Random*Source JHAIBLE Dual WASP Filter User manual

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RANDOMSOURCE.NET 1
J. HAIBLE Dual WASP Filter (Euro)
JHAIBLE DUAL WASP VCF (Euro)
Jürgen Haible’s WASP Filter adaption of the famous CMOS VCF introduced some unique features, in particular
a distortion stage. The R*S version takes this a step further by turning it into a dual version with a dynamic link
that allows to combine the lters in series or parallel or anything in between - even voltage controlled. Also, each
side can blend from lowpass to highpass or bandpass (yes, the notch is in there, too!) creating innite lterbank
combinations. A Sync switch has been added to be able to control both side’s cutoff frequency with from the left
side. The unique distortion can be congured to PRE or POST for each side.
The R*S kit is the only authorised adaption of the Haible WASP VCF for Eurorack.
Features
• 2IdenticalHaibleWASPltersincludingdistortion.
• BlendfromLowpasstoHighpassorBandpass. 
• DistortioncanbeconguredtobePREorPOST.
• MODEblendsfromserialtoparallelsetup-evenCVcontrolled.
• SYNC:controlCutoffofbothltersatthesametime.
• Inniteoptionsfrom4-poleVCFtoStereolter.
• MassivedronemachineComplexoscillatorwhenpatchedtoself-oscillate.
• Nowiringneeded.

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J. HAIBLE Dual WASP Filter (Euro)
Filtersections
• Audioinputwithlevelpot
• CVinputsforCutoffwithattenuators
• Resonanceknob
• Typeknob:blend output between LOWPASS and HIGHPASSorLOWPASS and BAND-
PASS(setTypedestinationwiththeType-Switch)
• Distortionknob(DistortioncanbeconguredtoPRElterorPOSTlterusingjumpers)
Controlsection(Center)
• SYNCswitch:whenactivated,CutoffandCVfromtheleftsidecontroltherightside,too.Thisopensup
amazingpossibilites:usebothsidesseparately(turnMODEtoparallel)asastereolterorsetMODEto
serialfora4-pole(24db)WASPlter.
• MODEknob:blendfromSERIALtoPARALLEL.
• MODECVinput:MODEcanbevoltagecontrolled(!)
• MODECVknob:attenuvertertocontrolhowtheCVaffectstheMODE
• CENTEROUTPUT:mixoutputsendingoutthecombinationofthelters(anddistortion)dependingon
MODEsetting
DISTORTION (PRE)*
FILTER A
DISTORTION (POST)*
SERIAL / PARALLEL
MODE
BLEND VIA KNOB / CV
INPUT A
OUT A
OUT M
OUT B
DISTORTION (PRE)*
FILTER B
DISTORTION (POST)*
INPUT B
*DISTORTION TO BE SET TO PRE OR POST FOR EACH SIDE VIA JUMPER
DUAL HAIBLE WASP SIGNAL FLOW

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RANDOMSOURCE.NET 3
J. HAIBLE Dual WASP Filter (Euro)
The R*S kit consists of a main pcb and a matching panel pcb which serves as an interface to the front panel.
Bot pcbs version 1.00 are through-hole (TH) with only very few optional SMT parts (BCM857 on the main pcb
and dual op-amp on the panel pcb):
Pleasenote:
• Youhavetodecideforeachlterifthedistortionshouldbebeforethelter(PRE)orafter(POST)by
setting3 jumpersforeachsideonthemainpcb:allthreeintheUPposition=PRE,allthreeDOWN=
POST:
(Do not try anything in between!)
• If you don’t use a BCM857, pay attention to the direction of the transistors Q1 and Q2
(emittersaremarked“E”onthepcb)-incorrectorientationcandamagethebottomLM13700(IC5,
closetothepowerconnector).Ifyouaccidentallyusedanincorrecttrasistor(pair),youprobablyhave
toreplacetheLM13700forthemiddlesectiontoworkafteryouxedthetransistors.

