BiPhase Clone V2 Construction manual v2.B contact [email protected] .

BiPhase Clone 2 Thank you for purchasing BiPhase Clone2 pcbs. If you have any questions about building or use of the BiPhase Clone2 please contact me by email at [email protected] This electronic project not very difficult to assemble but there is a lot of parts and wire. So an accurate work is required to build the BiPhase Clone 2. There are no special or costly components inside. unless dual LDR cells may be ...It should take the average builder around to 5 to 6 hours to finish it. Please keep in mind the goal is to buid a working module, not to solder it in a minimal time... This construction manual contain, complete schematic of the board, parts and wiring draws First of all, please read the entire instructions before proceeding. When done, use the bill of materials to collect all required components. Other tools you may need to assemble the BiPhase Clone 2 are: - A soldering iron and some good solder - Diagonal cutters - Needle nose or chain nose pliers. - A digital voltmeter, to check power supply - A scope and White / Pink noise generator can be helpful for calibration procedure ...

Vintage or not vintage ? That is the question ... The BiPhase Clone2 is an open design. You can choose to wire it exactly like the vintage in a very prepatched spirit, or at the opposite , you can think the BiPhase Clone 2 as a set of many independant modules and connect jack to each I/Os. You can add attenuators pots on inputs and change audio levels to fit with most of modular synths levels too. The number of possible configurations of the BiPhase Clone 2 pcb is really wide. A Bihase Clone 2 pcb include the following set of modules - 2 x 6 stages phasors - 1 x CV-LFO - 1 x simple LFO - 1 x external CV /pedal interface - 1 x CV inverter - 1 x PSU -/+15Vdc Both phasor stages on the “Phasor pcb” are completly independant as well with the two LFOs In following pages you have many suggested basic wiring, including "vintage like" connection. So my only advise before you start to assemble the Biphase Clone2 is : Think to your needs , to what you want to build, then choose a wiring adapt it eventualy and follow it !

Part Selection Vintages Bi-Phases are builded with common parts . Few of them are selected. So here, to populate clone pcbs , you can choose same quality parts or use better components technology. This choice is important because it affect slightly the sound . I suggest 3 quality range to build the clone :

Resistors

Vintage

Modern

"Audiophile"

carbon film 5%

metalfilm5% or carbon 5%

metalfilm 2%

Polyester ceramic/styro Long life alu

Polypropylen polystyrene/styro Long life. Black Gate...

Capacitors films polyester ceramic ceramic chemical standart OPAs

RCA4558

1458,4558,TL072 LM358,LF412...

AOP2604, NE5532...

Pots

carbon

plastic/cermet

cermet

Final cost of the project also depends a lot of parts prices . It is also not true you will prefear the "audiophile" version to play music with . The BiPhase sound good with LoFi aops and it is not very noisy with or without metal film resistor. I advise you to choose good quality pots if you plan to turn them often. Note that in the bill of material few pots are LOG (also named "audio" or "B" ). The pcb fit with following pots formats : - serie P11 Sfernice * - serie S148/149/248/249 Spectrol * - Radiohm, Piher, ALPS carbon pots * pot format will fit well for 1U rack 19" assembly. If you do not plan to use the +/-15V power supply , you can forget 7815,7915, coolers, both 1000uF/40V capas and the 4N4001 diodes ( a total of 4 ). If you use this psu you need a transformer to feed the pcb with15V AC minimum and 25V max A toroid transformer is advised someting like primary : 220V or 2x110V secondary: 2x15V @15 to 30VA For a 1 U rack 19" enclosure the transformer height must remain below 36mm. Foir Jack i suggest Switchcrafts model 112A. Cheapers one will fit well too.

About LDR cells I have tried plenty LDR+ cells on the prototype. Many were not fast enough, others too big ! The final choice goes to the VTL5C3/2 made by Vactrol. It is a good cell for phasor stages . Purist will take time to match all 6 cells togheter to get the most accurate phasor ever made, but even if you don't do that your BiPhase clone2 will sound good ! Use of any other dual cell in filter stages is possible but leaved at your own risk... For the Bypass cells are VTL5C2 Vactrol, but you can choose any other single model, slow or fast ...

