user manual - MIDI hardware
Contents
1. 00 20 7A 02 01 lt channel gt lt event gt lt param gt F7 where lt channe gt parameter is MIDI channel number in range 1 16 01 10 in hex Table below describes meaning of both remaining parameters lt event gt MIDI event type meaning of lt param gt 01 Note on off starting note 02 Polyphonic Aftertouch ignored 03 Continuous Controller CC number 00 7Fh 04 Program Change ignored 05 Channel Aftertouch ignored 06 Pitch Bend ignored 10h drum trigger mode note number 00 7Fh In drum trigger mode available only via SysEx MINICV responds to only one note so several MINICVs can create multiple drum triggers in one channel If assigned note comes in GATE output goes active for entire duration of the note selected in lt param gt and CV outputs its Velocity 3 2 V oct scale tune FO 00 20 7A 02 02 lt tune gt F7 where lt tune gt is determining amount of voltage per one octave Possible values are 00 7Fh Tuning can be set in steps of 12 5mV oct in 4V range and about 15 5mV oct in 5V range Normal 1V oct scale is achieved when lt tune gt is 40 hex for 4V range and 30 hex for 5V range Tuning affects only note on off Any other events always use full voltage range 3 3 CV range select FO 00 20 7A 02 03 lt range gt F7 where lt range gt takes only one of 2 possible values 01 sets 4V 4 octave range and 02 sets 5V 5 octave range This also affects maximum voltage for a2. MINICV micro MIDI 2 CV device USER MANUAL Roman Sowa 2013 www midimplant com 1 Overview Thank you for choosing MINICV as your new MIDI2CV converter This short manual will guide you through installation and available settings The board was designed to be mounted where no other converter would fit most likely hand held battery operated instruments and noise boxes but also directly on VCO boards of analog synths No mounting holes are provided only a few soldering pads in narrower than usual 2mm spacing The connecting wires are enough to secure it in place as it weighs less than 1 gram There s 1 analog output capable to control analog synths with V oct scaling MINICV comes factory set to 1V oct scale at 100k load responding to MIDI channel 1 with C as lowest key The CV can be reassigned to different type of MIDI event not only keyboard notes this is described in chapter 5 The device requires only one positive power supply Simple setup like assigning channel and starting note can be done with MIDI learn button More options are accessible via MIDI System Exclusive commands All user settings are memorized in nonvolatile memory taking power off does not reset anything to defaults the settings are kept as they were last entered MINICV board described here is a product of MIDI hardware Roman Sowa ul Azotowa 15B 41 503 Chorz w Poland phone 48 532 425 835 email info midimplant com 2013 Roman Sowa ma
3. d It then goes up to 5V and stays there until all notes get released It is typical V trigger mode In all other events configured Gate output remains at OV It is possible to enable retrigger function so gate will go off for very short pulse between notes The gap is enough to retrigger envelope in most synths To have S trigger mode you may add single transistor Base to Gate output you may add 20k resistor before the Base Emitter to GND and Collector is your S trigger gate 2 2 MIDI THRU output MINICV repeats all incoming MIDI data at THRU output To connect DIN socket compliant with MIDI standard for MIDI THRU output connect the thru pad of MINICV to pin 5 of DIN socket Add 2200hm resistor between pin 4 of DIN socket and 5V that must be taken from somewhere outside MINICV MIDI pass thru output is not actually typical MIDI THRU found in most instruments It regenerates input signal so you can chain limitless number of MINICV boards without problems that would normally occur in regular long MIDI THRU chains Unfortunately it introduces a short delay of about 0 3ms so practical limit for number of chained devices is about 20 50 until the latency of last unit will be noticeable or annoying depending on attack time of the sound 2 3 MIDIi learn input MIDI learn is an input for optional momentary switch for setup basic operation MIDI channel event and starting note if the event is note on off To use learn mode short t
4. de in Poland EU manual edition 6 2 Layout Picture below explains all connections in MINICV board They are e MIDI input 1 2 MIDI pass thru output 3 Gate output 4 MIDI learn input 5 CV output 6 GND 7 Power supply 8 The board has no holes for mounting screws It can be soldered to synth circuit as additional component it s the size of integrated circuit and can use leading wires as support like SIP MIDI IN signal DIN socket pins 4 and 5 should be connected to pads 1 and 2 as indicated in the picture Polarity does not matter Middle pin of DIN socket number 2 must not be connected anywhere it must be left open to comply with MIDI specification In the upper right corner there s tiny trimmer for fine tuning the V oct ratio Its tuning ratio depends on V oct scale and resistance of connected CV input At typical 100k load and 1V oct scale it has a full turn range of about 5 mV oct 1 Power supply Make sure that all leading wires are as short as possible especially the one connecting GND ground OV potential The best way to place the module is inside VCO circuit or at the star ground in power supply where tuning reference point can be easily found The quality of ground connection directly affects the quality of generated Control Voltage MINICV is designed to work with supply voltages commonly found in synths It requires only one supply from 5V to 15V Current drawn is about 1mA Power input must b
