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==5U Module Information==
[[File:Hordijk_osc_fc.gif|thumb|right|200px]]▼
The 2U wide Harmonic Oscillator module (OSC HRM) is used to create pitched waveforms with▼
▲The Harmonic Oscillator module (OSC HRM) is used to create pitched waveforms with
dynamically controlled timbres. Pitch control law is 1V/Oct and the module uses a platinum
element for temperature stabilization of the pitch curve. Maximum frequency range is from
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With only one OSC HRM and one DUAL ENV module you can already have a voice with
dynamic timbral and volume control that can do e.g. a pretty solid bass line
▲[[File:Hordijk_osc_fc.gif]]
[[File:Hordijk_dp.gif|thumb|right|200px]]▼
The Dual Phaser is 2U wide and has an internal CV voltage scale
▲The internal CV voltage scale is 1V/Oct. Each phaser has a reasonably accurate one volt per octave direct control input that can track the keyboard voltage. Normalization is used, routing the V/Oct input signal of phaser1 into phaser2 when the phaser2 V/Oct input is left unplugged. Total control range is about 18 octaves. The Frq knob goes over the top 9 octaves of this range. Through the V/Oct and Modulation inputs you can go deeper, but you get into the LFO range and audible phasing effects would disappear. It is however possible to use the phasing effect on LFO control signals in the 1Hz to 10Hz range by supplying the V/Oct with e.g. a fixed -5V control signal, which can create quite interesting LFO effects on e.g. drones. All inputs and outputs are DC coupled, so CV signals can pass the module equally well as audio signals. Only the internal resonance is AC coupled, so resonance drops off below roughly 10Hz. Additionally each phaser has a modulation input, also at 1V/Oct when the mode is set to sweep. When the mode is set to spread it behaves like the modulation sensitivity is halved, also when it is in half mode where only half of the poles in each phaser are modulated by this input. These inputs are not normalized, in fact if no plug is connected the modulation level knobs receive a fixed voltage so a manual spread value can be set. Audio input is maximum 12V peak/peak before clipping occurs and there is 6dB attenuation from input to output to enable resonance peaks without clipping. Audio routing is as follows: If a jack is connected to input1, and if input2 is unconnected, then the audio will route into both phasers. In this mode you can use the two phaser outputs as a stereo signal. Connecting a jack to input2 will override this internal input1->input2 connection and separate both phasers. If audio is routed into input1 and if input2 is left unconnected, and if a jack is connected into ónly output2, then the two phasers are automatically set to "inverse parallel" mode. Meaning that if both phasers are set to exactly the same knob settings the phaser outputs would be in exact reverse phase and thus result in almost silence. If audio is routed into input1, and if output1 is connected with a short cable to input2, and if output2 is taken as the overall output, the two phasers are in series and thus result in one 16-pole phaser. To summarize: you can use the phasers fully separated, parallel with two (stereo) outputs on one input signal, parallel with mono output but with one phaser in reversed phase before the mixing of the outputs of the phasers take place on output2, or in series. All this is accomplished by the internal switches in the connectors and only depends on which inputs and outputs have a plug."
▲[[File:Hordijk_dp.gif]]
[[File:Hordijk_am.gif|thumb|right|200px]]▼
The 4U wide Active Matrix module is a fully buffered eight by eight matrix where any one of eight▼
▲The Active Matrix module is a fully buffered eight by eight matrix where any one of eight
input signals can be added to any one of eight outputs. By using ¼-inch tip-ring-sleeve insert
jacks for the matrix nodes (equal to stereo jacks) a whole range of applications become
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Matrices with bigger sizes can be built on demand. Input columns come in multiples of eight
and any number of output rows are possible.
▲[[File:Hordijk_am.gif]]
[[File:Hordijk_mb.gif|thumb|right|200px]]▼
The 2U wide MiniBay is a smaller version of the Active Matrix. It has a four input by six output fully▼
▲The MiniBay is a smaller version of the Active Matrix. It has a four input by six output fully
buffered matrix plus two passive multiples with five jacks each. The matrix section works
exactly like the 8x8 Active Matrix.
