Modules

This page lists the modules currently available for purchase from Exclusively Analogue. This page will continue to grow as more modules are made available.

Universal Active Filter (UAF) | VCO Range Switches Module | Potpourri Module | Voltage Controlled Low Pass Filter | Multimode Filter

Exclusively Analogue Universal Active Filter
The Exclusively Analogue Universal Active Filter is a fully voltage controlled filter with simultaneous
highpass, bandpass, lowpass, and notch outputs and is based on the Eµ 2120 UAF module. It contains an 1120 UAF submodule.Each of the three signal inputs passes through an attenuator, then the signals are summed and pass through the filter to appear at each of the outputs. The highpass signal is filtered 12 dB/octave below the cutoff frequency, the bandpass 6 dB/octave on both sides of cutoff, and the lowpass 12 dB/octave above cutoff. The notch output is unfiltered except for a 40 dB notch near the cutoff frequency. The Notch Frequency control will vary the ratio of the notch centre frequency to the cutoff frequency several semitones to either side.The cutoff frequency is exponentially voltage controlled by the cutoff frequency inputs. The keyboard switch connects either of two keyboards at precisely lV/octave. The Q of this filter is exponentially voltage controlled over a range from 1/2 to 512, at one volt per factor of two change. The Q is numerically equal to the gain of the filter at the cutoff frequency. As Q is increased, the filter becomes extremely resonant at Fc. Up to 54dB of gain can be achieved. The notch output is ineffective at high Q. With such high gains, it is very easy to cause the filter to distort. At high Q, the signal input attenuators should be set for low levels.With sufficiently high Q, fast signal transients such as pulse and sawtooth waveforms will cause the filter to “ring” at the cutoff frequency. The keyboard percussion switch patches a keyboard’s gate and trigger signals into the filter to use this effect. On depression of a key, the trigger signal causes the filter to ring with a decay set by the Q control. When the key is released, the filter Q control instead becomes active, allowing a damping effect if desired. The final Q control has no effect with the keyboard percussion switch off.

Price: £450
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Exclusively Analogue - Universal Active Filter
VCO Range Switches ModuleThe VCO Range Switches Module enables you to perform instant octave shifts thanks to 3 individual 1V/Octave VCOs. The unit has rotary switches that produce a 1Volt increase at the output each time you rotate the knob clockwise. The 64ft setting is actually 0 volts, 32ft is 1 Volt, 16ft is 2 Volts, etc. The lower knob ‘3’ has an additional ‘LOW’ selection, just like the MiniMoog, that outputs a negative voltage therefore taking the VCO down to LFO territory.

Available in two versions; a complete Emu style unit (with Emu DIL power connection and front panel) or as a unit without the front panel and knobs.

Price: Full Unit (£80)
Basic Unit (£60)

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Exclusively Analogue - Voltage Controlled Low Pass Filter
Potpourri Module is based on the Emu “Potpourri” module. 2 LFOs with attenuated Triangle and Pulse outputs, 2 Analogue Inverters (especially useful for inverting Envelopes), a basic Noise Source, and a Sample and Hold (S&H). The S&H uses the Noise output as the random voltage source and LFO2 as the Clock to take the sample to produce random voltage outputs useful for those ‘classic’ Sample and Hold sounds. It works particularly well modulating a filter that is resonating. The ‘Clock’ jack socket allows an alternate clock source to be used.

We’ve have found that patching the Gate output being used to play the notes into this input gives random voltage outputs that change in time with what’s playing rather than changing ‘out of sync’. Module can also be powered via an alternative power connector just in case you don’t have an Emu modular.

Price: £125
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Exclusively Analogue - Potpourri Module
The EA 2101 Voltage Controlled Lowpass Filter is an exponentially controlled Lowpass filter with variable Q for electronic music applications. It is based on the Emu 2100 Lowpass filter but uses the SSM 2040 IC circuitry rather than the original transistor ladder of the Emu. Since Dave Rossum helped design the SSM ICs this is effectively the LPF module upgrade that would have been built if Emu had continued modular construction. Emu used the SSM2040 circuitry in their later Highpass filter modules and also in their synthesizer voice card. The SSM2040 is best known for its use on the early rev1 and rev2 versions of the Prophet 5.

The top two signal inputs pass through their respective attenuators and are summed with the full level input to form the total signal input. This signal is then Lowpass filtered with a cutoff frequency determined by the sum of the initial cutoff frequency controls and the control inputs. The cutoff slope is 24 dB/octave, and the signal path is DC coupled.
The control inputs are algebraically summed to give a total control input voltage, which will vary the cutoff frequency one octave per volt around the initial cutoff frequency. The keyboard switch allows instant patching of either of two keyboards at precisely one volt per octave. The 1V/octave control input jack is also accurately calibrated.

Although the module is designed to fit straight into an existing Emu modular system it can be a useful addition to any modular to provide a high quality Lowpass filter.

Each module is built to order and has the standard Emu 16 pin DIL connection for power and keyboard inputs. The module requires a +15 volt, -15 volt supply and alternative supply connections can be fitted if required for a small additional charge.

Price: £300
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Exclusively Analogue - Voltage Controlled Low Pass Filter
The EA2120 Voltage Controlled MultiMode filter is an exponentially controlled filter with Bandpass, Lowpass, Notch and Highpass outputs available. The circuitry is based around the Oberheim SEM filter and Emu Resonant filter module. The filter has a 12dB/octave cutoff slope and Resonance (Q) is available on all the modes which enables the filter to create some unique sounds not available on synthesizers with only a Lowpass filter.The top two signal inputs pass through their respective attenuators and are summed with the full level input to form the total signal input. This signal is then filtered with a cutoff frequency determined by the sum of the initial cutoff frequency control and the control inputs. A Mode control allows selection of the various filter types. The cutoff slope is 12 dB/octave, and the signal path is DC coupled.The 2 control inputs, one positive and one inverted (useful in Bandpass and Highpass modes), are algebraically summed to give a total control input voltage, which will vary the cutoff frequency one octave per volt around the initial cutoff frequency. The keyboard switch allows instant patching of either of two keyboards at precisely one volt per octave. The 1V/octave control input jack is also accurately calibrated.Although the module is designed to fit straight into an existing Emu modular system it can be a useful addition to any modular to provide a high quality MultiMode filter.Each module is built to order and has the standard Emu 16 pin DIL connection for power and keyboard inputs. The module requires a +15 volt, -15 volt supply and alternative supply connections can be fitted if required for a small additional charge.

Price: £300
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Exclusively Analogue - Multimode Filter