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Old 26th November 2016, 03:45 AM   #1
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Default XR2206 function generator

Does anyone have any experience with this kit? I built it as a cheap function generator but I'd like to clean up the harmonics in the output. Am I hoping for two much from this cheap kit?Click the image to open in full size.Click the image to open in full size.


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Old 26th November 2016, 04:29 AM   #2
Enzo is offline Enzo  United States
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Are they consistent up and down the band? or they emerge as you climb or descend or something?

It is a bare bones very basic little unit. Are you running it off a super clean supply? The filter on the board looks minimal, possible coupling. I'd prefer it were in a metal box for shielding, but I doubt that it the issue.

Harmonics of 1kHz ought to be at 2k, 4k, 8k, etc. Your overtones are at 3k, 5k, 7k etc. So I don't know if that is a limitation of the chip, but then if your scope is digital, is it possible they are artifacts? Can you hear them? if you change the frequency, do you have them at similar relationship to the fundamental?
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Old 26th November 2016, 04:34 AM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by marc brown View Post
Does anyone have any experience with this kit? I built it as a cheap function generator but
I'd like to clean up the harmonics in the output. Am I hoping for two much from this cheap kit?
This chip uses diode shaping for the sine, it's not a low distortion circuit.
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Old 26th November 2016, 04:47 AM   #4
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Default XR2206 function generator

The supply is SMPS, I doubt its super clean. My spectrum analyzer is digital. I'm running it with a decent quality Behringer UCA-202 USB sound card. I figured the circuit was too simple to give good quality, even though I was crossing my fingers.

I don't want to spend a ton of money for a function generator as I don't use it a lot. I'm looking to replace my ancient Wavetek 188 which has a bunch of garbage in its output. I guess I could rebuild the Wavetek but not sure if it's worth it.

I'm trying to adjust my Technics SH-9010 equalizer so that I can sell it. To that end, I need a clean and accurate sine wave. I might resort to using my spectrum analyzer software to generate the sine waves.


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Old 26th November 2016, 04:56 AM   #5
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Is something like this better quality: https://www.ebay.com/itm/191787360703


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Old 26th November 2016, 05:07 AM   #6
rayma is offline rayma  United States
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Is something like this better quality
Looks like a better value, but it's probably a similar chip with similar distortion.
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Old 26th November 2016, 05:13 AM   #7
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Ok, thanks. I'll keep researching.


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Old 26th November 2016, 05:17 AM   #8
Ron E is offline Ron E  United States
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You could just use Audacity
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Old 26th November 2016, 07:41 AM   #9
Enzo is offline Enzo  United States
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You can buy an old HP 200 series audio oscillator for far superior results. Not expensive, and you could sell it for what you paid when you tire of it. That tends to be the difference between a "function generator" and an "oscillator." Performance.
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Old 1st December 2016, 01:17 AM   #10
PB2 is offline PB2  United States
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Analog function generators are designed for flexibility in waveform not for
purity in the sine output. What are your goals? Why not just use the
audio out from an old laptop? You can get a free digital function generator
program and it will provide reasonably low distortion.

fg_lite provides sine output, I've not measured the purity, perhaps give it
a try. It is not a true function generator since it doesn't provide square and
triangle output:
http://www.marchandelec.com/programs.html

Last edited by PB2; 1st December 2016 at 01:30 AM.
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