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TubeOhm SMR4P Diy Manual

Multi vcf
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29.08.2018
TubeOhm SMR4P-multi VCF
DIY manual
© 2017 by TubeOhm
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Summary of Contents for TubeOhm SMR4P

  • Page 1 29.08.2018 TubeOhm SMR4P-multi VCF DIY manual © 2017 by TubeOhm...

  • Page 2: Schematics And Bom

    HP3LP,Notch,Phaser, Notch+LP1, Phaser+LP1. Voltage controlled 0..10 V • Current 30 mA on -12 V, 50 mA on + 12 V • Dimensions : 50,5mmx128,5mm = 10TEx3HE eurorack format • power +/- 12 Volt Schematics and BOM The BOM and the schematics can be found on TubeOhm.com...
  • Page 3 1:) Prepare the PCB Separate the PCB in three parts . Simply break the PCB into 3 peaces and cut with a cutter the little rest on the top and back of the PCB. break it into three peaces...
  • Page 4 cut the rest with a cutter smooth it with a file...
  • Page 5 Now we have three PCB's 1) the Pannel Board V 1.03 for the pots, LED's, plugs 2) the Control Board V 1.03 for the CPU,and the pole mixing 3) the Analog board V 1.03 the complete filter board Let us start with the analoge board V 1.03 first we solder all resistors and coils - diode second...
  • Page 6 we start with R 59 = 68ohm Image Description Quantity Notes Blue, gray, black, gold brown 68 ohm than 5 x 220 ohm Image Description Quantity Notes Red,red,black,black, brown 220 ohm R18,29,31,39,72...
  • Page 7 2x 1k ohm Image Description Quantity Notes Brown,black,black,brown,brown 1k ohm R19,58 3x2,2k ohm Image Description Quantity Notes Red,red,black,brown,brown 2,2k ohm R23,65,71...
  • Page 8 12x 10k ohm Image Description Quantity Notes Brown,red,black,black,brown 10k ohm R16,17,27,28,30,32,34,35,36,37,55,63 1x 12k ohm Image Description Quantity Notes Brown,red,black,red,brown 12k ohm...
  • Page 9 2x 15k ohm Image Description Quantity Notes Brown,green,black,red,brown 15k ohm R 21,38 3x22k ohm Image Description Quantity Notes Red,red,black,red.brown 22k ohm R 20,57,67...
  • Page 10 1x 33k ohm Image Description Quantity Notes Orange,orange,black,red,brown 33k ohm 1x47k ohm Image Description Quantity Notes Yellow,purple,black,red,brown 47k ohm...
  • Page 11 1x 86,6k ohm Image Description Quantity Notes Gray,blue,blue,red brown 86,6k ohm 1x 115 k ohm Image Description Quantity Notes Brown,brown,green,orange,brown 115k ohm...
  • Page 12 1x 120 k ohm Image Description Quantity Notes Brown.red,black,orange,brown 120k ohm 1x 180k ohm Image Description Quantity Notes Brown, gray,black,orange, brown 180k ohm...
  • Page 13 1x 510 k ohm Image Description Quantity Notes Green,brown,black,orange, brown 510k ohm Now all resistors are in place.
  • Page 14 2 coils 10 uH Image Description Quantity Notes Brown,black,black,silver Coil 10 uH in this version L2,L3 ** attention , looks like a resistor , but is a coil or this version and 2x Diode 1N5819 Image Description Quantity Notes D17,D16 1N5819 polarized Step 1 –...
  • Page 15 Step two -now we solder the capacitors 1x 10 pF Image Description Quantity Notes marked with [10pF] 10 pF C20= 10 pF ceramic 3x 100 pF Image Description Quantity Notes marked with [101] 100 pF C27,29,37= 100 pF ceramic...
  • Page 16 2x 3,3nF Image Description Quantity Notes marked with [332] 3,3nF C12,17= 3,3nF ceramic 1x 10 nF Image Description Quantity Notes marked with [103] 10 nF C19= 10 nF ceramic 1x220nF Image Description Quantity Notes marked with [224] 220 nF C10= 220nF ceramic...
  • Page 17 13x 100nF Image Description Quantity Notes marked with [104] 100 nF C11,15,21,31,33,39,40,41,46,47, ceramic 48,50,51= 100nF 4x330pF Image Description Quantity Notes marked with [330] 330 pF C5,22,25,34 =330p for the filterpoles Caps for the for filterpoles...
  • Page 18 1x4,7uF polarised Image Description Quantity Notes marked with 4,7uF + - polarised it is a specially small cap 4,7 uF elko,polarized C13,30,32 =4,7uF 2x100uF polarised Image Description Quantity Notes marked with 100uF polarised it is a specially small cap 100 uF elko,polarized C38,45 Now step two is ready –...
  • Page 19 Now we come to step three- the transistors/voltage regulators 78L08 Image Description Quantity Notes IC 3 =78L08 8 Volt positiv regulator 79L08 Image Description Quantity Notes IC 9 =79L08 -8 Volt negativ regulator...
  • Page 20 4x2N3906 Image Description Quantity Notes T1,2,3,4 =2N3906 Transistor 2N3906 2x polyfuse Image Description Quantity Notes F1,2 =FUSE Fuse 200 MA *** alternative you can take a normal 3,3 ohm resistor ***Attention, solder the fuses as flat as you can in the analog board.
  • Page 21 1x pot 20k ohm Image Description Quantity Notes R11= poti 20 k ohm Poti 20 k ohm adjustment >> filter linearity Step four, now the IC sockets/connectors 4x 16 pin, 2x 14 pin , 1x 8 pin. Attention to the mark. Later it is much easier to put the IC's into the right direction...
  • Page 22 TIP, how to solder the sockets ? First solder only 2 points – like in the picture here: Take a look that the IC sockets are flat on the PCB. If not, make first one solder pin warm while press the IC socket to the PCB. Than warm up the second solder pin while press the IC socket against the PCB .
  • Page 23 Now we must solder the male headers into the PCB. We need K10 =2x6 pin K3=2x10 pin K2=2x5 pin power connector, attention this connector must be soldered from the backside.
  • Page 24 Cleaning the PCB You should clean the PCB . It looks much better – and you see better if all solderpoints in good contitions. If you use Solder with PB , you can use methylalcohol and a towel. If you use solder leadfree, simply clean the PCB with water. (*** depends of your solder flux) Can be that you must do some tests how you get the PCB clean.

