assembly manual - hexinverter.net
Contents
1. ve built both of your seqSQUARED boards now Awesome Now it is time to connect them together and begin testing your work Inspect Your work Don t even think about going ahead until you have thoroughly gone over your work for solder shorts missed soldering points or other defects Double check that your power connector is oriented correctly and that you are not going to connect the power backwards Connect the Boards Together Grab the 1x 40pin male and 2x 20pin female 1 headers and snap the 40 pin one in half Decide which board you want to have male headers and which you want to have female Now lock the headers together in twe male female pairs the same way they will be when the boards are connected together Place the header pairs in the holes on the BOTTOM of the logic board the wrong way from all of the other components an then place the control board on top of that allowing the header pairs to be sandwiched between the two boards Now try to ensure the headers are straight as you solder them in place on the boards from both sides This process of locking them together before soldering will mean that they are soldered such that they can be removed easily if the need arises Testing Your work If you are building a universal module feel free to attach your flying leads to the panel components now next page Test the LEDs I recommend taking a multimeter or a current limited DC power source d2. IC8 7805 a3 yie TLaz4 TA Cte AUF 4 1 6N IC7 g ai oR g PE seQgSQUARED HEXINVERTER NET e_o e oielojeloioleiolejojeioiololoiojoelo ps eEoeceeoeeeoeoeeeoeeesea D BS aR O C RE RE mE fy 20390A SS AAA Og QU 00 T41 2N3986 I recommend having a computer with this manual and the bill of materials beside you for the assembly You can always print this manual as well but think about the environment before you do that If you can use a comput er Begin by rounding up your components and PCBs wWe 11 start with the logic board since this is pretty much the same for all kit types I m not show ing a whole lot of images here because I assume at this level you have en countered all of this at least once before If you are not using the kit components I provide the instructions may differ For example the 1yuF decoupling capacitors I supply are axial and therefore are lower on the PCB than the IC sockets so I say to in stall them before the sockets If you ve sourced your own however they may be taller and therefore you might want to change the assembly order begin on next page STEP 1 Resistors The first step is to install the resistors as per the value markings on the board I have designed the board s silk screen
3. so you should be able to simply look at the board and tell where everything goes This is all Standard stuff for you at this point right Use a multimeter to iden tify the values if you are lazy or you can use your eyeballs with my handy chart I ve made for you here note that these colours are for the 1 variety I include in the kits if you sourced your own parts you re on your own BROWN BLACK BLACK ORANGE BROWN BROWN BLACK BLACK RED BROWN YELLOW PURPLE BLACK RED BROWN BROWN BLACK BLACK BROWN BROWN BLUE GREY BLACK RED BROWN STEP 2 Diodes Next up is the diodes There are a lot of diodes in this design to protect the PIC from input voltages Vimu that do not fall into the OK lt V naput SOV range that the microcontroller can handle I certainly could have used some opamp trickery to scale voltages down until the PIC microcontroller was happy with them but then you would be soldering a bunch of opamps and resistors instead Either solution works well but since a 12v CV range for the CV inputs on seqSQUARED wouldn t really be any more useful than the 0 gt 5V range it can handle I did not really see the point in spending more time with it I also wanted to learn about clamping diode setups and thus chose to have fun with that solution instead All of the diodes on the logic board are BAT85 Schottky diodes There are 24 in total IT IS IMPORTANT YOU PAY VERY CAREFUL ATTENTION TO THEIR ORI ENTATION AS THEY ARE IN F
