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Doepfer A138d CFX Eurorack Module, FX Insert, Crossfade. Excellent condition due to light use with just a little rack rash around the screw holes – see pic. This module is ideal for connection of external effects with 6.35mm jacks – I have another two of these in my system – this is being sold to make space for other modules. Dispatched with Royal Mail 2nd Class signed for.
Product info:
Module A-138d can be used in two different ways: as a crossfader module within the A-100 as an insert module for external effect units (e.g. guitar stomp boxes) with dry/wet control If the module is used as a crossfader within theA-100 the two audio signals are connected to the sockets In 1 and In 2.The position of the CF (Crossfade) controldefines the relation between the levels of the signals In 1 and In 2that appear at the Mix Output. In the leftmost position of CF only In1 appears at the output, in the rightmost position only In 2. In thecenter position both inputs appear with the same level at the Mix Output.Each input is equipped with two sockets (miniature multiples) so that the inputsignals can be forwarded to other modules too. Even the Mix Output hastwo sockets available. The mute switch can be used to mute In 1 or In 2 independent of theposition of the crossfade control. In the center position it has nofunction. The controls Atten. and Amp. and the 1/4″sockets FX Send and FX Return are not used in thisapplication. If the module is used as an effect send/returnmodule with dry/wet control the A-100 signal that has to be processed by theexternal effect unit is connected to In 1. The signal can be attenuatedby control Atten. before it is output to the 1/4″ socket FX Send.The attenuator has been added because some effect units without input levelcontrol (especially guitar stomp boxes) will distort with A-100 levels (~ 1 Vssor more). The attenuator can be used to reduce the signal level so that nodistortion occurs. Atten. is adjusted so that the external effect unit does notdistort. The output of the external effect unit is connected to the 1/4″socket FX Return. This socket is followed by anamplifier and the control Amp. is used to amplify the signal to obtainagain A-100 audio level (~ 1Vss or more). Amp isadjusted so that the loudness of both signals (i.e. original = dry = In 1 andthe effect return signal = wet = In 2) have nearly the same loudness. Theamplification range of the FX return amplifier is 1 to 50 (or 0 to 33dB). Theoutput of the amplifier is normalled to the upper socket of Input 2. Inthis application no plug is inserted into the upper In 2 socket. Thelower In 2 socket can be used to obtain the effect return signal beforeit is processed by the crossfade unit of the A-138d. The CF control ofthe A-138d works now as a dry/wet control for the external effect. In theleftmost position of CF only the original signal (i.e. not processed)appears at the Mix Output, in the rightmost position only the effectsignal. In the center position the original and the processed signal appear withthe same level at the Mix Output. The mute switch can be used to mute theoriginal or the effect signal independent of theposition of the crossfade control. In the center position it has nofunction. Attention:If the small sockets In 2 are used (i.e. no FX return via the 1/2″ socket)the signal has to be fed into the upper socket In 2. Then thelower socket In 2 can be used to forward the signal to another module! The uppersocket In 2 is normalled to the output signal of the internal amplifier thatamplifies the FX return signal. If a plug is inserted into the upper In 2 socketthis internal signal is interrupted (switching contact). That’s valid even if noFX return signal is connected as in this case the output of the amplifier is ~0V/GND. If a plug is inserted into the lower In 2 socket only a short circuitbetween this signal and the output of the internal amplifier is made ! Nothingcan be damaged within the A-100 but the results will be strange. Pleaserefer to the sketch below for internal wiring details. Typical applications: Crossfader for two different A-100 signals Crossfade between original and processed audio signal (dry/wet control). For this the incoming audio signal is patched to input 1 of the A-138d and passed on to the audio input of the sound processing module in question (e.g. filter, phaser, flanger,frequency shifter, wave multiplier, wave shaper …). The audio output of the sound processing module is patched to input 2 of the A-138d. Involving external effect units into A-100 dry/wet control for the external effect
Width: 8 TE / 8 HP / 40.3 mm
Depth: 40 mm (measured from the rear side of the front panel)
Current: +20mA (+12V) / -20mA (-12V)
More info: http://www.doepfer.de/home_e.htm
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Category: Musical Instruments:Pro Audio Equipment:Synthesisers and Sound Modules
Location: Kettering