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xr 2206 vco ic
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zipzap



Joined: Nov 22, 2005
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PostPosted: Tue Mar 28, 2006 2:33 pm    Post subject: xr 2206 vco ic
Subject description: am movies + shematic
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Has anyone done something with this chip? it´s supposed to give tri/saw/sine and sqare over a wide range, it has symmetrie controll and the outputs can be amplitude modulated. I would like to know if the frequency changes when going from tri to saw (if thats possible). I post the datasheet, i must admit i don´t know that much about electronics (besides from building my little boxes), so i can´t realy "read" a datasheet.
This might be an easy and mor or less cheap (about 4$) way to get another vc-lfo/vca combination. Maybe a bit to easy for us diy-people. next step would be buying a finished module...


XR2206_EX.pdf
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Last edited by zipzap on Fri May 26, 2006 4:01 am; edited 2 times in total
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Pehr



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PostPosted: Tue Mar 28, 2006 11:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have a box with that chip in it Smile My father and I built it about 20 years ago Razz We used it like a vocoder, it really sounded cool! Making the voice robotic...

I can't figure out how to use it now 20 years later. I've tried and it just makes a sine or triangle wave...

I can try to scan the pcb if you like...

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Pehr



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PostPosted: Wed Mar 29, 2006 12:00 am    Post subject: Reply with quote  Mark this post and the followings unread

No, those DIN-jacks are not for MIDI Rolling Eyes
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zipzap



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PostPosted: Wed Mar 29, 2006 2:30 am    Post subject: Reply with quote  Mark this post and the followings unread

What a nice box. What are the inputs for? Everyone likes vocoder voices. would be nice to know what you did to that chip. did you somhow modulate the frequency or amplitude with an external signal (voice)? then mix the two signals? If you built this thing 20 years ago that chip propably exists for longer than me...
Well, what i thought would be interesting is how to use this chip for vco or vclfo modules. I would like to have a vco that can be modulated from tri to saw without changing the frequency. I´ve seen schematics that do that, but with lots of parts and lots of trimming. Looking at the datasheet it seems as this is not the general application for this chip, but maybe its possible, maybe f gets higher when going from tri to saw, f-saw being 2* f-tri. Maybe i just buy one and see what happens.
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Pehr



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PostPosted: Wed Mar 29, 2006 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

zipzap wrote:
What a nice box. What are the inputs for? Everyone likes vocoder voices. would be nice to know what you did to that chip. did you somhow modulate the frequency or amplitude with an external signal (voice)? then mix the two signals? If you built this thing 20 years ago that chip propably exists for longer than me...


Well, what I remember is that we connected a microphone to the IN and I suppose a speaker to the UT. I've tried that lately and I don't get the same result. I don't know but the IN can be for CV too...

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mosc
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PostPosted: Wed Mar 29, 2006 9:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Pehr wrote:
My father and I built it about 20 years ago Razz

I can't image building a DIY electronic circuit with my father. He did show me how to fix a stuck toilet one time. You are lucky... Very Happy

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Last edited by mosc on Tue Apr 04, 2006 6:52 am; edited 1 time in total
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toppobrillo



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PostPosted: Wed Mar 29, 2006 9:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey pehr i think i have this article from which this thing was made in .PDF. it is called 'Vocaphonie' from the elektor magazine and it is in french... i can't remember where i got it?? i have another voice effector using the 2206 also...

see these:


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Vocaphonie2.gif
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Vocaphonie3.gif
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Vocaphonie3.gif


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zipzap



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PostPosted: Thu Mar 30, 2006 1:25 am    Post subject: Reply with quote  Mark this post and the followings unread

this is great! No matter what the question, always something inspiering can be learned in this forum.
I´ll invest the 4 bucks and make some experiments. In the shematic i can´t read the numbers around the chip very well. Starting on the top left corner thats pin 13, 14, 4, ?, 3/5?, 2, 7?, 11, 12?, 10, 3?, 1?
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toppobrillo



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PostPosted: Thu Mar 30, 2006 2:06 am    Post subject: Reply with quote  Mark this post and the followings unread

hey, cool youre going to try it. let me see if i can attach the PDFs for you, they are very readable, if you read french [i don't but it's usually not too hard to get the general meaning].

here goes: hey i think it worked. check these out.

josh


Vocaphonie-1980.pdf
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Here is the simpler one..

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dnny



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PostPosted: Thu Mar 30, 2006 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

this chip looks nice and also the vocaphonie thingie.

made a Schematic Publisher component of XR2206

it looks like this - if you want it i can send you the .spt file
Posted Image, might have been reduced in size. Click Image to view fullscreen.

dnny

Last edited by dnny on Mon Apr 03, 2006 9:59 pm; edited 1 time in total
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Pehr



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PostPosted: Thu Mar 30, 2006 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

topp wrote:
Hey pehr i think i have this article from which this thing was made in .PDF. it is called 'Vocaphonie' from the elektor magazine and it is in french... i can't remember where i got it?? i have another voice effector using the 2206 also...

see these:


Yes, that one must be it! Too bad that the pdfs are in french. I guess that this project also was in a swedish magazine "Allt om elektronik" or something. Good that I now know the name, there's always google Cool

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Uncle Krunkus
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PostPosted: Thu Mar 30, 2006 1:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

French isn't enough to stop me from being able to build it. Arabic, or maybe Japanese, that might be a different story.
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dnny



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PostPosted: Mon Apr 03, 2006 11:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

nescivi has done a nice tennisball synth whit XR2206 chip
take a look

nescivi´s page

here is the ballsynth whit FSR ( force-sensitive resistors/pressure sensors)
Posted Image, might have been reduced in size. Click Image to view fullscreen.

