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 Forum index » DIY Hardware and Software
TZFM SAW VCO
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frijitz



Joined: May 04, 2007
Posts: 1709
Location: NM USA
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PostPosted: Fri Sep 26, 2008 5:24 pm    Post subject:  TZFM SAW VCO Reply with quote  Mark this post and the followings unread

This looks somewhat promising. It's a SAW VCO with thru-zero FM. So far just a proof of principle. But quite simple and cost effective. None of that doo-dah with rectifying the CV, separately reversing the core direction, etc. Just modulate the core's input current back and forth and carefully process what comes out...

Very Happy

Ian


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guitarfool



Joined: Feb 26, 2007
Posts: 156
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PostPosted: Fri Sep 26, 2008 5:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

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 Very Happy
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jnuaury



Joined: Feb 28, 2008
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Location: chicago
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PostPosted: Fri Sep 26, 2008 6:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Fri Sep 26, 2008 7:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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Scott Stites
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PostPosted: Fri Sep 26, 2008 7:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

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: 1214
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PostPosted: Sat Sep 27, 2008 1:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Interesting, I look forward to seeing more !
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EdisonRex
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Joined: Mar 07, 2007
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PostPosted: Sat Sep 27, 2008 2:40 am    Post subject: Reply with quote  Mark this post and the followings unread

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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usw



Joined: Mar 22, 2007
Posts: 27
Location: valence france

PostPosted: Sat Sep 27, 2008 3:43 am    Post subject: Reply with quote  Mark this post and the followings unread

what's the modulator's waveform in the scope sample ?
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frijitz



Joined: May 04, 2007
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PostPosted: Sat Sep 27, 2008 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

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.)

Very Happy

Ian
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bridechamber



Joined: Oct 06, 2007
Posts: 64
Location: Saint Paul, MN

PostPosted: Sat Sep 27, 2008 12:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Drooool............
: )

I'll take ten!

Scott
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Sat Sep 27, 2008 1:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

bridechamber wrote:
Drooool............
: )

I'll take ten!

Scott

That's not enough for everyone Surprised Wink

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Junk Rhythm



Joined: Jan 07, 2008
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Location: San Francisco, CA

PostPosted: Sat Sep 27, 2008 8:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Peake wrote:

And mp3s please!

Shocked Shocked Shocked Oh yes please.
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usw



Joined: Mar 22, 2007
Posts: 27
Location: valence france

PostPosted: Sat Sep 27, 2008 11:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Sun Sep 28, 2008 4:44 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

Very Happy

Ian
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bridechamber



Joined: Oct 06, 2007
Posts: 64
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PostPosted: Sun Sep 28, 2008 6:03 am    Post subject: Reply with quote  Mark this post and the followings unread

neandrewthal wrote:


Scott

That's not enough for everyone Surprised Wink[/quote]

: )

10 for me, 10 for you?
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Sun Sep 28, 2008 4:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

bridechamber wrote:
neandrewthal wrote:


Scott

That's not enough for everyone Surprised Wink


: )

10 for me, 10 for you?[/quote]

Sure, why not Very Happy

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dar303



Joined: Jul 15, 2007
Posts: 97
Location: Sweden

PostPosted: Mon Sep 29, 2008 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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Location: NM USA
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PostPosted: Tue Sep 30, 2008 7:38 pm    Post subject: 2 demos Reply with quote  Mark this post and the followings unread

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.

Very Happy

Ian


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urbanscallywag



Joined: Nov 30, 2007
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PostPosted: Tue Sep 30, 2008 7:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow the second demo is great! Cool
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guitarfool



Joined: Feb 26, 2007
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PostPosted: Tue Sep 30, 2008 8:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wonderful! My soldering iron is quivering in anticipation Very Happy
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frijitz



Joined: May 04, 2007
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Location: NM USA
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PostPosted: Thu Oct 02, 2008 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

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 ...

Very Happy

Ian
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loss1234



Joined: Jul 24, 2007
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Location: nyc
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PostPosted: Thu Oct 02, 2008 10:26 am    Post subject: Reply with quote  Mark this post and the followings unread

I CANT WAIT Till you make a pcb for this!!!


Also..i love that second sample! you are really rocking out Ian!

it feels like a good time to be making synths Smile

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usw



Joined: Mar 22, 2007
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PostPosted: Thu Oct 02, 2008 10:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy I'd really like to understand how this works ?
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johans121



Joined: Jun 19, 2007
Posts: 174
Location: Memphis, TN (USA)

PostPosted: Thu Oct 02, 2008 7:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yummy!!!!!!
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phdinfunk



Joined: Jun 04, 2008
Posts: 115
Location: Taiwan

PostPosted: 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 [Smile

I'll probably take 8 depeding on PCB cost and BOM

Peace,

JP
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