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 Forum index » DIY Hardware and Software
Triangle to Saw waveshaper - anybody? hello?
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bubblechamber



Joined: Nov 04, 2006
Posts: 276
Location: NYC
Audio files: 1

PostPosted: Thu Mar 13, 2008 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

that went faster than I expected. this is sort of a complicated design. it took me a couple of hours to get it working properly, but it's worth it. I've disconnected the Pulse out, but the PWM works great, on the SAW out. it modulates the 2 halves of the SAW wave separately. A pulse driving this instead of a SQUARE wave produces an asymmetric SAW, the join point is somewhere other than at 0v. And anything other than a perfectly symmetrical TRIANGLE causes a convex or concave ramp. A SINE really messes things up and for maximum chaos use waves from different, non sync'ed VCOs to drive it. When the TRI and SQR are out of phase + PWM all sorts of cool stuff starts happening. good luck. feel free to PM me if you run into problems


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sneakthief



Joined: Jul 24, 2006
Posts: 529
Location: Berlin

PostPosted: Thu Mar 13, 2008 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

if you don't mind me asking, what FET did you use?
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bubblechamber



Joined: Nov 04, 2006
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Location: NYC
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PostPosted: Thu Mar 13, 2008 2:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

MPF-102
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sneakthief



Joined: Jul 24, 2006
Posts: 529
Location: Berlin

PostPosted: Thu Mar 13, 2008 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

thank-you sir bubble!
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bubblechamber



Joined: Nov 04, 2006
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Location: NYC
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PostPosted: Thu Mar 13, 2008 5:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

no problem. this is a really cool waveshaper. I've been having a lot of fun with it today.
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Tim Servo



Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
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PostPosted: Fri Mar 14, 2008 2:32 pm    Post subject: Triangle to Saw waveshaper - anybody? hello? Reply with quote  Mark this post and the followings unread

I'll have to try fiddling with this a little more. A very similar waveshaper is used on the Thomas Henry LM VCO, and on the Magic Smoke 566 VCO (also a TH design). Messing with the pulse width or driving it with different waves is something I've wondered about but never tried. Thanks for the inspiration!

Tim (fiddling with a fiddle) Servo
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