Not long after the David Dixon finished the Dixie design he began working on a totally novel approach to implementing tzfm (thru zero frequency modulation). After almost a year of experimenting and many pcb revisions later we are pleased to present what is surely David’s masterpiece as far as analog vco design is concerned.
\nthe Rubicon is packed with the following features:
\nSwitchable linear and (for the first time in any module) exponential tzfm
\nLinear index vca for dynamic control of tzfm depth
\nSymmetry control (full cw is normal, full ccw gives reversed waveforms, centered the vco is at 0 hz) with vc input
\n12 primary waveform types: sine, sigmoid, double sigmoid, triangle, saw, double saw, zigzag, square, pulse (center modulated), pulse (edge modulated), double pulse
\nSuboctave circuit (similar to the one found on the roland sh-101) with -1 and -2 octaves. (suboctave output is affected by fm just like the main signals.)
\nSoft sync (aka reversing sync) with attenuator
\nHard sync with selectable reset direction (determines if the triangle starts moving up or down after a reset, very useful in lfo mode)
\npwm and exp fm with dedicated attenuators.
\nwide frequency range:
\nhi range (vco): 1 hz to 24 khz
\nlo range (lfo): 0.01 hz (100 seconds) to 240 hz
\nprecise tracking within 0.1% over 8 octaves
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