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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
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guitarfool
Joined: Feb 26, 2007
Posts: 161
Location: Maryland
Audio files: 8
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 Posted: Fri Sep 26, 2008 5:46 pm Post subject:
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Very exciting! I don't believe anybody has every done anything other than a triangle core TZVCO. Scope shot looks right with the phase reversal  |
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jnuaury
Joined: Feb 28, 2008
Posts: 161
Location: chicago
Audio files: 9
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| Posted: Fri Sep 26, 2008 6:10 pm Post subject:
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wowzas!
when you say simple... is it a low parts count too? or just simple in implementation? im imagining a stack of 4 or so of these...... |
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Peake
Joined: Jun 29, 2007
Posts: 1113
Location: Loss Angeles
Audio files: 3
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| Posted: Fri Sep 26, 2008 7:11 pm Post subject:
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If sine waves (or triangle core oscillators shaped to sine) produce FM such as the DX7 (or roughly equivalent), then would this, saw shaped to sine, sound different?
And mp3s please!
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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog |
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Scott Stites
Janitor
Joined: Dec 23, 2005
Posts: 4127
Location: Mount Hope, KS USA
Audio files: 96
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| Posted: Fri Sep 26, 2008 7:17 pm Post subject:
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| Quote: | | would this, saw shaped to sine, sound different? |
I think it would be extremely cool if it did, not that I would kick it out of bed for eating crackers if it didn't......
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yusynth
Joined: Nov 24, 2005
Posts: 1314
Location: France
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| Posted: Sat Sep 27, 2008 1:40 am Post subject:
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Interesting, I look forward to seeing more !
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EdisonRex
Site Admin
Joined: Mar 07, 2007
Posts: 4579
Location: London, UK
Audio files: 172
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| Posted: Sat Sep 27, 2008 2:40 am Post subject:
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That looks quite unique. If it's simple in design, that would be encouraging too.
Hope you write more about this, Ian.
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Home,My Studio,and another view |
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usw
Joined: Mar 22, 2007
Posts: 27
Location: valence france
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| Posted: Sat Sep 27, 2008 3:43 am Post subject:
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| what's the modulator's waveform in the scope sample ? |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sat Sep 27, 2008 9:04 am Post subject:
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| usw wrote: | | what's the modulator's waveform in the scope sample ? |
It's a sinusoid.
I'm currently working on improving the implementation before more careful characterization. Right now it has 8 opamps plus the OTA. Two of the opamps are for deriving the correct time-reversed waveform from what comes out of the core (which is an interesting signal on its own.)
Ian |
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bridechamber
Joined: Oct 06, 2007
Posts: 64
Location: Saint Paul, MN
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| Posted: Sat Sep 27, 2008 12:04 pm Post subject:
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Drooool............
: )
I'll take ten!
Scott |
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neandrewthal
Joined: May 11, 2007
Posts: 672
Location: Canada
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| Posted: Sat Sep 27, 2008 1:14 pm Post subject:
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| bridechamber wrote: | Drooool............
: )
I'll take ten!
Scott |
That's not enough for everyone  
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Junk Rhythm
Joined: Jan 07, 2008
Posts: 81
Location: San Francisco, CA
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| Posted: Sat Sep 27, 2008 8:51 pm Post subject:
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| Peake wrote: |
And mp3s please! |
 Oh yes please. |
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usw
Joined: Mar 22, 2007
Posts: 27
Location: valence france
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| Posted: Sat Sep 27, 2008 11:46 pm Post subject:
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| are the improvements you mention (partly) related to the way the fm input tends to clip/distort (it seems like it does, am I wrong) ? |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sun Sep 28, 2008 4:44 am Post subject:
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| usw wrote: | | are the improvements you mention (partly) related to the way the fm input tends to clip/distort (it seems like it does, am I wrong) ? |
Yes, thanks for pointing that out. It looks like I was overdriving something there -- probably pushing past the end of the frequency range. There are some levels that need to be looked at more closely.
Ian |
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bridechamber
Joined: Oct 06, 2007
Posts: 64
Location: Saint Paul, MN
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| Posted: Sun Sep 28, 2008 6:03 am Post subject:
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| neandrewthal wrote: |
Scott |
That's not enough for everyone [/quote]
: )
10 for me, 10 for you? |
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neandrewthal
Joined: May 11, 2007
Posts: 672
Location: Canada
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| Posted: Sun Sep 28, 2008 4:38 pm Post subject:
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| bridechamber wrote: | | neandrewthal wrote: |
Scott |
That's not enough for everyone |
: )
10 for me, 10 for you?[/quote]
Sure, why not
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dar303
Joined: Jul 15, 2007
Posts: 97
Location: Sweden
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| Posted: Mon Sep 29, 2008 2:07 pm Post subject:
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We are looking forward to more data and information!
Your projects are great, I learn a lot from your posts even if I don't always build the circuits! |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Tue Sep 30, 2008 7:38 pm Post subject:
2 demos |
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This project is moving along bit by bit. I was stuck for a while getting the bipolar discharge switch comparators working right, but finally it seems OK. Still lots of work to do, but for now here are a couple of demos.
The first has sawtooth carrier and triangle fm modulation, in unison. Three sections: (1) no modulation, (2) modulation just slightly into the negative frequency regime and (3) deep TZ modulation.
The second has a 3/2 frequency ratio. Modulation is either by triangle or square wave. Various depths of dynamic modulation in several patterns.
Thanks for all the interest! This is beginning to look like it might fly.
Ian
| Description: |
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unisondemo01.mp3 |
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| Description: |
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threetwodemo03.mp3 |
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urbanscallywag
Joined: Nov 30, 2007
Posts: 317
Location: sometimes
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| Posted: Tue Sep 30, 2008 7:57 pm Post subject:
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Wow the second demo is great!  |
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guitarfool
Joined: Feb 26, 2007
Posts: 161
Location: Maryland
Audio files: 8
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| Posted: Tue Sep 30, 2008 8:27 pm Post subject:
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| Wonderful! My soldering iron is quivering in anticipation |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Thu Oct 02, 2008 7:43 am Post subject:
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This just keeps getting better and better. I was afraid it would be hard to get good tracking with the control current passing through an OTA. It took almost a whole day, but I got it working right yesterday. It runs up to over 100 kHz and tracks to within 0.2% up to 20 kHz. Better than a lot of standard VCOs out there. Wheee ...
Ian |
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loss1234
Joined: Jul 24, 2007
Posts: 1536
Location: nyc
Audio files: 41
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usw
Joined: Mar 22, 2007
Posts: 27
Location: valence france
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| Posted: Thu Oct 02, 2008 10:45 am Post subject:
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| I'd really like to understand how this works ? |
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johans121
Joined: Jun 19, 2007
Posts: 178
Location: Huntsville, AL (USA)
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| Posted: Thu Oct 02, 2008 7:52 pm Post subject:
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| Yummy!!!!!! |
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phdinfunk
Joined: Jun 04, 2008
Posts: 119
Location: Taiwan
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Posted: Thu Oct 02, 2008 9:03 pm Post subject:
In
Subject description: Like Flynn |
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Okay, I'll buy. You and your oscs said all you freakin' need to say to get my vote. How soon do you think we can expect a PCB/project? (I'm not trying to rush you, I just want to know what to expect--I have no idea how to guess and I'm curious [
I'll probably take 8 depeding on PCB cost and BOM
Peace,
JP |
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