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Doepfer A-149-1 Quantized Stored Random CV

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The Doepfer A149-1 is a Modular Synthesizer featuring Quantized and Stored random control voltages. The Doepfer Modu...  Alle vareoplysninger

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DOEPFER A-149-1

The Doepfer A149-1 is a Modular Synthesizer featuring Quantized and Stored random control voltages. The Doepfer Module A-149-1 has available four different analog random control voltages that are generated in different ways. The "Quantized Random Voltages" section has available 2 CV outputs: "N+1 states" and "2N states". N is an integer number in the range 1...6 that can be adjusted with the manual control (Man N) and an external control voltage CVN with attenuator. Whenever the rising edge of the input clock signal (Clk In) appears a new random voltage is generated at the N+1 resp. 2N output. The N+1 output is capable to generate N+1 different voltage levels (or states), the 2N output up to 2N different states. If for example N is set to 4 the N+1 output generates up to 5, the 2N output 16 different states. The voltage steps of the  2N output are adjusted to 1/12 V in the factory. Consequently exact semitones can be obtained in combination with a VCO. The voltage steps of the n+1 output are adjusted to 1.0 V in the factory corresponding to octave intervals in combination with a VCO. For each output a trimming potentiometer is available on the pc board that enables the user to select other voltage steps for the output in question.

Even the "Stored Random Voltages" section has 2 stepped CV outputs available: one with even voltage distribution of the max. 256 output states and second one with adjustable voltage distribution probability. The distribution probability is adjusted by a manual control (Man D) and an external control voltage CVD with attenuator. With the control set fully counterclockwise most of the random voltages will be low magnitude but even medium and high magnitude voltages may appear but with smaller probability. As the control is turned to the right (or a positive control voltage appears at the CVD input) the distribution moves through medium to high magnitude voltage probability. The symbol at the lower jack socket shows this coherence graphically. The voltage range is 0...+5V for both outputs of the "Stored Random Voltages" section. For each output a trimming potentiometer is available on the pc board that enables the user to select another voltage range for the output in question.

The main features of the Doepfer A149-1 include:

  • All random voltages are derived from digital pseudo random generators that work with shift registers and digital feedback via exor gates
  • The digital output voltages of the shift registers are added up with resistors to obtain variable stepped analog voltages
  • The A-149-1 can be extended by 8 random digital voltages with the A-149-2 Digital Random Voltages module
  • For the N+1 output all resistors have the same value, the 2N output uses resistors in ratios of 1:2:4:8:16:32
  • Consequently the N+1 output has less different states available than the 2N output
  • The digital shift register outputs are gated dependent on the current N voltage (sum of manual control + external CV) by which the number of possible states can be reduced
  • The shift registers are clocked by the external clock input Clk In
  • The generation of the "Stored Random Voltages" is similar but with different resistor values and more shift register outputs
  • The random voltage is processed by a non-linear clipping unit with adjustable offset that allows to modify the distribution probability of the voltage levels appearing at the lower output
  • Even though the module is intended to generate slowly varying control voltages clock frequencies up to moderate audio range (about 2 kHz) can be processed
  • Width: 60.6mm
  • Depth: 60mm (Measured from the rear side of the front panel)
  • Current: 40mA

Funktioner:

  • Producent: Doepfer
  • TE/HP: 12
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+49 (0)221 / 88 84 - 1610
+49 (0)221 / 88 84 - 2500
export@musicstore.de