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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 [[CEM3320]] [[IC]] used in the module is no longer available.<ref name="a121" />
== Specifications ==
* Width: 12TE/12HP/60.6 mm
* Depth: 55
* Current draw: 30mA
== References ==
{{reflist}}
== External links ==
[http://www.doepfer.de/a121.htm A-121 Multimode Filter (VCF2)] at Doepfer Musikelektronik
[[Category:Doepfer]]
[[Category:Modular synthesizers]]
[[Category:Analog synthesizers]]
[[Category:VCF]]
[[Category:CEM IC synthesizers]]
[[Category:Eurorack modules]]
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