4. ACT POLARITY SENSITIVE STEP 3 Decoupling capacitors Install the 11x 0 1uF capacitors in their respective locations STEP 4 Quartz Resonator Install the 20MHz crystal X1 resonator in its place beside IC1 BE CARE FUL NOT TO OVERHEAT STEP 5 Resistor Arrays SeqSQUARED uses a special type of component called a resistor array Even if you are a seasoned electronics person this may be a new component for you to work with It was for me when I designed this project It is only with great scrutiny that I chose to use these devices in this project because they are not something everyone has in their parts bin The alternative however would be to bend the leads on install and sol der nearly 50 more resistors than you already have This would simply be too much to handle for you and for me since my retail volume is so low that I have to assemble these by hand for retailers to sell Enter the resistor array These little guys are 10 pin SIPs single in line packages that contain various configurations of resistors The types we are using here are of two varieties BUSSED ARRAY These contain 9 equal value resistors that are connected to a common pin ground in our case These are extremely useful for things like arrays of LEDs that are the same colour and thus require the same resistor value to set the brightness and pull down resistors ISOLATED ARRAY These arrays contain 5 individual resistors in a single pack
5. Ceramic Capacitors Install the two 33pF ceramic disc capacitors Cl and C2 beside the micro controller STEP 8 eurorack only Power Header Install the shrouded power header being careful to follow the polarity of the notch on the board silkscreen This is a standard Doepfer compatible layout but I recommend verifying it yourself before even thinking of ap plying power to the board STEP 9 Random Bits Install the three 10uF electrolytic capacitors silk screen shaded part NEGATIVE the LM7805 regulator and the two 2N3906 transistors being careful to obey polarity and not to overheat components If you are building a different format than eurorack you can add power wires now There are handy arrows with markings by the power pads that show you which pad is which You are now finished assembly of the logic board Do not install the headers or the ICs in their sockets yet we will do that later Control Board Assembly o aeee ses SLED3 SLED4 SLEDS SLEDS SEEDZ SbEN8 con ral veel c24 A 39k TAF RAS 2 E ED RRRC ooo PG4LED ey PG2LED 1k SU RST SW STEP 025 C20 289 o GUQUT DIV 3 pant ct 28k O 7 zm JOS ota HEXINVERTER NET 2 Pey SPR Ba BLUF ar l 148 EDIT KLED CHA CU This section will be divided into two parts One guide for eurorack build ers and another for builders who are using panel mount
6. E RIGHT WHERE THE METAL BUSHING ENDS YOU WANT TO CUT THE SHAFT OF EACH POTENTIOMETER DOWN TO 13MM see rendering on next page cut here 13mm measure here I recommend the use of tin snips or some heavy duty wire cutters like the big kind you d never use for the small electronics we do You could also use a hacksaw but that takes much more time You may need to file the edges a bit depending what cutting tool you use Test fit each knob on the pot before installing the pots in the board STEP 10 Install the Potentiometers Install all of the pots into their respective positions on the control board Tack one conductor of each pot with the panel installed re adjust ing as necessary just like in Step 8 to ensure they are installed cor rectly and flush against the board Once you are satisfied with their positions permanently fix them in place by soldering the remaining contacts You are now finished assembly of the control board The universal kit assembly instructions are next so you can skip ahead now to the final assembly and testing Universal Assembly STEP 1 Diodes Install the two 1N4148 or 1N914 diodes observing polarity STEP 2 Resistor Arrays Install the 3 resistor arrays in their respective locations being careful to align the pin 1 indicator with the square pad on the PCB 20k ohm 10A203 39k ohm 10A393 1k ohm 10B102 STEP 3 Capacitors Install the 5x 001uF and 1x
7. ER FORUM and we will resolve your issue PLEASE NOTE SeqSQUARED is an intermediate advanced project and thus I do not recommend it for total beginners There is a lot of panel wiring if you are not making the eurorack version and if something goes wrong it is not the easiest to troubleshoot That being said drop me a line via email if you need assistance hex at hexinverter net or stop off at the MUFFWIGGLER FORUMS and find the SEQSQUARED HELP THREAD Maybe someone else will know the answer for you and save me some valuable time to work on new projects with It 1S assumed that you know how to solder reliably and have built a few projects successfully already so that will not be detailed here If you need some help learning how to solder check out the introduction in the SYMPLESEQ BUILD MANUAL Frequently Asked Questions The FAQ can be found in the USER MANUAL Getting Started Before you begin I recommend thoroughly examining your kit s contents and comparing to the BILL OF MATERIALS to ensure that you have all of the parts to complete your build while quite rare I occasionally make a mis take when packaging a kit I am afterall only human unfortunately haha and thus sometimes fall victim to human error If you spot a compo nent missing please email me and we will resolve this matter for you Now settle down in your workspace and let us get started Logic Board Assembly c3 tur logic_v1 4 uF
