moffenzeef-kriket

Moffenzeef Kriket

Four NAND gate cricket-chirp oscillators with vactrol CV

8 HP Eurorack module

Kriket is a quad CMOS NAND gate square wave oscillator module. Each of the four oscillators can be triggered on and off individually via BANG! inputs, and all four track a shared CV input through a homemade vactrol (photocell + LED) for sloppy, slew-heavy pitch tracking. The result is a gritty, lo-fi chirping texture machine with an organic, imprecise character inspired by hardware hacking tradition.

Features

  • 4 independent CMOS NAND gate square wave oscillators
  • Per-channel BANG! trigger input (active high at 2v or above, rising edge)
  • Per-channel pitch knob with range 185hz to 14khz
  • Shared global pitch CV input (unipolar 0-5v) via homemade vactrol
  • Vactrol built from photocells and single LED for sloppy slew-based CV tracking
  • All four oscillators track same CV simultaneously through shared LED
  • Giant light-isolating enclosure on rear to shield vactrol from exterior light
  • Audio output 4 to 16vpp, 10vpp RMS
  • LED audio output indicator
  • Inspired by Nicolas Collins CD4093 NAND synth circuit from Handmade Electronic Music

Controls & Jacks (13)

  • Channel I Pitch— Pitch control potentiometer for oscillator III (185Hz - 14kHz)
  • Channel II Pitch 2— Pitch control potentiometer for oscillator II (185Hz - 14kHz)
  • LED— Audio output indicator. Driven by incoming CV through Kriket input.
  • Channel IV Pitch— Pitch control potentiometer for oscillator IV (185Hz - 14kHz)
  • Channel III Pitch— Pitch control potentiometer for oscillator I (185Hz - 14kHz)
  • Out— Audio output. 4-16Vpp. 10Vpp RMS.
  • Bang! I— Trigger input for oscillator I. Goes high when 2V or higher is received, rising edge.
  • Bang! II— Trigger input for oscillator II. Goes high when 2V or higher is received, rising edge.
  • Bang! III— Trigger input for oscillator III. Goes high when 2V or higher is received, rising edge.
  • Bang! IV— Trigger input for oscillator IV. Goes high when 2V or higher is received, rising edge.
  • Kriket Input— input jack
  • Channel II Pitch 1— Pitch control potentiometer for oscillator IV (185Hz - 14kHz)
  • ØUT— Audio output. 4-16Vpp. 10Vpp RMS.

How-To Guides

  • Single Channel Cricket Chirp
  • Quad Rhythmic Cricket Texture
  • Vactrol CV Pitch Sweep
  • Generative Random Chirping
  • Envelope-Controlled Chirp Duration
  • Lo-Fi NAND Bass Drone
  • LFO Amplitude Gating Stutter
  • CV-Sequenced Melodic Chirps

Explore the interactive Kriket panel on BleepDex — tap any control to learn what it does.

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