MIDI2CV interface for analog synthesizer

> MIDI2CV converter - specifications and ordering info

MIDImplant is a special circuit needed when you want to control your older analog synthesiser with MIDI. As long as your instrument has volt/oct response (in contrary to Hz/volt) you can use this little board. It's calibrated at 1V/oct, but any ratio is possible, from 0.3V/oct to 2V/oct. Hz/V response will be available too, as one of the features of new firmware being under development now. You only need to drill a hole for MIDI DIN socket, and connect a few wires inside your synthesizer. Basic soldering skills are needed as well as a bit of knowledge about your synth. Its service manual, or at least schematic is most helpful.
Both CV outputs are monophonic, that means each of them can control one oscillator. They use last-played note priority. It means that whatever the note was played, it's immediately converted into proper voltage, regardless of the keyboard state before hitting the new key (if there were other keys pressed or not). If some of pressed keys are then released, CV output changes to represent the highest remaining note currently played on the keyboard. If the last key is released, CV remains at the level as before the release. Although this description may not seem obvious, described mode of operation is probably the most intuitive way of controlling pitch for monophonic analog synths.

CAPABILITIES

Up to 61 keyboard range for tandard 1V/oct ratio
Fast response - valid CV and Gate voltages appear 0.3ms after MIDI transmission ends.
Voltages are generated with precision better than 2 cents (2/100 of a semitone) at 1V/oct ratio
User selectable Volt/octave ratio with resolution of less than 1mV/oct, easily adjusted with use of MIDI keyboard - no trimming screwdriver needed
Standard version works with V-trigger type of gating signal. Gate ON level is equal to the power supply voltage delivered to MIDImplant. For S-trigger compatible synths, order MIDImplant-S.
Each output of MIDImplant can be easily configured by the user to generate voltage representation of MIDI signals like:
- MIDI notes with velocity. One input represents pitch, the other one velocity, while GATE1 controls the note duration.
- MIDI notes on 2 different channels. Each Gate output works together with paired CV output.
- MIDI pitchbend with resolution of more than 4000 steps
- Any of 128 available MIDI Continuous Controller, e.g. volume, modulation, etc.
- Channel Aftertouch, and Polyphonic Aftertouch
- MIDI Program Change - voltage level represents Program number received via MIDI
Both inputs can work independently, that means one can be notes, the other - velocity. Or both can represent pitch of notes on different channels. Or one can be Pitchbender, and the other one - modulation. Combinations are endless.
Each input can work on user defined MIDI channel, but if MIDI OMNI ON mode is selected, both outputs respond to MIDI signals on any channel
Both CV outputs can generate voltages in range between 0V and 5V
dimmensions: 15x36mm (0.6''x1.4'') without MIDI socket

INSTALLATION:
In order to install this device you need to find some key points inside your to-be-MIDIfied instrument: power supply output (between 6 and 15V), ground (0V), and control voltage (CV+GATE) inputs. Most important is Voltage Control pitch input of your synth oscillator, or a point in the circuit where you can add it (usually it takes just one resistor to have CV input). Another important voltage is GATE signal, that drives the envelope generator. GATE is activated whenever a key is pressed on a keyboard, while CV input tells the instrument about the pitch to be played. MIDImplant module provides 2 pairs of such signals. That means you can control 2 oscillators, or make just one oscillator MIDI controlled, together with other control like most common VCF cutoff frequency.
This picture gives you idea of the size and destination of this board. It is designed to be mounted on MIDI-IN socket only, no additional mechanical assembly is required. Just slide it inside thru the hole and secure the MIDI socked with use of 2 screws. Not shown are cables, which must be soldered inside the synth. Those are: GND, power supply (6 to 15V), 2 CVs, 2 Gates, and the one for "setup" button

USER SETTING
Thanks to user friendly MIDI-learn function, you only need to press the EDIT button once, and generate the MIDI event you want to associate with CV output. For example to setup it as note+velocity, press the EDIT button once, and play the lowest note on your MIDI keyboard. The module is ready to work with your keyboard since then.
User settings are of course stored in nonvolatile memory, so you don't have to mount any button for setup. Just use a piece of wire connected to GND to activate edit mode during installation, any you will never need to change it again after you close the synth case.

This board is finally ready to order, for 80EUR including shipping worldwide via registered priority mail. Send all questions, comments or orders to info (at) midimplant (dot) com
You can make the payment now by clicking one of the 3 on-line payment buttons, or by making bank money transfer. All details are shown in table below:

payment details
BANK TRANSFER	LUKAS Bank SA, pl. Orlat Lwowskich 1, 53-605 Wroclaw, Poland IBAN: PL57 1940 1076 3027 4037 0000 0000 account owner name: Roman Sowa BIC/SWIFT: LUBWPLPRXXX
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