The DuoVibe is a two-stage optical vibe circuit than can also cop subtle phaser tones. The LFO is modified from the Shoot the Moon tremolo (itself derivative of the Tremulus Lune) and is capable of triangle wave and near-square wave output. The pitch bend in Vibe mode is discernible but not capable of “seasick” wobble. With the depth cranked, you can think of it as a sort of “tremolo with funk going on” kind of thing. There is a Vibe/Phase Mode switch, the name of which indicates its function and purpose. This switch simply toggles a feedback filtering cap value, but is useful despite the simplicity.
Sweet! Gonna give this one a go...
ReplyDeleteJust a quick note: The circuit tends to cut highs a bit, especially with dirt in front. So by adding a small emitter-bypass cap to Q1 (parallel with the emitter resistor of Q1), the gain is boosted for higher frequencies and cancels out the roll-off. I would suggest trying 10n for the cap, and then adjust by ear until you get the sound you want.
ReplyDeleteIn case of wanting to give more depth to the effect that value would have to alter? Thank you very much in advance.
DeleteThanks for that info!
ReplyDeleteJust finished this circuit, it's verified as working :)
ReplyDeleteDid you add the extra cap to boost the highs?
DeleteNo, I didn't add it. I would be using it on bass if I end up boxing it, so I figured I would leave it alone.
DeleteHello, My name is Martin, i´m from Argentina. I have done a lot of your projects, your page is fantastic. Thank you very much, my friend. I may ask you if you can try another vibrato effect: The dephs from Earthquaker devices
ReplyDeletehttp://tagboardeffects.blogspot.com.ar/2016/11/earthquaker-devices-dephs.html
Thanks Martin! I've got the schematic and I'm working on it already. Should be out in the next couple weeks sometime.
DeleteHow can i up the volume on this project?.. verified and working but its a bit low versus the unity gain. Thanks
ReplyDeleteYes
ReplyDelete