I hope you enjoyed reading this guide. Feel free to email me or leave a comment below if you have any questions and I'll try my best to help you out.
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Written by justDIY on 2007-01-05 07:13:50
nice!
I'll have to add this to my growing list of things to build.
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very nice! =)
Written by khoa on 2007-01-05 08:34:53
I really enjoyed this guide, I remember building something like this w/ a function generator IC in a class, but you've put it together so nicely. .....Now I need to find an affordable o-scope.... |
own project
Written by ubuntu12 on 2007-01-06 03:27:03
I have an exar 2206 project in a box on my workbench right now. I used 5 capacitors and a 10k pot so I could select ranges like an real function generator, 10Hz - 100Hz, 100Hz - 1kHz , ... etc
I found the data sheet helpful with the design but I am having problems with the amplitude. I am not getting full amplitude swing. I am getting around 2.4v for the triangle wave output. All the other functions work ok.
How much amplitude did you get out of this thing?
I am running vcc at 24v with the split running at 12v. So I sould have a swing of plus or minus 12v. |
Re: Ubuntu12
Written by nuxie1 on 2007-01-06 06:11:53
Do you get a full voltage swing for the square wave output? The voltage swing for the triangle/sine output is dependant on the resistance through Pin 3, as in Figure 3 of the datasheet. You can't get above 50% of your input voltage rails for either sine or triangle outputs.
I can get up to a 40% voltage swing compared to the input voltage.
Cheers. |
Synth
Written by Charles on 2007-01-06 15:34:21
The project looks pretty cool... do you think this could be suitable for something like a synthesizer if the R and C for the f0 where controlled by some logic circuit? (at least the R)
Great job overall |
voltage swing
Written by ubuntu12 on 2007-01-06 18:05:28
I get less than 2.4v voltage swing for the sine and square wave outputs.
I also note that pot R3 on the data sheet can vary the output 160mV/kOHM for triangle and 60mV/kOHM for sine wave. I used a dual gang 25k pot switched with S1 to compensate for output difference. eg they are switched into series for the triangle output and one 25k pot used for the sine wave output.
It is good to know that you got 40% swing of the rails. Now I have some thing to aim for.
Thankyou Nuxie1
Synth : NO this XR2206 has a FSK feature that can switch only between two frequencies. Once you put logic switches in series with the R and C values your f will become very hard to calculate. I get f varying because of the inductance from my wires plugged into my breadboard. I also put a big inductor between pin 1 and ground to clean up some noise. |
Components
Written by Martin on 2007-01-08 09:38:11
Have you a component list I'm keen to make the circuit but am unsure of what types of capacitor I need to buy I think they are mainly electolitic but what voltage do I need to get. I have got a breadboard so can build on that. |
RE: Martin
Written by nuxie1 on 2007-01-08 10:23:34
The polarised capacitors are all electrolytic, the other two are ceramic/tantalum.
The voltage rating should be about 1.5x the input voltage (at least). I used mostly 50V electrolytics.
I'm working on a revised version at the moment that has the pots mounted on the board directly, and is a bit better laid out. |
Incorporate Atmel Controller
Written by Teque5.com on 2007-01-09 21:34:30
I think ill pick up the parts to build this little gem pretty soon. I was thinking i would integrate a microcontroller to run the switches so i can just dial in a frequency and use a switch to select square/sin/saw. In any case - nicely done! |
Amplify it
Written by TenGees on 2007-01-16 19:29:54
I saw several circuits for the XR2206 many years ago and I built a few, one with a frequency counter to show what the circuit was putting out. Most designs had amplifiers (transistor or opamp) on the outputs of the sine and triangle and cmos buffers for the square out. |
pc boards
Written by ag4yq on 2007-02-20 10:40:54
I am very interested in your divice. Do you have a source for the circuit board for this project?
I have considered building it on a ground plane, any thoughts? |
RE: ag4yq
Written by nuxie1 on 2007-02-20 22:40:42
The Eagle design files can be found on page 4. I am working on a better version, just been held up a bit with other things.