Technical description A) The (bi) Phasor schematic : The schematic contain 2 identical 6 stages analog phasors with feedback pot and bypass vca. It is advised to use same parts sources for both phasors. Only the fisrt channel is described, the other one is identical : Signal enter by pin J1. After a little shaping by C7/R15 and R16/C9 , the signal is buffered by U4A. R15 and R17 fix the gain of the stage to unity. The sound is directly connected to the output pin J3 via R25 and U5B and to the buffer U4B. This opa collect feedback signal subtract it to the incoming signal. The output of U5B feed the 6 stages phasor stages, composed of U1,U2,U3 and their associated parts. Each phasor stage is a simple RC filter where R is replaced by a LDR cell. Each fitler add or remove phase of signal. Adding more filters increase/decrease phase more, but also degrade slightly the signal... Nobody is perfect . 12 stage is a good acceptable value anyway ! Center frequency of filters can be changed too. Value used are the same as used in vintages But if you prefear other sound colors you can sligtly increase or decrease C1 to C6 ( 4n7 to 15nF...) The "phased" sound is present at the output of U3B , DC offset blocked by C7 and sound is send to the feedback pot P1 (and re-injected in filters chain by R21) and to the bypass buffer U5A . The bypass is a simple LDR who cut audio when it led is off and conduct when led is on. The phased sound is now added with direct signal by U5B throw R24/RV1 . and the result reach the ouptut pin J3. RV1 is the "level of phased sound " calibration trimmer. It can be replaced a fixed voltage divider if desired . The Bypass led driver implemented allow to use this stage as well as a CV switcher with logic or as a CV modulable VCA .Bypass led drivers is composed by U5, OP1,D3,D5, Q3 and their resistors . The led D3 monitors what's happen on the Bypass CV line... A quite similar led driver stage is used to control phase filters leds . Iis builded around U11, Q1 U11 is a summer stage to collect CV phase modulation sources . Gain can be adjusted by RV2. Offset ( init value) is trimmable to. Input impedance for modulators is fixed to 100K but can be freely adapted to other situations... There is also as usual coupling capacitors . Ferrite beads are optional and can be replaced by jump wires if you power the Phasors pcb with the LFO/PSU pcb or else by a 10 to 22 Ohms resistors.

B) Sweep generators ( LFOs) The LFO2 is a very classic oscillator design around U4. RV6 set the frequency . C3 (470n) define oscillation speed range. SW4 select between pulse or triangle swaveform . The result is send to the source selector (pin J3) . RV7 is an optional attenuator to trim the output level of the LFO2. The LFO2 source selector also receive Pedal ( Manual ) and LFO1 signals (on pins J4,J5). The selected source is applied on the inverter stage input (pin J6) and builded with U5B. SW5 toggle between Normal or Inverse signal. RV8 pot is the "Depth" of LFO2, the signal is available on J7. LFo1 is quite similar but feature a CV frequency control and a modulation pedal interface. The LFO 1 core is build around U3. C1set the base frequency. SW2 select the pulse/triangle waveform , followed by U5A the output buffer . RV5 is the Depth pot ,connected to J2 output of the LFO1. R26 ( as well as R36 for the LFO2) is optionnal and can be replaced f you prefear a completly "closed" modulation pot depth when set to minimum ...Bacjk to U3 , the diode bridge made by D3..D6 allow DC control of the frequency of the LFO. U2 prepear the contol voltage to drive the diode bridge. U2A sum various voltage soures : offset is set by RV3. Frequency of LFO1is set by RV2. U1 is the external pedal buffer . The pedal voltage can be applied to the LFO1 core by SW1 to control frequency of LFO1 with anb external voltage. This voltage is also buffered by U1B, send to LFO1 output directly by SW3 and to LFO2 source selector. RV1 set the offset of the pedal voltage ( fully optional now ... )

