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Kilpatrick Format

Technical Specifications

Kilpatrick Format

Technical Specifications

A Specification and Guide for Module Designers

Copyright 2014: Kilpatrick Audio / Andrew Kilpatrick

Written by: Andrew Kilpatrick

07/02/2014

Page 1 of 29

web: www.kilpatrickaudio.com – email: [email protected]

Summary of Contents for Format

Page 1: ...patrick Format Technical Specifications A Specification and Guide for Module Designers Copyright 2014 Kilpatrick Audio Andrew Kilpatrick Written by Andrew Kilpatrick 07 02 2014 Page 1 of 29 web www kilpatrickaudio com email info kilpatrickaudio com ...

Page 2: ...Spacing 12 Top PCB to Bottom PCB Spacing 13 Enclosures 14 Module Mounting Plate 15 Power Supply 16 Active Passive Enclosure Interconnect 17 Connecting Multiple Active Enclosures 17 Power Wiring and Power Supplies 18 Analog and Digital Grounds 18 System Power Grounding 19 Power Supplies on Modules 19 Audio and Control Signals 20 Signal Impedance 20 Input and Output Voltage Range 20 Gates and Pulses...

Page 3: ...ply Using an Opamp 26 Going Between AGND and DGND 27 Appendix A Part Reference 28 Appendix B Module Reference Drawings 29 Appendix C Enclosure and Power Supply Drawings 29 07 02 2014 Page 3 of 29 web www kilpatrickaudio com email info kilpatrickaudio com ...

Page 4: ... Easy Plug in System makes installing and removing modules easy no panel screws used Simple module construction improves design work flow and removes guess work all modules fit all enclosures Improved Electrical Properties 15V rails plus separate analog and digital grounds provide a better electrical environment for circuit designers Banana Cables for Patching the use of standard banana connectors...

Page 5: ...ht and although I could have copied their proprietary formats there were aspects that bothered me I finally came up with what I feel lends itself to easy module design Products can be built in small quantities important if you want to offer a lot of modules on a built to order basis It has good electrical characteristics feels good physically and uses all off the shelf parts which should make bout...

Page 6: ...ou undertake your design This help customers who purchase modules to know that they are getting a quality product that will work well with existing and future module designs from other manufacturers Keep Kilpatrick Audio Informed Use of the Kilpatrick Format is free of charge but you must tell us if you release a module so that we can keep track of products available in the format We will also off...

Page 7: ...els are the most useful sizes although three and four spaces can be made as well You must not make modules wider than four spaces because all modules should fit into a rack mounted enclosure The corners of modules are always rounded with a 0 125 radius to make them less sharp and also hide small alignment problems when the modules are sitting next to each other If you have an idea for a huge modul...

Page 8: ...dized aluminum Kilpatrick panels are vertically brushed and anodized and screened with black epoxy ink Other finishes are acceptable such as powder coating Panels must be made from metal The panel thickness must be 0 062 to ensure that all module faces are aligned when installed in a system Note The use of PCB material or acrylic as a panel material is not acceptable If these materials are require...

Page 9: ...etaining feature is accomplished by a nylon insert lock nut underneath the PCB A hole in the top panel gives access to the bolt The module can be secured by gently tightening the bolt When banana cables are pulled out many at a time the bolt keeps the module from pulling out of the enclosure In production the nut should be tightened part way to allow some play in the bolt The spacer prevents over ...

Page 10: ...al internal toothed lock washer on the top side of the lower PCB Locktite blue medium strength is used sparingly on each bolt to help keep the bolts from loosening but not enough to prevent good electrical contact as the bolts are used to couple power to the lower PCB The plugs supply the four power signals 15V 15V AGND and DGND Note that the AGND plug is aligned differently thus providing a keyin...

Page 11: ... compromise but must be kept within a tight tolerance to avoid height problems when plugging the module into an enclosure Notes about the photo LED spacers used throughout banana jacks metal tab soldered to top PCB through 0 197 hole 30mm pots and standard toggle switches can be used shorter parts and specialty displays etc should use daughter PCB mounted to top PCB 07 02 2014 Page 11 of 29 web ww...

Page 12: ...ower plugs are used on space 1 and 3 but not in the center 2 space Similarly only two retaining bolts are used Panel to Top PCB Spacing The spacing from the panel to the top PCB is nominally 0 562 9 16 plus the thickness of an M3 external tooth lock washer The overall height is approx 0 587 Round un threaded aluminum spacers are used between the panel and top PCB to create a ground connection to t...

Page 13: ...n all designs The possible location of the headers is chosen per design Alternately a dual row header could be used for denser modules The combination of a standard male and female header results in precisely 0 437 7 16 spacing between PCBs When choosing stacking headers the male header protrudes from the bottom of the top module and the female header protrudes from the top of the bottom module Th...

Page 14: ...for use free of charge and drawings are available in Appendix C of this document These included drawings are for reference only For the latest drawings including DXF or IGES files of the enclosure for metal manufacturers please contact Kilpatrick Audio or see our website for download info 07 02 2014 Page 14 of 29 web www kilpatrickaudio com email info kilpatrickaudio com Fig 7 Enclosure 4 Space Ac...

