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Old 12th February 2013, 07:44 PM   #11
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I made some generators using theese a lot of years ago.
They are relatively dependant of a GOOD layout, and as one already said: Poor output impedance. Let it have a good bufferamp, and You will be better off.
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Old 12th February 2013, 08:43 PM   #12
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Hi Sakis
That glitch is inherent in in all simple 2206 sinewaves.
Elektor Function Generator generator from ~1980 had the same issues, even as a complete and well built instrument.
The problem is with switch and lead capacitance at pin 13 and the solution they used in a revised circuit, was to fit a very closely wired BS170 mosfet switching device. I hope you will know how to wire that up, because I can't recall all the details of what voltage was used.

EDIT: This might help: http://www.granta.g4axx.com/pdfs/Generator.pdf

Good luck and
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Last edited by Ian Finch; 12th February 2013 at 09:13 PM.
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Old 12th February 2013, 09:02 PM   #13
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XR2206 never able to give the correct forms.

Although with time to work.

Regards zeoN_Rider
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Old 12th February 2013, 10:06 PM   #14
wahab is offline wahab  Algeria
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This IC was meant for easy build of a basic functions generator ,
good for its waveforms versatility but average not to say mediocre
performances wise.
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Old 12th February 2013, 10:31 PM   #15
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Here you go, seeing that this is for visual aspects of audio, a video of an XR2206 generator should be just right. We expect you to at least match this one...

DIY XR2206 Function generator - YouTube
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Old 12th February 2013, 11:07 PM   #16
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I got a clean 100khz square wave from a cmos tlc555 + totem pole.
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Old 13th February 2013, 08:14 AM   #17
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Topward 8110 is also based on xr2206 now this is a rel. cheap instrument of about 250 euro but its decent enough ( i own one )

so xr 2206 is fine we just need to know how to operate it it properly

Thanks Ian will look in to it and get back to you

kind regards
sakis
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Old 13th February 2013, 11:25 AM   #18
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Though square waves are poor past 20khz compared to a TLC555 wired as a schmitt trigger astable oscillator.
I use XR2206 for sinus, and Schmitt trigger for square.
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Old 13th February 2013, 11:35 AM   #19
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Schmitt trigger TLC555
Attached Images
File Type: gif NE-555-FIGURE27A.gif (2.9 KB, 72 views)
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Old 13th February 2013, 03:27 PM   #20
Hengy is offline Hengy  Canada
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This might be a very wrong answer.. someone else will have to confirm, or if you have the parts it wouldn't be hard to try.

A schmitt trigger on the output might give you 'sharper' output. A high-speed opamp in a buffer config will give a low impedance output.

I would recommend the 555 timer-based oscillator that bobodioulasso posted. Simple and effective.

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