  • Page 25: After Cleaning

    After cleaning I hope that I have convinced you. For me it is essential to clean my PCB's. As you see, you can control the solderpoints much better without solder fluxx than with. Your Analog board is ready and we can test the voltage on the IC- sockets – first without the IC's.

  • Page 26: Voltage Control

    On the analoge board we use four different voltages . Specially the +/- 12 Volt depends of your power supply and is not regulated on the SMR4P. Note – if your eurorack power supply had - for example 12,3 Volt –...
  • Page 27 the control board V 1.03 Step by step : first we solder all resistors and coils second all caps third the IC sockets and transistors / power regulators forth the headers and pin connectors here is the control board without parts 1x 68 ohm Image Description...
  • Page 28 4x 470 ohm Image Description Quantity Notes Yellow,purple,black,black,brown 470 ohm R 5,6,7,8 Image Description Quantity Notes Yellow,purple,black,brown,brown 4,7 k ohm R 62...
  • Page 29 2x10k ohm Image Description Quantity Notes Brown,red,black,black,brown 10k ohm R1,41 1x 22k Image Description Quantity Notes Red,red,black,red,brown 22k ohm R 12...
  • Page 30 1x 27k ohm Image Description Quantity Notes Red purple,black,red,brown 27k ohm R 64 1x 16,5k ohm Image Description Quantity Notes Brown,blue, green, red, brown 16,5k ohm R 56...
  • Page 31 1x 24,9k ohm Image Description Quantity Notes 5 ring =red, yellow, white,red,brown 6 ring=red,yellow,white,red,brown,red 24,9k ohm R 73 3x 33,2k ohm Image Description Quantity Notes Orange,orange,red,red,brown 33,2k ohm R 48,49,52...
  • Page 32 2x47k ohm Image Description Quantity Notes Yellow,purple,black,red,brown 47k ohm R 44,68 6x49,9k ohm Image Description Quantity Notes Yellow,white,white,red,brown 49,9k ohm R9,40,45,51,53,54...
  • Page 33 1x 68k ohm Image Description Quantity Notes Blue,gray,black,red,brown 68k ohm 1x82k ohm Image Description Quantity Notes gray,red,black,red,brown 82k ohm...
  • Page 34 11x100k ohm Image Description Quantity Notes Brown,black,black,orange,brown 100k ohm R3,4,15,25,26,42,43,46,47,50,69 Now we have all resistors in the control board one coil 10 uH Image Description Quantity Notes Coil 10 uH Brown,black,black,silver in this version ** attention , looks like a resistor , but is a coil or this version...
  • Page 35 second step 1x3,3nF Image Description Quantity Notes marked with [332] 3,3 nF 3,3nF ceramic 1x100pF Image Description Quantity Notes marked with [101] 100 pF C16 = 100pF ceramic...
  • Page 36 1x10pF Image Description Quantity Notes marked with [100] or 10p 10 pF C23 = 10pF ceramic 12x100nF Image Description Quantity Notes marked with [104] 100 nF C3,4,6,18,24,35,42,43,44,49,52,53 ceramic...