Building it on a ground plane should work, might just be a bit messy. |
my comments
Written by pinoy me on 2007-03-01 03:17:40
i owe you a lot for this circuit. somehow you help me indirectly in my project. thank you. |
Good..
Written by Sardar G on 2007-03-04 02:40:13
This guide has made a great support for my EC-II project.
Thanks for sharing such a Great info. |
tech
Written by roger on 2007-03-05 09:43:04
An interesting piece of work!
I have a analog/digital trainer PAD-234A
from tech school. If you are interested in schematics. |
Written by nuxie1 on 2007-04-05 10:49:45
Hi Roger, it would be great if you could link/send me the schematics for your trainer. Please contact me through
This email address is being protected from spam bots, you need Javascript enabled to view it
Sardar, I'd be interested to see the info on your EC-II project. |
yo
Written by pai on 2007-03-07 06:55:37
man thank u for ur info im actually desgning a functio0n genratopr for my assignemnt, this pice of work is going to simplify my assignement thank u peace |
3D PCB ?
Written by Giacomo on 2007-03-28 11:32:11
Hi nuxie1, I found your project since I'm doing a similar one and you clarified something to me.
An important question (to me!): which Sw do you use for 3D PCB rendering ??
This is something I always loved but I can't find. I normally use EAGLE for my projects.
Thanks |
Written by Mark Shenouda on 2007-04-04 12:42:53
hi
i really liked the idea of the function generator and i am planning to build one .. but i have some questions in the schematics .. i cant undesrtand it all ... some components as LEDR and R! R2 R3 r those resistors or just headers and the places of the outputs is not clear in the eagle .. i am a biginner so its kinda hard for me .. so can u send me more clear schematics or detailed explaination for it .,, i would be so thankful ...
thanks
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Written by nuxie1 on 2007-04-05 10:45:01
Eagle3D is used to make the 3D renders.
LEDR and R? are all resistors. If you download Eagle and open the schematic it should be more clear. |
alternatives to the xr2206
Written by Dave on 2007-04-25 22:48:37
The xr2206 is a nice chip, but seems to be out of production nowadays. So are other comperable function generators like the MAX038, XR8038, NE566, etc. Do you know of any modern comperable chips? Thanks |
a problem
Written by solom on 2007-04-28 02:17:39
The xr2206 is a nice chip but ican't found it can you help me please |
Written by nuxie1 on 2007-04-28 02:28:23
I'm not sure of other comparable chips, most seem to be DDS type ones now.
I am trying to track down a good source for them and order some to sel individually and for my function generator kits.
I'm trying to vastly improve on the ease of use from this first design, make the board larger and better laid out. However at this stage it probably wont be available till June/July unfortunately. |
Written by Dave on 2007-04-29 22:13:36
as an update, you can still get the xr2206 on Jameco, i've found. |
Function Generator Output.
Written by Hank Klapheke on 2007-06-02 20:22:50
The function generator needs an output stage.
try; www.elenco.ws.manuals/xk-700k.pdf
www.elecfree.com/electronic/xr-2206-
function-generator/ |
i'm building one of these, thanks!
Written by chr0n1c on 2008-06-10 15:34:37
i recently came across your project, i have the eagle files downloaded and i'm waiting for my pcb stock to get shipped. i also wanted to mention that i just found the xr2206 on jameco.com as of 5 minutes ago. do you mind if i host the g-code to mill/drill the boards with EMC2 on my website? thanks for the neat project for my mini cnc mill. --chr0n1c / ohiopctech.com |
Audio frequency generator
Written by James on 2008-06-17 04:39:21
Dear nuxie 1, I am trying to make an audio frequency(20Hz-20Khz) generator with a potentiometer frequency changing control.
I need sine, square, triangle and sawtooth waves. Is the XR2206 a good basis for this?
Regards James |