▲[[File:Hordijk_mb.gif]]
[[File:Hordijk_de_fc.gif|thumb|right|200px]]▼
The 2U wide Dual Envelope Generator module (DUAL ENV) is a fully voltage controlled envelope generator▼
▲The Dual Envelope module (DUAL ENV) is a fully voltage controlled envelope generator
specifically designed to be used with sequenced music. There are two different types of
envelopes available, one is a four stage (attack, decay1, break level, decay2, release) envelope
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the velocity CV or CC# CV outputs of a MIDItoCV converter, but when modulated from
other sources one might need an extra CV mixer module to set the modulation levels properly
▲[[File:Hordijk_de_fc.gif]]
[[File:Hordijk_pf_fc.gif|thumb|right|200px]]▼
The 2U wide Phaser Filter module combines 5 allpass poles with three lowpass poles in one module.▼
▲The Phaser Filter module combines 5 allpass poles with three lowpass poles in one module.
The five allpass poles are configured as a phaser with positive feedback resonance control,
creating two resonant peaks when opened. Then a crossfade knob fades between the input and
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material away like a normal filter does but to also produce new material not present in the
input signal and combine the both to create a vast range of possible timbres.
▲[[File:Hordijk_pf_fc.gif]]
The purpose of the rungler is to create short stepped patterns of variable length and speed. One could categorize the circuit somewhere halfway between a plain S&H and a shiftregister-based pseudorandom generator. It needs two frequency sources to work and basically creates a complex interference pattern that can be fed back into the frequency parameters of the driving oscillators to create an unlimited amount of havoc.
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The rungler will try to find a balanced state. In this way it behaves according to principle from Chaos Theory. There seems to be an unlimited amount of possible balanced states and when a balanced state is just slightly disturbed it can be noted that it takes a little time to find the next balanced state, with noticeable bifurcations, etc. Note that a new balanced state is defined by the exact position of the control knobs plus the previous state it was in.
▲<b>Dual Fader</b><br>
The DualFader contains two RMS 'equal loudness' voltage controlled faders with both two inputs and two outputs. Depending on how jacks are connected the basic functions are crossfader, panner or alternating VCA. There are some extra options, e.g. the output from the first fader is internally connected with an extra signal path to the second fader, depending on a switch this option adds the output of the left channel or the crossfade product to the next fader with its own level knob, or make the second crossfader act as a DC-coupled ringmodulator on the first fader crossfade product. Because the midpoints of the faders are at -3dB to get the equal loudness fader curve the ringmodulation has a compressive distortion that will increase when the modulating level is increased, which sounds like the vintage 'diode-transformer' ringmodulators that were used in the fifties and sixties.
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Basically the DualFader is an elaborate voltage controlled mixer module with several options useful for different applications for dynamic signal routing and sound synthesis.
As the input jacks are normalized, the filter can also be used to create a variable slope for one input signal. As when a signal is connected to only the LP input the normalization passes the signal on to the next HP and BP inputs. This way you can set the slope with the LP, HP and BP input level controls.
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Faceplate = Dotcom but can be terminated to MOTM power and drilled accordingly. Cannot be resized, as is the case with all his modules except the Dual Phaser. The Dual Phaser can be made at the standard MOTM size.
[[File:181_trilfo_1.jpg|thumb|right|200px]]▼
▲<br><b>Triple LF-VCO</b><br>
It contains 3 CV controlable LFO's or as Rob calls them LF-VCO's.
One LF-VCO has a triangle and an inverterd triangle output. Rate goes from several minutes to 100Hz.
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The modulation inputs of all VC-LFO's are normalized at the input connectors in such a way that everything can crossmodulate and sync.
▲[[File:181_trilfo_1.jpg]]
==External links==
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*[http://electro-music.com/forum/forum-185.html Rob Hordijk DIY Designs], Electro-Music forum
*[https://www.youtube.com/playlist?list=PLAC347DE38ABA9E8D Rob Hordijk explains his modular designs] at the European Electro Music Event 2012 that took place in Mallorca, Spain.
[[Category:Rob Hordijk DIY Designs]]
[[Category:5U companies]]
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