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Analogue  Modular  System  A-100

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Owners Manual

Quad 3-Way Crossfader / Mixer / Polarizer

The A-138e contains four identical units that can be used for different crossfading, mixing and polarizing applications.


Applications:-

Attenuation of audio and control voltage signals

Polarizing of audio and control voltage signals

Two-way crossfading of audio and control voltage signals

Three-way crossfading of audio and control voltage signals

Two-way crossfading and polarizing of audio and control voltage signals

Changing filter characteristics (e.g. lowpass to highpass)




A-138e

16

30

10HP

10

10HP

A-138e  

Doepfer A-138e

Polarizer: only input A is used, inputs B and C are not used. In this case the sub-unit works as a polarizer. In the ccw position of the control the signal connected to input A appears at the output, in the cw position the inverted, in the centre position no signal appears at the output
Two-way Crossfader type 1: Two different signals are connected to the inputs A and C, switch is in the left position (switching contact of input B is open). In this case the sub-unit works as two-way crossfader between the two signals connected to the inputs A and C. In the centre position both signals appear with the same level. Two-way attenuator: Two different signals are connected to the inputs A and C, switch is in the right position (switching contact of input B is connected to GND). In this case control is used to attenuate signal A (between ccw and centre position) or signal B (between centre and cw position). In the centre position no signal appears at the output. Similar to the two-way crossfader but without signal in the centre position.
Three-way Crossfader: Three different signals are connected to the inputs A, B and C. In this case the sub-unit works as three-way crossfader. In the ccw position only signal A appears at the output. Between ccw and centre position a mix of the signals A and B appears at the output. In the centre position only signal B appears at the output. Between centre and cw position a mix of signals B and C appears at the output. In the cw position only signal C appears at the output.
Two-way Crossfader/Polarizer type 2: Two different signals are connected to the inputs A and B. In the ccw position only signal A appears at the output. Between ccw and centre position a mix of the signals A and B appears at the output. In the centre position only signal B appears at the output. Between centre and cw position a mix of signals B and inverted signal A appears at the output. In the cw position only the inverted signal A appears at the output. Useful for CV mixing: e.g. signal A = ADSR, signal B = LFO. In this case one can fade between ADSR ... LFO + ADSR ... LFO ... LFO - ADSR ... - ADSR.
In addition the inverted signal of input A is available as a separate output. For the control a potentiometer with centre detent is used. Sub-unit 4 can be used optionally as a summing unit for the devices 1-3. For that an internal jumper is available that connects the outputs 1-3 to unit 4. Alternatively an A-138a/b mounted next to the A-138e can be used as summing unit for all four sub-units (2 wires have to be soldered to the A-138a/b). Applications: Attenuation of audio and control voltage signals Polarizing of audio and control voltage signals Two-way crossfading of audio and control voltage signals Three-way crossfading of audio and control voltage signals Two-way crossfading and polarizing of audio and control voltage signals Changing filter characteristics (e.g. lowpass to highpass)