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mosc
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PostPosted: Tue Apr 04, 2006 6:51 am    Post subject: Reply with quote  Mark this post and the followings unread

dnny wrote:
nescivi has done a nice tennisball synth whit XR2206 chip
take a look


Quite cool. Cool

You know Nescivi is a member here. We got class... Very Happy

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zipzap



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PostPosted: Tue May 23, 2006 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, some time has passed, i still haven´t built the robot voice yet, but at least i started experimenting with the chip today.
It´s quite promising, the range is huge and you can fade between triangle and sine. Very handy, only a few parts are needed. I have to find a way to get good voltage controll now. ´ll tell you what i find.
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zipzap



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PostPosted: Wed May 24, 2006 2:47 am    Post subject: Reply with quote  Mark this post and the followings unread

I somehow managed to get some kind of voltage controll, guided from the french pdfs. all rs are 1k, the cv is 0-10v. The pot tunes the whole thing. Higher CV means lower pitch. using an inverting opamp didn´t work.
Notice the collector is not connected. If i put it to +12v nothing is working, if i put it to ground the range is a bit smaller, like this it works the best.
What am i doing here? This can´t be the way to do it. Also v/oct would be nice of course.


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mosc
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PostPosted: Wed May 24, 2006 8:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Looking at the schematic, pin 7 is expecting a current source to work best. A resistor can work as a current souce. If you want something simple, try building some sort of vactrol thingie. I don't think this chip is the best route to a high quality 1v/octave VCO though. The way you have the NPN transistor hooked up, it is a diode.
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zipzap



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PostPosted: Wed May 24, 2006 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

A Diode! I found that out myself in the meantime, but thanks.
Guess you´re right about the vactrol. Must be the easiest way. The difference between current and voltage - yes there was something...
Anyway, in the datasheet it says that the frequency is in linear relation to the current flowing from pin 7 to ground or -12v in this case.
I found some page saying this ic could be turned into a linear or exp vco. Unfortunately it didn´t say how...
Would be nice though, i´ve got a number of nonlinear vco things already.
Anywhich way i do it, it´ll sure make a good vc-lfo. I hooked up a huge cab and had minute long sinewave circle with no amplitude loss.
Also, as i said you can adjust anything from sine to triangle. Set to saw and sine at the same time also is interesting.
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zipzap



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PostPosted: Wed May 24, 2006 11:43 am    Post subject: Reply with quote  Mark this post and the followings unread

I just read through mountains of maillinglist text.
Already 10 years ago everyone was saying that this ic is hard to controll and will not make a good tracking vco. You already told me...
So i´ll build a LFO....
Someone also wrote this, sounds interesting:
BTW one thing these chips ARE good for is as the VCO in a phase locked
loop at audio frequencies, this enables you to get a sine or triangle or
square from really shitty waveforms.
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zipzap



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PostPosted: Wed May 24, 2006 12:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I wish you could see my scope! I just discovered the possibility of amplidude modulation and spent the last hour watching winding snakes, flowing geometric figures, dancing clouds and all.
Pin 1 of the ic is used fore am. What´s really cool is that it works in both ways like a ringmod. At 0v amplitude is 0. It rises with the voltage and is inverted depending on the polarity.
So an envelope going from 0v to about 10-12v can be used for instant drum sounds. Another osc centered around 0 will make a huge mess and some nice movie on the scope. especially like a pwmodded square for the am source.
handy ic, only a small hand full of parts needed. Think i could build a drummachine out of a couple of those.
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PostPosted: Wed May 24, 2006 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

zipzap wrote:
Think i could build a drummachine out of a couple of those.



I'm sure you can.

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PostPosted: Wed May 24, 2006 10:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

i recall seeing a circuit of thomas henry's using the 566 VCO IC where he powered it with -v and ground, instead of gound and +v, making the 'timing capacitor' pin a current sink, so as to use an expo to source it current... and the linear cv input was just biased by resistors. i don't know anything about the 2206, maybe it could be done the same way.
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zipzap



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PostPosted: Thu May 25, 2006 6:58 am    Post subject: Reply with quote  Mark this post and the followings unread

already put the vactrol in. I set it up so it can be adjusted from 10k to 560k. Big frequency range and the led is never dark and never at max brightness so it´s reacting not too slow.
Anyway, if you like to hear it than listen to the sample. Small sequence with and without AM by another osc.
The AM seems to be not very useful for envelopes, because i didn´t manage to get the thing to shut up completely.
They say in the datasheet that you need a well regulated psu, because the amplitude is a function of the supplied voltage. It´s supposed to be quiet at the exact center which in my case didn´t work.
Maybe it´s ok for lfo am, but not for drums. luckily there is the 13700.
Edit: The sample was too big and i needed the space. So i removed it. It sounds like a ringmod (in fact it works like a ringmod).

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Last edited by zipzap on Fri Aug 11, 2006 8:06 am; edited 1 time in total
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dnny



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PostPosted: Thu May 25, 2006 9:13 am    Post subject: Reply with quote  Mark this post and the followings unread

sound's good to me!
i have one xr2206 - so now i know what to do whit it - thanks

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PostPosted: Thu May 25, 2006 10:54 am    Post subject: Reply with quote  Mark this post and the followings unread

dnny wrote:
sound's good to me!


Me too

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