8. O1uF capacitors in their respective loca tions FROM HERE ON OUT I RECOMMEND THAT YOU SOLDER WIRES TO THE CONTROL BOARD BUT DON T ACTUALLY SOLDER THEM TO THEIR CORRESPONDING PANEL COMPONENTS YET WE LL DO THAT AFTER THE FINAL ASSEMBLY BEFORE TESTING Wiring Diagram OL 2 OO SLEO4 SLED2 SLED3 SLED4 SLEOS SLEDS SEEDZ SbEN8 control _ v1 1 CU A S G A ne ak 7 2 1 Tey ts PLED4 Ce G B RSAC tnF 3271 CUB RISRC O la PLED2 PG4LED PG2LEO KLED GND Signal tip sleeve STEP 4 Jacks Each jack on the control board has a 2pin 1 header corresponding to it should you wish to use headers instead of tapping the jacks pins directly to run your wiring Look closely at the header sets and you will notice there is one circular and one oval shaped pad per jack The circular pad is a GROUND and the oval pad is your SIGNAL for that jack You could just ground all of your jacks on the panel if you like and only run a single ground as they are all actually the same grounding point STEP 5 LEDS Run leads for each of the 17 LEDs to your panel s LED locations Look at the eurorack panel rendering for ideas of how the controls work and where to place the LEDs On the control board the flat edge of the LED symbol indicates the negative lead of the LED STEP 6 Push Buttons Run leads for the three push buttons There are 4 pads for each but they are really just two c
9. PCB 20k ohm 10A203 ok ohm 1k ohm 10B102 STEP 3 Capacitors Install the 5x 001uF and 1x O1uF capacitors in their respective loca tions STEP 4 Read This This is where things get critical These next few steps can be viewed as one big step Install the Panel Components It is important that you DO NOT SOLDER ANYTHING UNTIL I SAY SO if you want to have a neat panel in the end It is also crucial that you take your time and inspect your work repeated ly to ensure that all of the components which go through the panel line up in away that is mostly uniform If you do not take care you will wind up with a crappy looking panel with jacks and LEDs and such all misaligned This is how I like to do mine but you may synthesize a better method Feel free to go with your gut feeling if you are experienced in these mat ters STEP 5 LEDS Gather your LEDs and LED standoffs the black plastic things You should have 8x green Step LEDs SLED1 8 5x red LEDs CLED PGILED PG2LED Prepare them jfor insertion into the board by installing each of the LEDs into a spacer DON T MIX YOUR LEDS UP I recommend inserting them in their place on the control board right when you install them in the spacers They are all clear so you would have to light each of them to test their colour if they get mixed up You can do this with a multimeter on diode test if you do mix them up Once the LEDs are all in the board ben
10. SEQSGQUAREH The Analogue Pattern Generator ASSEMBLY MANUAL REV 1 Brought to you by HEXINVERTER NET Introduction ABOUT THIS MANUAL Anywhere you see text coloured LIKE THIS indicates a hyperlink Click it to go to the corresponding page website Greetings Thank you for your interest in purchase of seqSQUARED It is my hope that you find whatever creative tool it is you are looking for in this design This project was made possible through the excellent online synth DIY com munity and their trustworthy attitudes As project funding was acquired through pre orders it wouldn t have been possible without the support of everyone that committed to pre ordering Thank you for making this happen This is the build manual for this project and will walk you through as sembling your seqSQUARED module You can find the USER MANUAL AT THE HEXINVERTER NET PROJECT SITE DISCLAIMER I know that I write a lot but it is FOR A REASON Please try to read all that I have written here I have spent many precious hours that I would have much rather spent designing new devices to develop this written manual so that others can build their modules smoothly I know most folks want to just skim over the manual but chances are if you have a question about the assembly or design of this module I have already an swered it here If I have not my apologies for wasting your time Please email me at hex at hexinverter net or visit the MUFFWIGGL
