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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Complex Waveform Generator Using 40106
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gasboss775



Joined: Jan 02, 2016
Posts: 217
Location: Scotland

PostPosted: Sat Mar 04, 2017 1:44 pm    Post subject: Complex Waveform Generator Using 40106 Reply with quote  Mark this post and the followings unread

Another way of making a VCO with the 40106 is to vary the supply voltage. The relationship is far from linear and is also inversely proportional, that is the output frequency falls as the supply voltage is increased.
The other issue is that of the output amplitude varying with control voltage, if you are using the squarewave output it is easy to convert to a fixed output using 1 npn transistor as a switch, if you wish to utilise the saw / tri waveform on the capacitor this can be corrected with a subsequent vca. I used the six schmitt triggers toghether feeding a diode clipper to produce a complex atonal sound.

As I recall the R & C values around the six Schmitt trigger oscillators were the same as in the TR606 drum machine. If anyone needs the values I can look them up.
see below:


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BlacKcaT



Joined: Dec 08, 2016
Posts: 25
Location: Italy
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PostPosted: Sat Mar 11, 2017 11:15 am    Post subject: Re: Complex Waveform Generator Using 40106 Reply with quote  Mark this post and the followings unread

oooh this looks nice!
Looking forward to see the R and C values for the six Schmitt triggers ! Maybe could be interesting to put there Pots. Smile



gasboss775 wrote:
Another way of making a VCO with the 40106 is to vary the supply voltage. The relationship is far from linear and is also inversely proportional, that is the output frequency falls as the supply voltage is increased.
The other issue is that of the output amplitude varying with control voltage, if you are using the squarewave output it is easy to convert to a fixed output using 1 npn transistor as a switch, if you wish to utilise the saw / tri waveform on the capacitor this can be corrected with a subsequent vca. I used the six schmitt triggers toghether feeding a diode clipper to produce a complex atonal sound.

As I recall the R & C values around the six Schmitt trigger oscillators were the same as in the TR606 drum machine. If anyone needs the values I can look them up.
see below:
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gasboss775



Joined: Jan 02, 2016
Posts: 217
Location: Scotland

PostPosted: Sat Mar 11, 2017 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Iam currently working on a better version of this. However if you want to try out the circuit I posted here is a chart with the RC values:


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BlacKcaT



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PostPosted: Mon Mar 13, 2017 10:34 am    Post subject: Reply with quote  Mark this post and the followings unread

gasboss775 wrote:
Iam currently working on a better version of this. However if you want to try out the circuit I posted here is a chart with the RC values:



Thanks!
I'll give it a try Smile
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gasboss775



Joined: Jan 02, 2016
Posts: 217
Location: Scotland

PostPosted: Wed Mar 15, 2017 3:21 pm    Post subject: New design Reply with quote  Mark this post and the followings unread

This is the current state of development of the new complex waveform generator. There will probably be some changes. I was thinking about replacing one of the oscillator pots with a vactrol to allow voltage control of the oscillator frequency, say from an LFO or Envelope Generator.

Any questions or comments are welcomed. Smile

EDIT: in the first posting of this schematic R10 was omitted in error. This has now been corrected


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gasboss775



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PostPosted: Wed Mar 22, 2017 3:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Now with added CV mixer. In case anyone is wondering why I used an inverting mixer, it is because the oscillation frequency of the Schmitt trigger oscillators is inversely proportional to the supply voltage.

Note that the lm358 is powered from a single +12 V supply NOT +/- 12 V


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gasboss775



Joined: Jan 02, 2016
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PostPosted: Tue Mar 28, 2017 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Have gotten good results with keeping the 4093 voltage fixed ( @+12V ) and using a 4046 as a 5th oscillator ( voltage controlled ) and XORing the 4046 output with the output of the 4093/4077 combo.

See attached schematic ( still to include VCO CV mixer )


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gasboss775



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PostPosted: Thu Mar 30, 2017 8:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Now with CV mixer for the 4046 VCO:

Q1, R13 & R14 are just a buffer ( inverting ) to drive the electrolytic capacitor & pot ( I think Tue outputs of the XOR gates might have struggled to do this alone )

Q2, R15 & R16 is a buffer to the next stage. Not sure what last stage should be yet, some sort of filter?


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gasboss775



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PostPosted: Sat Apr 01, 2017 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

I have been gathering together all my old hand drawn schematics on this concept/project, the design of which I've been working on since around 2011~12 ( didn't put dates on everything, much to my annoyance ) I'm going to have a good look at these schematics before deciding on the best direction for this project as there are 3 or 4 different directions I could take with this.
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Mon Apr 03, 2017 9:06 am    Post subject: Reply with quote  Mark this post and the followings unread

I really should try breadboarding these, they all look very interesting and I have some space for a couple more lunetta circuits.
I do have some other things I should finish first though. Did you happen to record any sounds ?