Technical description ( continue) C) The Power supply This unit is fully optionnal . You do not need to wire it if the BiPhase Clone2 is used in an already clean and well regulated +/-15V powered environment , like a modular synth cabinet. This PSU will be certainly precious if you decide to enclose your BiPhase in a rack19" case. It is a very classic power supply based on 7815/7915 regulators and well filtered. Many small diodes protect positive psu lines of LFOs operational amplifiers. Even if you do not use the integrated regulated PSU, it is widely advised to keep these diodes in place... You can also replace both ferrite beads on Phasor pcb by 10 Ohm resistors or jump wires if you use the provided PSU.

BILL OF MATERIALS Design: BIPHASE MKII AUDIO Revision: 1.1 Author: Marc Bareille Modified: 15-Mar-03 Resistors 1/4w 5% 36 R1,R2,R3,R4,R7,R8,R9,R10,R11,R12, R13,R14,R18,R19,R20,R22,R23,R24, R37,R38,R39,R40,R43,R44,R45,R46, R47,R48,R49,R50,R54,R55,R56,R58, R59,R60 12 R5,R6,R28,R29,R30,R31,R41,R42,R64, R65,R66,R67 4 R15,R17,R51,R53 390k 2 R16,R52 3.9k 2 R21,R57 6.2k 2 R25,R61 12k 2 R26,R62 560 2 R27,R63 0 (*) 12 R32,R34,R35,R73,R74,R75,R76,R77, R79,R81,R82,R84 4 R33,R68,R72,R78 220 4 R36,R69,R80,R83 10k 2 R70,R71 10

4.7k

220k

100k

Capacitors (step 5.08mm) 12 C1-6,C17,C18,C19,C20,C21,C22 6.8n (*) 2 C7,C23 470n 2 C8,C24 47n 2 C9,C25 33p ceramic/styro 2 C10,C26 100n 4 C11,C13,C27,C29 1n 2 C12,C28 3.3n 2 C14,C30 150n 2 C15,C31 470p ceramic/styro 2 C16,C32 22uF/25V Chemichal 2 C33,C34 10uF/25V chemichal 4 C35,C36,C37,C38 10n Integrated Circuits 12 U1-12

TL082,TL072,1458,4458...

Transistors 4 Q1,Q2,Q3,Q4

Low power PNP (BC560...)

Diodes 4 D1,D2,D5,D6 2 D3,D4

1N4148 Leds

Miscellaneous 1 J11 MTA156cnx 2 L1,L2 self or resistor 10 to 22 2 OP1,OP2 vactrol VTL5C2 4 P1,P2 pot 10K to 47K. LIN 2 RV1,RV4 trim 10k 4 RV2,RV3,RV5,RV6 trim 100k 6 VT1,VT2,VT3,VT4,VT5,VT6 vactrol VTL5C3-2

BILL OF MATERIALS Design: BIPHASE MKII SWEEP GEN. Revision: 1.0 Author: M.Bareille Modified: 29-Mar-04 * consider those parts only if you assemble the +/-15V PSU Resistors 1/4 --------1 R1 1M 1 R2 3k9 1 R3 22k 1 R4 4k7 10 R5,R6,R7,R16,R17, R18,R30,R33,R34,R35 39k 2% 1 R8 33k 7 R9,R13,R22,R23,R25,R28,R36 47k 3 R10,R26,R32 560 1 R11 470 3 R12,R15,R31 10k 1 R14 390k 2 R19,R20 33k 2 R21,R27 68k 1 R24 120k 1 R29 100 2 R37,R38 10 to 22 ohms 1/2W Capacitors ---------3 C1,C2,C3 470n 1 C4 2u2/25V 2 C5,C11 1000uF/40v * 2 C6,C12 47uF/25V * 6 C7,C8,C9,C10,C13,C15 100n 2 C14,C16 47uF/25V * Integrated Circuits ------------------5 U1,U2,U3,U4,U5 TL082,1458,4558 1 U6 7915 (TO220)* 1 U7 7815 (TO220)* Diodes -----8 D1,D2,D3,D4,D5,D6,D7,D8 4 D9,D10,D11,D12

