Doepfer A121: Difference between revisions
mNo edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
The '''A-121''' is a multimode [[voltage controlled filter]] (VCF) with a [[cut-off slope]] of -12 [[Decibel|dB]]/octave. It provides four simultaneous output, each with different characteristics: [[low-pass]], [[band-pass]], [[high-pass]] and [[Notch filter|notch]] (or band reject). The cut-off frequency determines the point at which the respective filter effects appear. The frequency can be adjusted manually, or by voltage control (filter modulation, for instance by an [[LFO]] or [[ADSR]]). Two CV inputs are available, whose [[control voltage]]s are summed. [[Resonance]] (Emphasis or Q ) can be adjusted manually, or by voltage control (VCQ), right up to [[self-oscillation]], in which case it will behave like a [[sine wave]] [[oscillator]].<ref name="a121">[http://www.doepfer.de/a121.htm A-121 Multimode Filter (VCF2)] at Doepfer Musikelektronik</ref> |
The '''A-121''' is a multimode [[voltage controlled filter]] (VCF) with a [[cut-off slope]] of -12 [[Decibel|dB]]/octave. It provides four simultaneous output, each with different characteristics: [[low-pass]], [[band-pass]], [[high-pass]] and [[Notch filter|notch]] (or band reject). The cut-off frequency determines the point at which the respective filter effects appear. The frequency can be adjusted manually, or by voltage control (filter modulation, for instance by an [[LFO]] or [[ADSR]]). Two CV inputs are available, whose [[control voltage]]s are summed. [[Resonance]] (Emphasis or Q ) can be adjusted manually, or by voltage control (VCQ), right up to [[self-oscillation]], in which case it will behave like a [[sine wave]] [[oscillator]].<ref name="a121">[http://www.doepfer.de/a121.htm A-121 Multimode Filter (VCF2)] at Doepfer Musikelektronik</ref> |
||
In 2009 the A-121 was discontinued, replaced by the [[A-106-6]] as the [[ |
In 2009 the A-121 was discontinued, replaced by the [[A-106-6]] as the [[CEM 3320]] [[IC]] used in the module is no longer available.<ref name="a121"/> |
||
==Specifications== |
==Specifications== |
||
Revision as of 22:23, 22 April 2015
The A-121 is a multimode voltage controlled filter (VCF) with a cut-off slope of -12 dB/octave. It provides four simultaneous output, each with different characteristics: low-pass, band-pass, high-pass and notch (or band reject). The cut-off frequency determines the point at which the respective filter effects appear. The frequency can be adjusted manually, or by voltage control (filter modulation, for instance by an LFO or ADSR). Two CV inputs are available, whose control voltages are summed. Resonance (Emphasis or Q ) can be adjusted manually, or by voltage control (VCQ), right up to self-oscillation, in which case it will behave like a sine wave oscillator.[1]
In 2009 the A-121 was discontinued, replaced by the A-106-6 as the CEM 3320 IC used in the module is no longer available.[1]
Specifications
- Width: 12TE/12HP/60.6 mm
- Depth: 55 mm measured from the rear of the front panel
- Current draw: 30mA
References
- ^ a b A-121 Multimode Filter (VCF2) at Doepfer Musikelektronik
External links
A-121 Multimode Filter (VCF2) at Doepfer Musikelektronik