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


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

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: 5978
Location: San Antonio, Tx, USA
Audio files: 258

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
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Joined: Dec 11, 2010
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Location: Toronto, Ontario - Canada
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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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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

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
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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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