/mYfLhHZ7ha6Bpq8

[@PlasmaHarsh]

Hi I'm your biggest fan. I always wait for your videos💜💜

[@greatscottlab]

Thanks :-)

[@gudenau]

Oh my, the DDS is very clever. I like it.

[@MrRudyMurzyn]

I am using function generator, but the problem is that the output is very low power. I have been looking for amplifier that could work witch signals up to 1MHz, but I cannot find anything that can produce reliable signal, with current up to 5 A. I am an electronics hobbyist and I have problems with coming up with my own designs, but i want to learn by testing different circuit properties with my function generator. I found commercial amplifiers but these are still too expensive for me. Do you have any inputs on that topic?

[@xxycom8963]

@GreatScott! I wonder if you considered the reliable precise function generator IC Intersil 8038? The IC is low priced too. There are KZbin videos for it too.