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tanaelyn
Joined: Apr 29, 2006
Posts: 12
Location: Iowa
Audio files: 2
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 Posted: Sat Apr 29, 2006 2:18 pm Post subject:
Oscillator sync issue |
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Hello All,
I've build a Sound Lab and it works very well. However I have a problem getting the oscillators to sync. I have been over the circuilt board and the panel wiring several times. To debug this problem, I decided to breadboard the oscillators since it would be easier to diagnose. I've attached two mp3 files that demonstrate what osc 2 does when the sync switch is closed and oscillator 1 frequency knob is swept. I have recorded only the output of osc 2 since it is easier to hear the effect. I've substituted several of the capacitors in the circuit but to no avail. If anyone has any ideas or suggestions, it would be greatly appreciated.
| Description: |
| This is the output of oscillator 2 when synced with oscillator 1 and I am sweeping the frequency of osc 1 upwards |
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Download (listen) |
| Filename: |
sync-sweep-up.mp3 |
| Filesize: |
195.03 KB |
| Downloaded: |
737 Time(s) |
| Description: |
| This is the output of oscillator 2 when synced with oscillator 1 and I am sweeping the frequency of osc 1 downwards |
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Download (listen) |
| Filename: |
sync-sweep-down.mp3 |
| Filesize: |
160.91 KB |
| Downloaded: |
741 Time(s) |
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tanaelyn
Joined: Apr 29, 2006
Posts: 12
Location: Iowa
Audio files: 2
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Pehr
Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005
Posts: 4761
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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| Posted: Sat Apr 29, 2006 6:13 pm Post subject:
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It syncs the oscillators by forcing a restart of the waveform. This means that if the slave is running at a higher frequency it will restart the wave before the master gets a chance to. Then the master will prematurely restart it anyway. When the two oscillatorsare close to each other this will seemingly lock them together, but it's not a frequency follower, so as you sweep it they will go out of sync and back into sync as you cover octaves away from the source.
Does that make sense?
BTW I don't know this to be a fact, I just worked it out for myself. If you want a definitive answer on exactly how it works, you should e-mail Ray.
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What makes a space ours, is what we put there, and what we do there. |
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Sat Apr 29, 2006 9:50 pm Post subject:
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| Quote: | | This is the output of oscillator 2 when synced with oscillator 1 and I am sweeping the frequency of osc 1 upwards |
The classic phase sync tone is achieved when oscillator 2 is synced to oscillator 1 and oscillator 2 is swept up in frequency. The frequency remains the same as oscillator 1 but the tone sweeps through harmonics.
Sweeping the frequency of oscillator 2 down (lower than oscillator 1) has no effect on tone or pitch. Sweeping oscillator 1 frequency just changes the pitch unit you get below oscillator 2 frequency when both pitch and tone will change. |
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Pehr
Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005
Posts: 4761
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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| Posted: Sun Apr 30, 2006 1:01 am Post subject:
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g2ian is describing exactly the same thing as I did.
It's not a problem, it's the way it was designed.
How else could you expect it to work?
Maybe I'm missing something about what you're asking!?
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What makes a space ours, is what we put there, and what we do there. |
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Sun Apr 30, 2006 1:11 am Post subject:
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| Uncle Krunkus wrote: | g2ian is describing exactly the same thing as I did.
It's not a problem, it's the way it was designed.
How else could you expect it to work?
Maybe I'm missing something about what you're asking!? |
Yes, sorry Uncle K, I meant to say you were correct.
I was trying to point out that according to the description in the samples, the wrong oscillator was being swept.
If you are looking for the classic phase sync as featured in "Neon lights" by Kraftwerk etc. |
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tanaelyn
Joined: Apr 29, 2006
Posts: 12
Location: Iowa
Audio files: 2
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Sun Apr 30, 2006 3:08 pm Post subject:
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| Ray's sound lab page wrote: |
" S9 causes Oscillator 2 to sync to the frequency of Oscillator 1. This provides some very cool timbres which you will hear if you turn on Sync and then tune Oscillator 1 lower than Oscillator 2 and sweep Oscillator 1 upward in frequency."
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Must be a typo
If Oscillator (2) is synched to oscillator (1) then (2) is the slave, (1) is the master. The cool timbres mentioned only occur when (2)'s frequency is above that of (1). Sweeping (2) up gives a raspy, filter sweepish sort of sound. Sweeping (1) up just changes the pitch of both with (2) getting quieter the higher you go.
That said, I have no idea what is going on in those samples you posted. |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Sun Apr 30, 2006 10:53 pm Post subject:
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hey tanaeylan did you silkscreen you r panel or how did you do it? looks good!
josh |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005
Posts: 4761
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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| Posted: Mon May 01, 2006 3:15 am Post subject:
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Yeah, I agree, you've got a great looking Soundlab! 
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opg
Joined: Mar 29, 2004
Posts: 954
Location: Berkeley, CA, US
Audio files: 3
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| Posted: Tue May 02, 2006 6:13 am Post subject:
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| Ditto! Awesome design! That's what I picture in my head... |
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tanaelyn
Joined: Apr 29, 2006
Posts: 12
Location: Iowa
Audio files: 2
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| Posted: Thu May 04, 2006 2:39 pm Post subject:
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| Actually, the panel is laminated 1/8" polystyrene that has been milled on a CNC engraving machine. I designed the artwork on a vector graphics program and gave it to a friend of mine who runs a sign shop. He scanned in the artwork and etched the panels for me. I have several extras if anyone is interested. |
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Pehr
Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2
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tanaelyn
Joined: Apr 29, 2006
Posts: 12
Location: Iowa
Audio files: 2
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