Page 15: ...d in the bottom of the enclosure on 0 875 7 8 standoffs which provide an electrical connection to the main enclosure as well as supporting the plate at the correct height for modules to be installed 6 internal tooth lock washers used between the top and bottom screws and the metal ensures a good electrical connection so that the entire chassis is grounded to AGND Notes about the photo banana jack ...

Page 16: ...igns but allows the 15V supply to be increased simply by using a larger external power supply For digital modules that contain embedded computers for instance it might be necessary to have many watts of power on a single module The most economical route to this is to allow the end user to upgrade their external adapter A 24W unit is supplied by Kilpatrick Audio and is suitable for up to eight modu...

Page 17: ...d below because this allows better access to the power input jack and power switch on the rear of the active enclosure An important note about grounding is that the digital ground DGND from all modules and enclosures is returned to the power supply PCB where it is connected to analog ground AGND at a single point This prevents ground loops and noise from being injected into sensitive circuits AGND...

Page 18: ... current in and out of the ground connection will cause voltage drops on the ground wiring within a system which will be added to CV and audio signal paths The Kilpatrick Format system uses separate analog and digital grounds AGND and DGND to solve this problem Analog grounds are used for signal returns references for analog circuits ADCs and DACs and other low noise circuits Digital grounds are u...

Page 19: ...rtant that the voltage drop and tolerance of the main power supply and linear regulators on modules be taken into account Kilpatrick Audio modules use Schottky diodes on both the main power supply and also the 15V and 15V inputs on each module This offers minimal voltage drop and permits the use of standard linear voltage regulators for 12V and 12V For 3 3V linear supplies for DACs and the like us...

Page 20: ...s specifically the output impedance should be 100 ohms This helps to avoid tuning errors with pitch oscillators All inputs must have an input impedance of 20K ohms or more Generally 30 50K is best as this allows multiple inputs to be fed from a signal output without appreciable loss of signal level Pitch V octave inputs on oscillators should have an input impedance of 100K or more Grounded when of...

Page 21: ...gnals When an envelope is triggered it rises from 5V through 0V to 5V and then back down again VCAs and VCFs should be designed to handle this range of input This solves a common problem on other systems where there are both unipolar and bi polar signals which are not inter compatible Indicator LEDs Although the display and user interface choice is up to the designer several LED colour standards h...

Page 22: ...ng practice and others were devised for the Kilpatrick Format and seem to work well Module Power Supply Example Notes about the example D5 6 are Schottky diodes for minimal voltage drop C16 is 10uF to prevent too much capacitance on ve supply D1 2 help to protect the module in case one of the grounds is missing standard silicon diode is used for low capacitance 10pF for a 1N4001 07 02 2014 Page 22...

Page 23: ...K and also shift the threshold voltage to just over 1V for a typical small signal transistor diode prevents negative base voltage transistor collector can be pulled up to whatever voltage the output needs output signal is inverted 07 02 2014 Page 23 of 29 web www kilpatrickaudio com email info kilpatrickaudio com Fig 11 Pulse Input Circuit ...

Page 24: ...the example input and output are in phase different configurations can be chosen for different gain and offsets a simple unity gain buffer can be used for 5V signals 07 02 2014 Page 24 of 29 web www kilpatrickaudio com email info kilpatrickaudio com Fig 12 3 3V to 5V Pulse Amplifier ...

Page 25: ...the same amplifier were used for signal output as well In many cases however simply using a single amplifier is sufficient Note Most of the circuitry driving a bi colour LED will be referenced to AGND However the cathode of the LED should be tied to DGND This prevents the large LED current from returning into AGND and potentially causing voltage drops on signal returns 07 02 2014 Page 25 of 29 web...

Page 26: ... current split references useful for powering 4000 series CMOS muxes which require 20V voltage is easily adjusted with a resistor divider small filtering and bypassing should be used at loads 07 02 2014 Page 26 of 29 web www kilpatrickaudio com email info kilpatrickaudio com Fig 14 Split Supply Op amp Circuit ...

Page 27: ...hese diodes have very low capacitance to avoid coupling noise between grounds and also require an imbalance of around 0 6V in either direction before they will conduct For ADC and DAC digital signals connecting between microcontrollers or DSPs on DGND and the converters on AGND some series resistors 100 ohms works for speeds up into the MHz will prevent excessive current flow in case the chip supp...

Page 28: ... supply small pushbutton TE FSM16JH configuration resetting test LED spacer 0 500 Bivar LTM 500 all LEDs stacking header male FCI 68001 220HLF board to board stacking header female Sullins PPPC201LFBN RC board to board banana jack black Emerson 108 0903 001 audio CV input banana jack grey Emerson 108 0913 001 audio CV output banana jack white Emerson 108 0901 001 pulse gate input banana jack red E...

Page 29: ...y Drawings The following documents are available regarding enclosures and power supplies These are free to use as long as they are not made or sold as Kilpatrick Audio branded products Note These files come with no warranty and should be used as reference only It is up to the user to verify accuracy before any design or manufacturing andrew_enclosure verC zip 4 space rack enclosure design K0 power...

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