1N4148 1N4001

Miscellaneous ------------3 3 1 1 4 1

RV1,RV3,RV7 RV5,RV8,RV2 RV6 RV4 SW1-4 SW5

trim 10k pot 100k Lin pot 22k to 47kLog trim 22k Switches SPDT Switches DPDT

Construction of the BiPhase Clone 2 A) Prepear boards ( ) 1- Solder Jump Wires : using resistor legs solder 10 jump wires ont the LFO/PSU pcb . ( ) 2- Solder the same 17 jump wire on the Phasor pcb , as showed on the implementation scheme. R27 and R63 are jump wires , do not forget them.. Ferrite beads on phasor board can be replaced by jump wires or 10 Ohms 1/2W resistors ( ) 3- It is time to solder IC sockets for OPA ( dip 8) on both boards, if you want to put some . I do not advise to use sockets on the phasor pcb . The density of population is rather hi. You may be a bit short in space if you use sockets and rather big caps for filter stages ... OPAs are soldered on vintages Bi-Phases and it is a much better solution if the effect mox is often moved ...

B) Solder parts on both pcbs.. ( ) 1- Identify all resistors by value and solder them in their respective location . Solder trimmers too. A tip: set all trimmer to 50% before to solder them specialy if you use 10 or 25 turns models. ( ) 2- Solder the same all 1N4148 diodes and the four 1N4001 if you use the PSU. Diodes are oriented ( ) 3- Solder now unbpolarised capacitors ( film and ceramic/styro) ( ) 4- Solder chemical/tanntalum capacitors . Take care with their direction . The + side is marked on the schematics ... They may explode or burn if you plug them reversely... ( ) 5- Solder 4 transistors on the Phasor pcb. Take care to identify E,B,C.. Special if you use an equivalent. ( ) 6- Solder all ICs ( opas) They are polarised , take care of direction. ( ) 7- Solder all Vactrol cells. They are oriented parts ( ) 8- Deflux well, clean the solder side. Ckeck for any missing/reversed part, forgotten solder join, short cuts ...

C) Finish assembly ( ) 1- If you use potentiometers for pcbs ( S148/149, P11...), solder them now. Else solder short wires to connect your pots. If distance to pot is long , use shieldied wires . Note : best performance results are obtained with pots soldered on pcb ... ( ) 2- Prepear and solder the same wires for switches , jacks and the rotative selector ( LFO pcb) Use wiring picture and different colors of wires. ( ) 3- If you use the PSU, connect the transformer Secondary to the AC inputs on the LFP/PSU board ( ) 4_ Wire the transformer primay to main power switch of the BiPhase box and power cord . Do not plug anything on maoin power now !!! Use a "fuse" and take care of what you do , a clean normalised wiring is advised on the main PSU circuits. Errors on thos patch can be dangerous . Check for schematics . If you have a doubt ask .. ( ) 5-Mount mechanicaly both pcbs in a pre-dilled box or front panel. Attach pot switches , leds and jacks to their respective locations ( ) 6- Check a last time for no remaining error or short cuts , missing wire etc...

D) First try ! ( ) 1- If you arenow sure everything is ok on both pcbs , you can plug the main plug and apply power . I am not responsible of any damage that may occur ... Take a voltmeter and check for something like 30 V or close (-/+5%) on all opas (pin 4 and 8) and +/-15 V between V+/V- and Ground. ( ) 2- Connect an audio source ( -10dB) to the input and something to monitor to the BiPhase outputs ( ) 3- Try if you heard a sound ... Try the bypass . If nothing happens turning LFO knobs or the soundd is a bit too much filtered , for the moment it is normal . Phasor CV stages need to be calibrated ... If you have a scope , you can look both LFOs waveform on the LFO/PSU pcb outputs... If everything is ok here , you can now move to the calibration procedure ! Else check for error .