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gasboss775



Joined: Jan 02, 2016
Posts: 217
Location: Scotland

PostPosted: Mon Apr 03, 2017 1:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
I really should try breadboarding these, they all look very interesting and I have some space for a couple more lunetta circuits.


Thanks for your appreciation, Iam mildly in awe of your considerable innovation.

Quote:
I do have some other things I should finish first though. Did you happen to record any sounds ?


Not yet, but I was planning to.
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okelk



Joined: May 08, 2014
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PostPosted: Tue Apr 04, 2017 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

I played with some drum circuits where a schmitt trigger IC was powered by a buffered decay-generator a while ago.

I just wanted to note that to my surprise the 40106 chips behaved very differently from the 74HC14 I used (both running on max. 5v).

The 74HC14 behaved very much as I expected while the sounded like it had a hick-up. (not useful in that case, interesting nonetheless)

Have you experienced something like that?
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gasboss775



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PostPosted: Tue Apr 04, 2017 4:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

okelk wrote:
I played with some drum circuits where a schmitt trigger IC was powered by a buffered decay-generator a while ago.

I just wanted to note that to my surprise the 40106 chips behaved very differently from the 74HC14 I used (both running on max. 5v).

The 74HC14 behaved very much as I expected while the sounded like it had a hick-up. (not useful in that case, interesting nonetheless)

Have you experienced something like that?


Possibly yes when the supply to the 40106 went below 3 volts, the 74hc will probably work at a little under 2 volts ( the recommended minimum being 2 V )

I haven't tried this with a 74hc14 but I do have some so might try it.
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okelk



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PostPosted: Thu Apr 06, 2017 5:49 am    Post subject: Reply with quote  Mark this post and the followings unread

gasboss775 wrote:
okelk wrote:
I played with some drum circuits where a schmitt trigger IC was powered by a buffered decay-generator a while ago.

I just wanted to note that to my surprise the 40106 chips behaved very differently from the 74HC14 I used (both running on max. 5v).

The 74HC14 behaved very much as I expected while the sounded like it had a hick-up. (not useful in that case, interesting nonetheless)

Have you experienced something like that?


Possibly yes when the supply to the 40106 went below 3 volts, the 74hc will probably work at a little under 2 volts ( the recommended minimum being 2 V )

I haven't tried this with a 74hc14 but I do have some so might try it.


Yes, I'm talking about how it behaves under the recomended voltages...
The 74hc14 is rated for 2v, but works more or less even on lower voltages...and at some point it just stpps working.
the 40106 on the other hand not just stops working under a certain voltage, it just starts doing...weird stuff...

I guess it makes sense to use a 15v power supply like you do...that way you have much more range than in my experiments with a 5v supply...
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gasboss775



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PostPosted: Thu Apr 06, 2017 8:59 am    Post subject: Reply with quote  Mark this post and the followings unread

okelk wrote:
Yes, I'm talking about how it behaves under the recomended voltages...
The 74hc14 is rated for 2v, but works more or less even on lower voltages...and at some point it just stpps working.
the 40106 on the other hand not just stops working under a certain voltage, it just starts doing...weird stuff...


Yes, I think that I experienced that. I had designed my circuit so that the voltage going to the 40106 couldn't go below 3 volts.
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gasboss775



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PostPosted: Mon Apr 10, 2017 3:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you feed the combined outputs of oscillators 1-4 ( point D ) into the CV mixer feeding the 4046 the output of the 4046 is quite like white noise, though with the ability to "tune" it using the pot also feeding the CV mixer.
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gasboss775



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PostPosted: Tue Apr 11, 2017 3:48 pm    Post subject: Metallic Percussion Voice Reply with quote  Mark this post and the followings unread

Here is a practical application of the complex waveform generator ( well a part of it anyway )

It is a metallic percussion voice, that I breadboarded today. I haven't made a recording yet but I could if anyone's interested.


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gasboss775



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PostPosted: Wed Apr 12, 2017 5:06 am    Post subject: Offshoot project - Cowbellish Drum Reply with quote  Mark this post and the followings unread

I stumbled upon a little offshoot idea using parts of the above circuit still on breadboard. Inspired by the legendary TR808 cowbell.

THE COWBELLISH DRUM!
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gasboss775



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PostPosted: Fri Apr 21, 2017 1:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

I came up with an alternative scheme for the generation of complex waveforms. So far I've only tried it on the simulator, but it should work. I keep forgetting to breadboard it.

Here it is:

Just in case anyone was unsure, the rectangular blocks with =1 in them are XOR gates, these are part of an alternative system of symbols for logic gates.


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