User Manual

Please refer to the image below:

Installation

Power

House the FHX-8CV in a Eurorack case of your choosing. The power connector is Doepfer standard. If using the power cable supplied with the FHX-8CV, the connector is keyed and will only insert into the FHX-8CV the correct way round, in which case the red edge of the cable is nearest the edge of the PCB, and carries -12V. ("-12V" is marked on the PCB itself next to this end of the connector.) Be sure to connect the other end of the power cable correctly, again so -12V corresponds to the red stripe on the cable.

Connection to FH-2

The FHX-8CV also needs to be connected to an FH-2 module via its "Expansion IN" connector. A 10-way cable is supplied with the FHX-8CV. Orient this cable with the red stripe down at both ends.

Note: while the 10-way connector on the FHX-8CV may look like the power connector on some Doepfer modules, it is not wired the same. If you connect this to a Doepfer power bus, you will almost certainly fuse the power supply and fry the FHX-8CV. This connector is only to be used for connecting the FHX-8CV to an FH-2.

Multiple expanders

When multiple FHX-8CVs are to be driven from a single FH-2, they are daisy-chained. The first connection is from the FH-2 to the first FHX-8CV's Expansion IN connector. The second connection is from the first FHX-8CV's Expansion OUT connector to the second FHX-8CV's Expansion IN connector. Further FHX-8CVs are connected in the same manner. All the expansion cables are oriented the same way - if you find yourself twisting the cables, chances are you're inserting the ends incorrectly. With a row of FH-2/FHX-8CVs, all the cables should stay flat.

The above also applies when combining the FH-2 and FHX-8CVs with the FHX-8GT expander. The expansion modules are daisy-chained from the OUT header on one to the IN header on the next.

Note that each FHX-8CV requires its own individual power connector as well as the expansion connector.

Jumpers

Expander selection jumpers

The header on the PCB marked "GT3 Select" is used to set which expander number the FHX-8CV responds to. Up to seven FHX-8CVs can be connected to an FH-2, so there are seven possible combinations of jumpers.

The expansion channel is selected by placing jumper links in a binary pattern on positions 1, 2 & 3 of the header. As shipped, a jumper is on position 3, for expander number 1.

Voltage range jumpers

When used with an FH-2, the output voltage range of each output can be set individually in the FH-2's configuration. However, when used with an FH-1 this is not possible, and the output voltage range can be set for the outputs in groups of 4 via jumpers on positions 4 & 5 of the "Select" header.

Jumper 4 sets the voltage range of outputs 1-4. With no jumper, the range is 0-10V. With a jumper fitted on this position, the range of the outputs is ±5V.

Jumper 5 sets the voltage range of outputs 5-8 in the same way.

To reiterate, this does not apply when the FHX-8CV is used with an FH-2.