  • Page 37: Third Step

    1x4,7uF polarised Image Description Quantity Notes marked with 4,7uF + - polarised it is a specially small cap 4,7 uF elko third step 1x1N4148 Image Description Quantity Notes 1N4148 polarized...
  • Page 38 1x 78L05 Image Description Quantity Notes IC 10 =78L05 5Volt regulator fourth step IC sockets and the pin connectors the sockets, 3x8 ,1x16,1x28 Attention to the mark. Later it is easier to push the IC's with the right direction in the sockets .
  • Page 39 TIP>>>>IC socket 28 pol - and all others Socket 28 pin -Soder at first only 2 pins , pin 1 and 15. Is the IC socket flat on the PCB ? IF not, heat first pin 1 with the solder iron while press the IC socket with the finger against the PCB.
  • Page 40 Now it should look so Cleaning the PCB before you solder the measure connectors, you should clean the PCB . It looks much better – and you see better taht all solderpoints are good. If you use solder with PB , you can clean the PCB with methylalcohol and a towel. If you use solder leadfree, simply clean the PCB with water.
  • Page 41 No the last step - the two measure connectors on the backside K4=2x10 K8=2x6 Attention , first solder 2 pins and press the Connector against the PCB while soldering. Be sure that all the connectors are 100% correct and straight build in . Congrats –...
  • Page 42 Voltage test for the control board . We measure now the voltage on the control board. Procedure . Connect the analog board with the control board. Than measure the following points with a Multimeter . Voltages are : +12volt -12volt +8volt -8 volt 5 volt...
  • Page 43 Pannel PCB board Mount the pannel board is a special. To get the Pots straight in the middle of the holes of the Alu pannel we must work with the Pannel PCB and the frontpannel. On the right side you see a 'longhole'. So you have the posibillity to move the PCB a little to right or left on the frontpannel.
  • Page 44 the connectors K9=2x8 pin K7=2x10 pin Connect the headers at first to the control board on K5 2x 10 pin and K6 2x 8 pin . Than put the Pannel board from the top to the connectors . Be sure that the pins fit in the holes. Solder at first one pin from K7 and K9.
  • Page 45 Now separate the Frontpannel from the control board PCB. We come to the special part of the mounting We need 4 pots 4x 10k ohm pots Image Description Quantity Notes marked with CC103B 10k ohm pots CUT,RESO,FM,F-MOD And 8x Thonkiconn Image Description Quantity...
  • Page 46 First we put the pots and only 2 Jacks in the positions – without soldering Solder now only the two 3,5 Jacks. Take the frontpannel and screw it from the backside to the pannel board .
  • Page 47 Screw it from the backside. You see that the pots not soldered yet. Now put the knobs on the potis and center it so good as you can . You must also screw the jacks with its nuts on the front panel . All is in center and looks good ?? OK , than you can solder the pots .
  • Page 48 LED mounting The SMR4P-multi used flat green LED's. If you don't like the green ones – coming with the kit – you are free to use LEDS in another color . The LED output (470 ohm) can deliver round about 5 mA current .
  • Page 49 Now we take tape and glue it over the LED holes of the front panel. In the next step you put all 15 LED's into the pannel pcb. Long leg to left , short leg to right. Don't solder the LED's now !
  • Page 50 Take now the Frontpannel with the tape , and screw it together with the pannel PCB. Screw it from the backside and than take 2 nuts for two jacks on the front. Now it should be clear why we use the tape. The LED's glue on the tape and we get a nice surface. You can solder the LED's.
  • Page 51 Last chapter , mounting the IC's, mounting the PCB's and the volt pro octave adjustment. Insert the IC's in the analog board . We need the following IC's: TL074 quad opamp LM13700 TL072 dual opamp CD4053 - must be the CMOS type NOT a 74HC4053 The direction of the IC's is marked in RED Next step is the control board .
  • Page 52 Now we mount the three PCB'S together . The distance between each PCB is 11 mm. You need 2 spacer a 10 mm and two washer for each spacer. Attention , use the washer to prevent shorts near the holes on the PCB. If you source yourselfe, the Washer is for M3 screws and 0,5mm thick.
  • Page 53 Screw the analog board with ths M3 6mm Screw to the spacer. Mount the 4 Knops to the pots . And screw the jack's to the frontpannel . The mechanical assembly is finished. Now you can connect the filter to +/-12 volt power . Test at first the complete filter.
  • Page 54 Connect the voltage to the 'RES' jack. If you now increase the Voltage from 0..10 Volt the resonancy increases from 0 to maximum . Include the SMR4P-Multi is also a VCA. Direct output (VCF) is only the VCF signal. The VCA output 'VCA' and it is controlled with the GAIN input voltage.
  • Page 55 Now we come to the last step - the Filter calibration in V/Octave Information. You need a frequency counter and a multimeter. Guitar tuner is also OK. Procedure You need NO signal input set Resonancy to MAX, Filter FM to left=0 set the filtermode to 24 dB –...
  • Page 56 If you have questions or suggestions feel free to contact me on : Kontakt@TubeOhm.com The SMR4P-Multi is a combination of the SMR4-MK2 and also the Four Pole Mission filter board for Shruthi/Phoenix with enhanced measure. Special thanks to Olivier Gillet for his work on the 4PM and the SMR4MKII.