5. e DC Connecting AC power or reversing the power leads will immediately damage the board 2 Connections 2 1 CV output CV output has adjustable resistance so any scale select and fine tuning should be done after all connections are in place At 100k load it gives 5mV oct tuning range Larger changes are of course possible with Sys Ex settings from 0 05V oct up to insane values of several volts per octave If CV input resistance of your VCO is lower fine tuning range increases for example at 20k it s 25mV oct The range of CV output is user selected between 2 levels Default is 4 octave range and 0 4V output This one is well regulated and does not change with temperature or supply voltage It is primarily intended to use as CV source for VCOs The other CV range is 5 octaves and 0 5V It can be used for applications where precision is not a must like modulation drum trigger etc This range is not so well regulated it may slightly change with temperature and supply voltage although the change is minimal enough to use in most applications without noticing CV can work also in reverse giving full voltage at lowes note and OV at top note This can sometimes greatly simplyfy MIDIfication of instrument when it s easier to have it in reverse This is configured by Sys Ex only The CV output can respond to one of several MIDI events They are Note on off Note velocity Pitch Bend Continuous Controller Program Change Channel Afte
6. his input momentarily to ground and the first MIDI data received will become the one that MINICV will respond to afterwards MIDI events possible to set this way are all listed in chapter 4 1 3 User settings After successful installation you can set up the MIDI event CV range and gate polarity To do so your synth must be powered on and you need the MIDI learn button connected or have any kind of Sys Ex editor There are 6 parameters to set 1 V oct scale tune CV voltage range 4 or 5V Gate polarity CV polarity 6 U AUW NN MIDI channel and event for CV gate gate retrigger Only the first setting channel and event can be done both ways via MIDI learn button or Sys Ex All other ones are accessible via Sys Ex only The System Exclusive command s structure is as follows Sys Ex header F0 manufacturer ID 00 20 7A device ID 02 command 01 08 related parameters and Sys Ex footer F7 This is described in details here All numbers are represented in hexadecimal format You may use any kind of Sys Ex editor to send those commands to MINICV 3 1 Channel and event Channel and event can be set by MIDI learn button or Sys Ex For example to make MINICV respond to your keyboard push the MIDI learn button momentarily and play the lowest note Same thing if you want to assign Pitch Bend or other MIDI parameter push the button and move the MIDI controller The same settings via System Exclusive FO
7. ll MIDI events other than notes Please bare in mind that 5V range is not guaranteed to be precision and particularly stable 3 4 GATE polarity reversal FO 00 20 7A 02 04 lt polarity gt F7 where lt polarity gt determines how active note is indicated at Gate output If lt po arity gt is 00 note on means 5V and note off OV If lt polarity gt is 01 note on means OV and note off is 5V 3 5 CV polarity FO 00 20 7A 02 07 lt polarity gt F7 where lt polarity gt determines how the voltage changes depending on note received When lt polarity gt 00 CV outputs OV at lowest note and 4V or 5V see 5 3 when the highest note was played When lt polarity gt 01 CV is 4V or 5V at lowest note and OV when the highest note was played 3 6 Retrigger mode FO 00 20 7A 02 08 lt retrig gt F7 where lt polarity gt determines if there should be retriggering pulses between notes When lt retrig gt 00 playing legato results in flat Gate signal When set to 01 gate will go off for very short pulses at the beginning of each note in legato group 3 7 Factory defaults Send this Sys Ex sequence to MINICV to go back to default settings FO 00 20 7A 02 01 01 01 24 F7 FO 00 20 7A 02 02 40 F7 FO 00 20 7A 02 03 01 F7 FO 00 20 7A 02 04 00 F7 FO 00 20 7A 02 07 00 F7 FO 00 20 7A 02 08 00 F7 The above Sys Ex commands must not be sent immediately one by one make sure to add at least 10ms delay between each line MINICV is configured then a
8. r Touch e Polyphonic After Touch Control Voltage goes down to OV and reaches up to 4 or 5V depending on selected range It makes 49 or 61 note range for 1V oct scale If CV is configured as MIDI event different than notes OV represents lowest MIDI value and 4V or 5V is output when highest MIDI value is received All MIDI events other than notes are represented in voltage as one of 128 levels except Pitch Bend working with much better resolution Neutral position of Pitch Bender is half of the selected voltage range at CV output For note on off CV scale can be adjusted in wide range from 0 05 to about 2V oct If the scale is higher than 1V oct there is of course no room for 61 notes in 5V range or 49 notes in 4V range so actual usable range is limited by highest achievable voltage Every note higher than that gives maximum available voltage 4 or 5V selected 2 1 Gate output Gate output is push pull type meaning it can source and sink current with 5V active state and 1k output resistance Gate polarity can be reversed by settings 5V for note off and OV for note on it may be useful in some synths or if you want to achieve higher gate voltage with single external transistor Also it is useful in S trigger circuit requiring only one external transistor The Gate pulses voltage indicating the duration of MIDI note When MINICV is configured to respond to MIDI notes gate output remains at OV until any note from valid range is playe
9. s follows note range C2 C6 36 84 in MIDI note numbers channel 1 4V precision voltage range OV at C2 4V at C6 1V oct scale assuming 100k load at CV output positive gate off OV on 5V without retrigger
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