Calibration of the BiPhase Clone 2 A) LFO-PSU board An oscilloscope is a great too to calibrate LFOs. Connect it at the output of the LFO2 . Set LFO2 Depth to max and select the triangle waveform . 1) There is only one trimmer for this LFO. The RV7 trimmer set finely the LFO2 output Level . Adjust it to get a +10Vpp triangle waveform. This trimmer is optional anyway and can be replaced by a simple jump wire as well... Check all other LFO 2 features ( square waveform, freq range, inverse sw) 2) Connect now the scope or at least a voltmeter on LFO1 output . Set the LFO1 Depth pot to min, Set both switches SW1 and SW3 to get a frequency control of the LFO1 by the pot RV2 ( not the pedal... upper position of switches on schematic) . The trimmer RV3 set the slowest speed of the LFO1 . Set it to minimum ( slowest ) , than increase sligthly until the LFO1 start to oscillate very slowly. 3) The RV4 pot help to finely adjust the output level of the LFO1. Tune it to get a 10Vpp triangle waveform 4) The RV1 trimmer adjust the initial offset for the pedal input . Connect a pedal on the pedal CV input ( a simple 22K to 47K pot connected between +15V (3) and ground (1), the taper (2) is the pedal CV ...) Adjust the offset to obtain a good range of 10Vpp with the pedal... Check also the CV control of the LFO1 by the pedal ( SW1 on low position) . This allow to obtain a very slow control frequency with a very accurate control when RV1 is correctly set. If you do not use the pedal CV input feature, you can widely simplify the board and remove/forget concerned parts ,switches on LFO 1 and the LFO2 wave selector too...

B) Phasor board 1) Connect a source signal on the Phasor input . The best is to use a Pink or White Noise generator . Connect the output to your monitor system.Set Feedback pot on max ( turn it full rigth ) The Bypass led must be ligth ON... Connect a modulation source ? One of the two LFO can be good 2) Set the trimmer RV1 ( RV4) to min ( minimum resistance on the wire...) You will increase it later if you find there is to much FX sound . This trimmer attenuate the sound coming from phase filters stages. 3) RV2 set the offset added to the incoming CV . RV3 the gain to amplify the incoming signal. Set RV3 to minimum . And turn slowly RV2 until you ear the phase modulation on the audio signal. Then adjust the RV3 trimmer to obtain a larger range of effect . Re-center with RV2...Repeat until you reach a position where the CV modulate the sound in the larger range without "cliping" the modulation waveform... It can be interesting to use a manual variable CV source too to validate offset and range ( gain) settings 4) Repeat this procedure on the other phasor stage, with the same modulation. 5) Compare both phasor in stereo . Use Headphones to ear the difference and play with a manual CV Adjust again with RV2 RV3 and RV5, RV6 to get both phasor sounding as identical as possible for a same incoming modulation CV.

Calibration procedure (continue) B) Phasor board 1) Connect a source signal on the Phasor input . The best is to use a Pink or White Noise generator . Connect the output to your monitor system.Set Feedback pot on max ( turn it full rigth ) The Bypass led must be ligth ON... Connect a modulation source ? ONE OF THE 2 LFO can be good 2) Set the trimmer RV1 ( RV4) to min ( minimum resistance on the wire...) You will increase it later if you find there is to much FX sound . This trimmer attenuate the sound coming from phase filters stages. 3) RV2 set the offset added to the incoming CV . RV3 the gain to amplify the incoming signal. Set RV3 to minimum . And turn slowly RV2 until you ear the phase modulation on the audio signal. Then adjust the RV3 trimmer to obtain a larger range of effect . Re-center with RV2...Repeat until you reach a position where the CV modulate the sound in the larger range without "cliping" the modulation waveform... It can be interesting to use a manual variable CV source too to validate offset and range ( gain) settings 4) Repeat this procedure on the other phasor stage, with the same modulations. 5) Compare both phasor in stereo . Use Headphones to ear the difference and play with a manual CV Adjust again with RV2 RV3 and RV5, RV6 to get both phasor sounding as identical as possible for a same incoming modulation CV.