11. age that work the same as single resistors They have two connection points per resistor WHEN INSTALLING YOUR RESISTOR ARRAYS Be VERY mindful of the orientation THESE DEVICES ARE POLARIZED If you look at the writing on the array there is a solid dot marking pin 1 of the array Pin 1 is marked on the circuit board with a SQUARE PAD Make sure you line these up or seqSQUARED will not work properly The resistor array s value is marked using a code much like ceramic ca pacitors Here are the codes for the arrays used in this project 10B151 10B102 10A203 10A393 10A104 STEP 6 IC Sockets I HIGHLY RECOMMEND THE USE OF IC SOCKETS Without them if you burn out a chip due to faulty wiring or something you are in for a whole heap of trouble trying to desolder it and replace it For that reason my kits in clude very nice gold plated round machined pin sockets I encourage you to install all of the sockets in their holes at once then without soldering them yet place something flat on top of the sockets I use a piece of cardboard cut to the size of the PCB Grab this with your hand keeping pressure on the sockets through the flat material and flip the board over Now you can carefully remove the flat piece of material and use the flat work surface to level all of the IC sockets This greatly speeds up the process and does not require bending the sockets legs to make them stay in while you flip the board over STEP 7
12. d their legs but DO NOT SOLDER THEM YET STEP 6 Jacks with your LEDs just dangling in their places gather up your 14 jacks and insert them into the board where they are supposed to go Once again DO NOT SOLDER THEM IN YET STEP 7 Push Buttons Install the 2 white push buttons into the SwW RST and SW STEP holes in the board making sure the flat side is aligned with the silk screen legend Install the green push button into the SW EDIT position DO NOT SOLDER ANY OF THE SWITCHES YET STEP 8 The Tricky Part Now with everything but the potentiometers installed and loose in the board take your eurorack panel and slowly drop it down over the compo nents This is the tricky part you now have to flip the board back over without all of the parts falling out or at least most of them still in there when you have done that take your soldering iron and tack ONLY ONE LEG of each component in place Once they are all tacked flip the board back over and inspect your work Is everything aligned well when you look at the panel from the front when you look level at the board from the side are all of the components sitting flush against the board Are all of the LEDs at the same height Do the push button switches actuate freely when pushed through the panel Chances are some of your components probably fell out or are lop sided or uneven The push buttons may be rubbing against the panel holes Now you must take car
13. e to adjust components one at a time by re heating the single solder tack joint you made until all of the installed compo nents are satisfactorally placed Once you are satisfied with the position of everything solder all of the contacts to permanently fix the components in place STEP 9 Prepare the Potentiometers If you have ever designed a project before you probably know just how hard it is finding the perfect potentiometers for your design Please keep this fact in mind as you cut the included pots shafts wait what you say Yes You unfortunately have to cut the shafts down to length so the knobs sit at the correct height Unfortunately nobody seems to want to stock the correct length pots for 80 of the knobs they sell so we are forced to deal with this The Big Guys aka Intellijel Makenoise etc are all able to purchase directly from the potentiometer manufacturer I m sure so they get to or der the perfect sized pots direct As a very small volume manufacturer I am incapable of ordering 5000 pots at a time so bear with me here I have carefully chosen what I believe to be the absolute best feel ing potentiometer available that works for this project I sampled many of the options and chose the smoothest feeling pot It also happens to be very easy to cut due to the nice soft plastic used for the shaft so that works well for us MEASURING FROM WHERE THE BLACK PLASTIC SHAFT BEGINS I
