Ian Fritz Teezer Through-Zero VCO


MOTM

$380                Assembled Module    FOUR in stock


$250                Full Kit


$38                  Panel


$40                  PCB


$100                Component Kit


$50                   Rare Parts Kit -- 2227, 2 134, 2 2134, 3280, 2220,

                                        2 matched zeners



Documentation emailed with purchase.


See Richard Brewster’s module page here.

See David Brown’s module page with notes

on 15V modifications here.

These notes are summarized at the bottom of this page, oh builders.

Dragonfly Alley Project Page.

Sound samples from Ian:


One: Percussive sounds using Teezer Tri output with chaotic variation in frequencies.



Two: Dynamic depth synchronization of Teezer.



Three:  3/2 carrier to modulation frequency ratio. Teezer Saw carrier moduled  by Tri or Squ wave. Various modulation depths.



Four:  Bells and other percussive sounds with Teezer Sin carrier and deep modulation.



Five:  Teezer modulated by a VCO with a VC Saw-Tri shaper followed by a Threeler filter.  An ADSR drives the shaper and the filter.



Six: A DoubleDekka VCO dynamically modulating a Teezer with Sin out. Various levels of modulation depth and sync.



Seven:  Teezer Saw carrier and Tri FM modulation, in unison, various FM depths.



Eight:  Demonstration of Teezer sync locking over three octaves with modulation up to 1000%.



Nine:  Teezer at low Bias setting. Lin FM from fixed Tri wave.  Exp FM from Jerkster chaos generator.  VCA and Theeler VCF also controlled from Jerkster.



Ten:  A DoubleDekka VCO dynamically modulating a Teezer with Sin out. Various levels of modulation depth and cross coupling.



Eleven:  Demonstration of 1000% modulation of Teezer without then with sync.  Note minimal pitch shift without sync and minimal timber change with sync.






Notes for 15V building without using different zeners (thanks Dave at www.modularsynthesis.com!)


R28         27k

R116       487k

R119       30k

D203-4    8v2

D205-6    6v2


These are now sent in the kits.

Also, an extra 33p cap is sent for C6. If you have trouble getting symmetry at the triangle top, try using the 33p.