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J. HAIBLE Dual WASP Filter (Euro)
• Thereare2pairsof(optional)trimmerstooptimizetheMODEperformance:
“TRIM X”and“TRIM Y”controlCVRejection.Thesecanbecalibratedbyear(orscope).Seedetails
below.
“BIAS”trimmerscanbeusedtoeliminateoutputoffset,forthisyouneedagoodscope(agoodDMM
mightwork,too).Thisisreallyfortheperfectionists-seecalibrationinfobelow-,soifyoudon’thavea
scope,it’sprobablybestnottobother:installRGX,RGYandalinkfrompin1to2(center)or3.
• Becareful:2oftheop-amps(leftandright)areSINGLE!TheonesinthecenterrowareDUAL.
Do not confuse SINGLE and DUAL op-amps up or they will burn!
• There’sadualop-amp(inSMT)onthepanelpcb:withoutthis,turningtheCVattenuator(withoutCV
goingin)willaffecttheCutofffrequency.Installtheop-amptoavoidthis(butomittheresistorsmarked
RLX!)
• Recommenden:useOPA2134(insteadofTL072)foralldualop-ampsand
OPA134forthesingleones.
• TheDualWASPhastobepoweredbya+/-12V stabilized PSUonly.
• Random*SourcehasaquiredallrightstoJürgenHaible’selectronicheritageandistheonlylegitimate
sourceforJürgenHaible’sdesigns.

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RANDOMSOURCE.NET 5
J. HAIBLE Dual WASP Filter (Euro)
BillofMaterials
Trimmers
2100k CV_REJECT1,CV_REJECT2 Trimpots(Bourns3362PorVishayT73YP...)oranything
thatts-Singeturnshoulddo
Optional-trimmerstoadjustCVrejectionfortheMODE
circuitry,RTXandRTYareneededifinstallingtrimmers!
2100k BIAS1,BIAS2 Trimpots(Bourns3362PorVishayT73YP...)
Optional-usetrimmerandlowerRGX,RGYor
uselinkandkeepRGX,RGY-seetext!
Resistors (1%)
2BEAD F1,F2 FerritBead
2RLX R12,R13 Install links / 0R (only) if NOT using IC10!
2220R R57,R62
11 1k R25,AR1,AR2,R5,R9,R25B,
R26A,R26B,R32,R36,R77
21k* AR3,AR4 TaperforCutoffPot
21k5 R24B,R24
7 4k7 R19,R20,R46,R47,R59,R64,
R69
25k1* R27,R27B setsCVrange
7 10k R75,AD7,AD14,R72,R73,
R74,R76
120k R70
19 33k R2,R23,R29,R71,R1,R4,R6,
R8,R10,R11,R18,R28,R31,
R33,R35,R37,R38,R45,R50
239k* RDA,RDB setslevelofdistortedsignal
4 47k RBX,RBY,RCP1,RCP2
651k R3,R7,R16,R30,R34,R43
20 100k AD1,AD2,AD3,AD5,AD6,
AD8,AD9,AD10,AD12,AD13,
R17,R21,R22,R44,R48,R49,
R58,R63,R67,R68
2390k/470k RGX,RGY BIAS-use390k+100kBIAStrimmeror
470kandlinktrimmer
2470k R66,R78
41M R15,R42,RTX,RTY RTX,RTY:Optional-neededforCVrejectiontrimmers
Capacitors (5mm lead spacing except for Styroex)
268p C4,C13 C0G/NPO
4 1n C7,C8,C16,C17 C0G/NPO

