Midimuso MDCO-3 Manual Download Page 2

Contents

Page

Pinouts

3

Chaining MDCO-3s together 

3

Modes, setting and changing

4

Using the Auxiliary Triggers / gates

5

Changing Settings:

6

Changing Pitch bend range
Setting Oscillator Pulse Width
Setting Oscillator Detune

Circuit: Setting up and calibration

7

What is high-resolution “8 + 8” fast PWM?

8

Suggested Analogue Circuits 

9

Summary of Contents for MDCO-3

Page 1: ...hich use the Volts Hz pitch system Pitch range of 8 octaves MIDI keys C0 to C8 i e 32 5 Hz to 8 4 kHz Pitch accuracy of 0 0006 of one semitone at Middle C Pitch Bend range can be set by user Guarantee...

Page 2: ...ng and changing 4 Using the Auxiliary Triggers gates 5 Changing Settings 6 Changing Pitch bend range Setting Oscillator Pulse Width Setting Oscillator Detune Circuit Setting up and calibration 7 What...

Page 3: ...Chips are connected together with a resistor of 220 Ohms from pin 3 of one chip to pin 2 of the next chip You just need to connect the resistors The chips detect chaining automatically at power up Al...

Page 4: ...sent on MIDI channel 1 Both on chip oscillators play the same note detuning is available If more than one note is sent it will be passed on to the next chip This allows polyphony with one note per ch...

Page 5: ...rs 1 to 9 correspond to keys middle Key Trigger middle C 1 C 2 D 3 Eb 4 E 5 F 6 F 7 G 8 Ab 9 Chip 1 is on MIDI channel 13 Chip 2 is on MIDI channel 14 Chip 3 is on MIDI channel 15 Chip 4 is on MIDI ch...

Page 6: ...ith a pitch of Eb above middle C MIDI bytes 0x90 0x3F 0x7F Send a Program Change 3 message Send note on with a pitch of G below middle C MIDI bytes 0x90 0x37 0x7F Setting Pulse Width Pulse width is se...

Page 7: ...to allow you to balance this with great precision using just an audio amplifier To calibrate the circuit 1 Send MIDI Program Change 6 to the chip This puts the chip into Test Mode for both A and B osc...

Page 8: ...millivolts or so with the lower voltages This circuit gives best results if P1 is set so that A4 is giving exactly 0 440 volts Small errors in the lowest and highest octaves are much less noticeable S...

Page 9: ...be used for pins 5 and 17 to smooth the PWM outputs Midi Clock pulse length 1ms 5 Volts This signal is output from the 1st chip only if chips are chained Improvements The circuits given will allow a q...

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