Barton Musical Circuits BMC58 Manual Download Page 1 | Manualshive

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BMC58. Yes No Maybe Sequencer

last updated August 28

th

, 2019

I. Using The Module

A. What does this do?
B. Controls
C. Changing Modes

II. Schematic

A. Master Schematic
B. Switches
C.Inputs
D.Outputs

III. Construction

A.Parts List
B.PCB Information
C.Wiring

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Summary of Contents for BMC58

Page 1: ...quencer last updated August 28th 2019 I Using The Module A What does this do B Controls C Changing Modes II Schematic A Master Schematic B Switches C Inputs D Outputs III Construction A Parts List B PCB Information C Wiring ...

Page 2: ... when fully clockwise all MAYBE steps will fire 3 MAYBE CV knob input The Maybe CV is attenuated by the CV knob and then mixed with the voltage from the MAYBE knob A negative voltage inputted will act like turning the MAYBE knob counterclockwise and a positive will act like turning the knob clockwise 4 Reset Button input The Reset button returns the sequence to step one on the next clock input It ...

Page 3: ...ound and the components on the bottom PCB have a yellow background On the next pages I ll show different sections of the project in easier to follow bits You may notice that the master schematic shows a 10K resistor bus in the following schematics these will be shown as 10K resistors On the right is an image of the pinout of the PIC ...

Page 4: ...the 4051 as are 2 and 10 etc The two outside lugs of each toggle are connected to the PIC with a 10K pull up resistor set to 5V When the CD4051 connects to ground for that switch if the toggle connects the PIC to ground through the switch and diode it tells the PIC whether or not to fire the output for that step The anodes of the LEDs are connected to a pin on the PIC through a 1K current limiting...

Page 5: ...ed to an opamp on the TL074 The opamps are wired as comparators with their thresholds set at 5V by the 10K 1K voltage divider Each comparator has a 100K resistor to ground on it s input and it s output goes through a switching diode to prevent negative voltage passing from the comparator s output to the PIC s inputs A 100K 100K voltage divider and a schottky diode connected to 5V prevent overvolta...

Page 6: ...lm unless otherwise noted on all resistors 1K ohm 8 100K ohm 11 10K 6 pin bussed array 1 SIP package or make your own B100K Pot 2 PC mounted 9mm parallel mount Like this Capacitors Value Qty Notes 01uf 6 Ceramic type Value not critical 10uf 2 2 5mm lead spacing Electrolytic 16V or higher Other Value Qty Notes 8 pin DIP socket 1 14 pin Dip socket 1 16 pin DIP socket 1 20 pin DIP socket 1 Power Conn...

Page 7: ...top of the bottom PCB and the top of the top PCB C Wiring Wiring is very simple The CLOCK TRIG RES GATE and CVIN wirepads all connect to the tip of the appropriate jack GND connects to the sleeve of a single jack if using a metal panel If using a nonconductive panel connect it to the sleeve of each jack On the next pages are photos of a completed build ...

Page 8: ...Here is a complete build using a home made resistor array ...

Page 9: ... wires to save on wire Above is a close up of the connection between the two PCBs Make sure you clip leads on the bottom side of the top PCB so they don t short against the 4051 that sits below the PCB There are holes in the PCB to use an optional spacer to keep PCBs seperated ...

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