14. ed components You might be wondering why you still have to build the eurorack control board using flying wires to your panel components instead of having a spe cial board made specifically for universal formats I thought about mak ing an extra control board specifically for universal builders that is sim ply a very easy to understand layout that broke all of the controls out to pads for easy wiring Unfortunately this just did not fit into the budget for the amount of people building universal kits PCBs that opted to sup port this project perhaps due to not knowing if there would be a pan el available or not which I am happy to say there WILL BE ONE FROM RE SYNTHESIS EVENTUALLY The added cost Cin both manufacturing and de Sign complexity time made it so that it was not an option So for you universal folks out there I HZGHLY recommend reading the guide I present here as I will explain exactly where to connect everything on the control board to wire up to your panel And in case you were wondering no I did not make this decision based on selfishness My own personal format is 4U with banana jacks so I have to go through the same process to wire up my own seqSQUAREDs EURORACK ASSEMBLY STEP 1 DIODES INSTALL THE TWO 1N4148 OR 1N914 DIODES OBSERVING POLARITY STEP 2 Resistor Arrays Install the 3 resistor arrays in their respective locations being careful to align the pin 1 indicator with the square pad on the
15. on t blow the LEDs and testing each LED to make sure it is correctly wired not burned out from heat It is possible that you have damaged one or more LEDs from soldering temperatures If one doesn t light up replace it Power up Test This is it Almost there WITHOUT ANY OF THE ICS INSTALLED IN THE SOCKETS power up your boards and take some measurements as per the following charts If anything is off here you know you have screwed up or reversed the power leads and thus save yourself the trouble of blowing a bunch of ICs with your multimeter on DC voltage measure these points referenced to ground of course clamp your ground probe to ground for all of these tests and then just probe around with the positive probe and ensure the voltage iS approximately equal to the expected values Test 1 5V Supply Pin 3 of IC8 should show roughly 5v Pin 11 of IC1 should show roughly 5v Pin 14 of IC7 should show roughly 5v Test 2 V Supply Pin 14 of Ic5 should show roughly your V supply voltage Pin 4 of Ic2 IC3 and IC4 should show roughly your V supply voltage Pin 8 of IC6 should show roughly your V supply voltage Test 3 V Supply Pin 11 of Ic2 IC3 and IC4 should show roughly your V supply voltage Pin 4 of IC6 should show roughly your V supply voltage That s it If any of the above tests failed you have something wired solder incorrectly or your power reversed Correct this problem bef
16. onductors connected inside the switch 2 pins per Switch conductor I have marked the pins that are the same point connected together with a line on the PCB silkscreen Connect one lead to each line It doesn t mat ter which pin on the line you select Run these lines to your momentary Switches on your front panel STEP 7 Potentiometers You must pay close attention here because if you wire a pot backwards you will have backwards the functionality you are expecting to have as they are wired as basic voltage dividers The pots used for the eurorack version are actually mounted upside down This makes it a bit confusing for you Csorry when you look at your panel mount potentiometer with the shaft facing you you have 3 leads 1 2 To match your panel mount pots to the pads on seqSQUARED simply look at the pots upside down so the seqSQUARED text on the control board is up side down Now the pin numbers match your panel mount pots perfectly I highly recommend soldering in colour coded sets of wires for the pots For example you could have a 3 conductor setup where Pin 1 Green Pin p on Pin 3 Orange Now when you are actually sol you know what pin each wire co it dering the wireg to the pots on your panel T ead of having to think about You are now finished assembly of the control board Go to the next page to do the final assembly and testing Final Assembly and Testing You
17. ore continuing if so You can now install the ICs in their sockets and power up If all goes well upon powerup the Step 1 LED indicator should be lit and the Source A indicator lit as well Carefully touch the Ics with your finger to test for heat If any of them are warm hot to the touch power down immediately and check for shorts If all is cool and fine go to the USER MANUAL and test using the quick start guide to see if your module works If it doesn t make sure to go back and carefully check your work and read the troubleshooting guide in the USER MANUAL
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