Item number: 10022804
Doepfer

Doepfer A-110-4

Quadrature VCO
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129.00
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A-110-4 is a so-called Thru Zero Quadrature VCO. In this context, quadrature means that the oscillator outputs a sine and a cosine waveform simultaneously.

The term Thru-Zero means that negative frequencies can also be generated. However, this statement is somewhat misleading, as negative frequencies do not really exist. In this context, negative simply means that the sine/cosine waves stand still and stop oscillating when the linear control voltage reaches 0V and continue oscillating in the opposite direction when the linear control voltage becomes negative.

The module is divided into the sections: linear and exponential. The exponential section consists of the XTune control, the 1Volt/octave input and the XFM input with the associated attenuator. The sum of these three voltages is the exponential control voltage. The linear section consists of the LFreq controller and the LFM input with the associated attenuator. The linear control voltage is the sum of these two voltages. A two-colour LED indicates the polarity of the linear control voltage (red=positive, yellow=negative). The pitch of the oscillator at the sine/cosine outputs is determined by the control voltages of both sections.

The advantage of the A-110-4 over other Thru Zero oscillators is that its tone generation is sine/cosine based. These waveforms are not derived from other waveforms such as triangle or serrated. Therefore, it produces very clean waveforms with minimal distortion and overtones. With its two control modes, linear and exponential, as well as its Thru-Zero frequency modulation capability, the VCO can be used for a wide variety of FM applications.
  • Width: 8 TE
  • Depth: 60 mm
  • Current consumption: +90 mA +12V, -30 mA -12V
Technical data

Construction

Analog VCO

Type

Sound Generators

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Doepfer A-110-4

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