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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Voice Modulated 40106 Oscillato
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Stream Operator


Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267

PostPosted: Mon Aug 22, 2011 9:21 am    Post subject: Voice Modulated 40106 Oscillato
Subject description: Simple Modulation Technique (FM)
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Hi all, I've come up with a way to modulate a 40106 oscillator (FM) using only two additional parts: a resistor and a capacitor. See the circuit below.

On the left is a microphone amplifier circuit. It's just two opamps in series, AC coupled, amplifying the weak signal of the mic, which is one of those little mic elements you can get for a breadboard or circuit board. That's all standard stuff, or my version of it, but what is really interesting is the 40106 modulation.

See the right part of the diagram. All you have to do is lift the ground lead of the capacitor and put a shunt 10k resistor and a seris 0.1uF input capacitor and drive it with a low impedance source - tada! Frequency Modulation!

I'm going to describe the circuit during this week's Les Hall Show, so tune in for a real treat (not to mention the way cool circuit that the osc is driving).

Les


Voice Modulated 40106 Oscillator.jpg
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the schematic
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Voice Modulated 40106 Oscillator.jpg



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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267

PostPosted: Mon Aug 22, 2011 10:25 am    Post subject: Reply with quote  Mark this post and the followings unread

At the request of PHOBoS in chat, here is a more readable schematic. Enjoy!

Les


VMOSC.jpg
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the schematic
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VMOSC.jpg



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Cynosure
Site Admin


Joined: Dec 11, 2010
Posts: 966
Location: Toronto, Ontario - Canada
Audio files: 82

PostPosted: Tue Aug 23, 2011 5:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great stuff. I can see this being very useful.

Any suggestions for modifying an external sound source using a mic? Kind of like a vocoder, but but just using the level to control a filter?
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Stream Operator


Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267

PostPosted: Tue Aug 23, 2011 10:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well you can use it as a clock to other circuitry and then your other circuitry will also be voice modulated, that would be the main use. I found that doing so works if you keep the frequency unmodified, but as you divide down the frequency the voice signal fades. This makes sense as binary dividers have the feature of removing duty cycle variations.

Also it opens up the possibility of using a switched capacitor filter, something which I have not seen discussed here. Perhaps we should look into those circuits.

Les

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kaputtpanzer



Joined: Nov 02, 2009
Posts: 139
Location: Cologne
Audio files: 15

PostPosted: Sat Sep 03, 2011 3:12 am    Post subject: Reply with quote  Mark this post and the followings unread

works great Very Happy
Thank you for sharing the schematic
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J-14



Joined: Dec 28, 2017
Posts: 1
Location: La Paz, Bolivia

PostPosted: Thu Dec 28, 2017 3:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great circuit! Thank you!

I was wondering how can I use the output of a guitar instead of the microphone.
I am thinking of removing the 0.1 capacitor and the 10K resistor of the mic and connecting the guitar. Is it possible?
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stolenfat



Joined: Apr 17, 2008
Posts: 476
Location: Sunny Oakland California
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PostPosted: Thu Dec 28, 2017 10:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

J-14 wrote:
Is it possible?



Only one way to find out!


I'd suspect it would 'modulate' but I wouldn't expect much musical correlation, but perhaps i'm wrong. You could always just mic an amp, no?

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gasboss775



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

PostPosted: Fri Dec 29, 2017 3:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

This is interesting. I've been trying to decide whether to use Schmitt trigger oscillators or 555's to make a drone synth, this scores a point in favour of the Schmitt trigger oscillators. Will need to try it out.
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 267

PostPosted: Sat Jan 27, 2018 5:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, I just popped in after a Christmas hiatus and I'm pleasantly surprised to rediscover this post. Right now I'm 3D printing some "paper" airplanes (they are plastic versions of an iconic 1970's paper airplane).

Then there is the remaining list of projects. Long story short, I'm reexamining the list of projects and I'd like to add one music project to the list. This circuit could be the one.

I like breadboarding quite a lot as regular posters and readers may recall. Now with 3D printing I can make custom breadboards. Also I've thought of delving into the freeform art with a 3D printed accessory object. All very interesting. Does anyone have interest in this direction?

Les

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