Format: Eurorack
Width: 6HP
Depth: --mm
Current: 25mA @ + 12V, 30mA @ -12V
Xaoc Devices Erfurt is a programmable digital oscillator that functions as a bidirectional digital counter and eight-output clock/audio frequency divider, and is part of the company's Leibniz binary system.
The Erfurt's 8-bit register holds the current state of an 8-bit numerical value representing a digital value from 0 to 255. This state is provided via eight binary outputs (5V gates) on the front panel and reflected in eight LEDs that indicate the state. The module has three clock inputs: one that increments the state with each impulse ( INCR ), one that decrements it ( DECR ), and the remaining one that resets the state to zero ( RESET ). The state can also be changed manually using two buttons on the panel.
When the module is used alone, the state of Erfurt changes by 1 on every impulse from the clock input, counting from 1 to 0 in one cycle.(modulo 256). This allows the frequency of the signal to be divided into 2, 4, 8,.. up to a maximum of 128, available from the individual bit outputs, and depending on the clock input used, rhythms with mathematical or musical division numbers can be created. Different clock patterns will be generated.
By patching two different clock signals to its inputs, the counter alternately increments and decrements its states, eventually counting at a rate proportional to the frequency difference between the two clocks. A third clock patched to the Reset input can shorten sequences and incomplete cycles for even more rhythmic versatility.
If a Leibniz data source is connected to the back of the module, the state will increase or decrease at larger intervals depending on the data present on the Leibniz bus (e.g. the value programmed on the Lipsk button). This causes the counter to overflow faster and generates more complex patterns.
The counter state can be used as a phase input to a digital wavetable. When used in conjunction with other Leibniz modules, Erfurt can perform a variety of roles, such as scanning waveforms with Jena , generating stepped voltages useful for creating interesting glissandos with Drezno or any VCO , generating gate patterns to animate the spectrum of Odessa 's harmonic bank, or generating pseudo-chaos sequences with feedback to Lipsk . Because Erfurt is based on CMOS logic rather than a CPU, it can clock at very high frequencies beyond audio rates. Therefore, a select switch is provided to scale the clock.
