Hampshire Electronics Wave Folder User manual

Hampshire Electronics
Wave Folder in Eurorack Format
Instructions and Details

Table of Contents
Overview.......................................................................................................................................................................3
Installation....................................................................................................................................................................4
Power Availability...................................................................................................................................................4
Connecting the Power .........................................................................................................................................4
Fitment......................................................................................................................................................................4
Using the Wave Folder Module .............................................................................................................................5
Input..........................................................................................................................................................................5
Output ......................................................................................................................................................................5
Depth........................................................................................................................................................................5
Folds..........................................................................................................................................................................6
Folds CV...................................................................................................................................................................7
Trimming the Wave Folder Module......................................................................................................................7
Input Trim ................................................................................................................................................................7
Shape Trim ..............................................................................................................................................................8

Overview
The Hampshire Electronics Wave Folder Module is a 100% analogue wave folder in the
popular Eurorack format.
The wave folder limits the peaks of the input signal but rather than just clipping it actually
inverts the signal and folds it back on itself. This leads to some amazing and interesting
timbres, often generated with no more than a sine input wave.
The folding depth and the number of folded peaks are fully controllable. A CV input is
also provided to control the number of folds with attenuator.
The key details of the Wave Folder are:
8HP Wide Eurorack module with thin profile (20mm deep from faceplate)
Controls designed and laid-out with performance in mind
100% analogue circuitry
Tough yet light composite faceplate
Input range from -5v to +5v
Control over the depth of the fold
Control over the number of folds
CV control (0v to +5v) over the number of folds with attenuator
Trim pots for the input offset and shape symmetry
Diode protected power input
13ma @ +12v
13ma @ -12v

Installation
Power Availability
The Wave Folder module draws the following current from your power supply:
13ma @ +12v
13ma @ -12v
You should first ensure that your power system has enough power capacity to drive the module
before considering installation. If you are in doubt, please consult with your power supply
manufacturer.
Connecting the Power
Refer to the writing on the back of the module next to the 16-pin power connector to ensure that
you connect the power supply correctly. The +12v, -12v and ground (GND) pins will be clearly
marked.
The power inputs are diode protected but damage may occur if the unit is connected incorrectly.
Fitment
Use the screws provided to firmly fit the module into your case. You should make sure that the
module does not move when you insert and remove patch cables.

Using the Wave Folder Module
The wave folder module is controllable for both depth and number of folds.
The wave folder displays its classic sound on sine wave inputs but any other wave or input signal
could also be used. The wave folder is definitely a module to be experimented with!
Input
The in jack socket should be used as the input into the wave folder. Any AC signal can be used in
the range -5v to +5v.
Output
The out jack socket should be used as the output of the wave folder. This will be the folded input
signal.
Depth
The DEPTH knob controls the amount of folding of the input wave.
When the knob is moved counter-clockwise then the folded peaks are fairly small:

When the DEPTH knob is moved clockwise then the folded peaks increase in size, changing the
timbre of the sound:
Folds
The FOLDS knob changes the number of folds. When the knob is moved counter-clockwise then
there is only one fold.
When the FOLDS knob is moved clockwise then the number of folds increases:

Folds CV
The number of folds can be controlled via a CV input. This accepts a standard 0v to 5v control
voltage input. The folds input is used to insert the control voltage.
The FOLDS CV knob attenuates the control voltage so that the CV input effect can be increased
or reduced. In essence the CV performs the same function as the FOLDS knob so it is advised that
the FOLDS knob be turned fully counter-clockwise when using the folds CV input.
Trimming the Wave Folder Module
The trim pots on the Wave Folder module are factory set so should not need adjusting. They can
be adjusted if necessary but it is advised that a good oscilloscope is used to aid this process.
Input Trim
The Wave Folder module has two trim pots. The first trim, simply labelled trim, is in the input trim.
A -5v to +5v sine wave should be inserted into the in jack and the trim pot should be adjusted
until the sine wave passes through cleanly.
Before performing this trimming operation it is important to ensure that the DEPTH and FOLDS
knobs are turned fully counter-clockwise.

Shape Trim
The second trim is for setting the shape of the fold. With the DEPTH and FOLDS knobs set so that
there is noticeable folding, the shape trim can be adjusted to ensure symmetry of the wave fold.