EM-105 | Variable Waveshape Oscillator

BAUHAUS is a precision analog oscillator built around a thermally compensated, discrete sawtooth integrator core with matched transistor arrays. It provides calibrated 1 volt per octave tracking across eight octaves, with three selectable frequency ranges extending from sub-audio modulation to 20 kHz.

Two independent analog waveshaping circuits provide extensive control over waveform geometry and harmonic structure. The rectangular waveshaper offers continuously variable pulse width, progressing between leading- and trailing-edge pulse configurations through a symmetrical square wave. A separate, discrete analog waveshaping architecture generates continuously variable falling sawtooth, triangle, and rising sawtooth waveforms. Both sections feature dedicated manual controls and independent voltage-control inputs, allowing simultaneous modulation of pulse width and waveform symmetry.

A dedicated piecewise-linear sine converter progressively transforms the triangle waveform into a low-distortion sinusoid through a precision diode shaping network. Successive conduction thresholds approximate sinusoidal curvature while maintaining an entirely analog signal path. All three waveform outputs are available simultaneously.

Two distinct synchronization architectures offer fundamentally different responses to external signals. A dedicated high-impedance JFET proximity circuit provides progressive phase locking and complex subharmonic relationships without conventional hard resetting. In contrast, hard cycle synchronization interacts directly with the oscillator's active comparator feedback loop, producing complex, phase- and slope-dependent harmonic transitions and sharply articulated timbres.

01 / OSCILLATOR ARCHITECTURE

Thermally compensated discrete sawtooth integrator core
Matched transistor arrays for temperature stability
Eight-octave calibrated 1V/octave tracking
Three selectable frequency ranges
Precision multi-turn frequency control with mechanical lock

02 / WAVEFORM GENERATION

Independent rectangular and sawtooth/triangle waveshaping sections
Continuously variable pulse width with leading- and trailing-edge symmetry
Discrete transistor waveshaping
Continuous falling sawtooth / triangle / rising sawtooth symmetry
Dedicated CV inputs for pulse width and sawtooth/triangle symmetry
Piecewise-linear sine conversion via multi-segment diode network
Three simultaneous waveform outputs

03 / SYNCHRONIZATION

JFET proximity synchronization with phase locking and subharmonic generation
Hard cycle synchronization via active comparator feedback

POWER & CONNECTIVITY

±12 V. 10-Pin IDC / Keyed Headers. Red Stripe: −12 V.

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