Function/Waveform Generator || DIY or Buy

You can get the commercial function generators here (affiliate links):

Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:

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

Music:
2011 Lookalike by Bartlebeats

[alenasenie]

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

Electroboom disaproves

[ZoniaTV]

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

[Dak]

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

[skittermckitter]

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.

[mackdlite]

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

[UP.electronic]

I saw a lot of different videos on YouTube 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 :)

[Miata]

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

[innovationu]

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

[lukahierl]

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

[SemproniusDensusGaming]

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

[GarageScience]

A waveform generator has been on my want list for a very long time!

One of the first comments!!!

[blackwingmaster]

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

[SimonCoates]

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

[popcoron]

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.

[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

[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!

[excitedbox]

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?

[crazyphil]

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

[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

[salazar.eduardo]

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