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J. HAIBLE Dual WASP Filter (Euro)
4 1n C2,C3,C11,C12 Styroex(orC0G/NPO)
19 100n C5,C6,C14,C15,CP3,CP4,
CP5,CP6,CP7,CP8,CP9,
CP10,CP11,CP12,CP13,
CP14,CP15,CP16,CP17
BypassCaps-Filmrecommended,X7RisOK
210nor100n C27,C28 Bypasscapsonpanelpcb-SMTorTH
5 220n C1,C9,C10,C18,C19 Film5%(e.g.WIMA)orC0G
210uF CP1,CP2 Electrolytic
8 10uFNP C20,C21,C22,C23,C24,C25,
C26,CSMOOTH
NichiconMuseNPMouser:647-UES1V100MEM
NON-POLAR/BIPOLAR!
ICs
2OPA134P IC8,IC9 Burr-BrownSINGLEOp-Amp(orOPA227)
2TL072 IC6,IC7 orOPA2134(DUAL)
2CD4069U IC3,IC4 CMOS
3LM13700 IC1,IC2,IC5
6 1N4148 D1,D2,D3,D4,D5,D6
21N4001 D7,D8 Protectionagainstinsertingpowerribbonthewrongway
1DUAL* IC10 ***SMTDualOp-amp,egOPA2134,TL072(SOIC8)
2BC560 Q1,Q2 PNPTransistorBC560C-AlternativetoBCM857!!
Donotinstallboth!
1BCM857DS Q1A NXPBCM857(SMT)insteadofQ1,Q2
Potentiometers (Alpha 9mm vertical pcb mount) availablefromThonk,Tayda
4 B10K CUTOFF1,CUTOFF2,
DIST1,DIST2
LinearPotentiometer
9 B50KorB100K INPUTATTENUATORS,CV
ATTENUATORS,RESONANCE,
TYPE,MODE
LinearPotentiometer
1B50K PMODE-CV B100Kshouldworkhere,too,butwillslightlychangethe
potsensitivityaroundthecenter
Misc
6 Knobs matchingpots,e.g.DaviesfromThonk
3SwitchSPDT
2-Positions
(ON-ON) Sub-MiniatureSwitch,e.g.MountainSwitch
(Mouser:108-0042-EVX)
8 ThonkiconnJacks 3.5mmJackSockets(PJ301M-12)fromThonk
1EuroPowerheader MTA-100powerconnector,Reichelt:WSL10G
 SILheaders
2x10pin
1x12pin
1x15pin(10+5)
pinconnectors,linkingmainpcbtocomponentpcb-
usingprecisionstripsallowstobreakoffpiecesas
needed.

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RANDOMSOURCE.NET 7
J. HAIBLE Dual WASP Filter (Euro)
PowerConnector
The module is designed to be powered using a standard Eurorack 10-pin DIP header (pinout +12V / GND /
GND / GND / -12V with the red stripe on the cable indicating the -12V side).
Builingchoices
Trimmers: Trimming concerns only the MODE (mix) circuitry and does not seem essential. CV rejection (TRIM X
and TRIM Y) can easily done by ear (see calibration info below), while the BIAS trimming requires a good scope,
so installing the BIAS trimmers makes no sense unless you’re sure that you want to do the calibration (which is
easy with a scope).
Op-amps: the OPA2134 and OPA134 are hard to beat in performance, however, feel free to experiment with
other choices, just make sure you don’t mix up single and dual.
Building
1. Use a side-cutter to separate main pcb and component pcb.
2. Main pcb and component pcb are to be connected through precision SIP sockets and pins (pin
headers). It is recommended to use the pins on the main pcb (facing down, soldered from above)
and the pin sockets on the component pcb (standing up, soldered from the front panel side).
Break or cut off the pieces you need and stick them together.
3. Attach screws / spacers (10mm or hight matching the pin headers to connect ) to the panel pcb
(this gets more difcult once the component pcb is connected to the front panel) and insert the
pin headers connecting the pcbs. Main pcb and panel pcb should form a nice sandwich (don‘t sol-
der yet). Check that you didn‘t leave out any pins / holes and that the sockets are all on the same
side (component pcb). Solder all the pins in while keeping the sandwich together - this avoids any
misalignments.
4. Carefully separate the sandwich - if you used precision sockets, this may not to too easy - they
stick together nicely (giving a good connection).
5. Mount the Thonkiconn jacks, the pots and the switches onto the panel pcb. Pots should sit on the
side facing the front panel (as marked on the board). Don‘t solder them in yet.
6. Either solder the SMT op-amp (OPA2134 or TL072 in SOIC8) onto the panel pcb or install links /
zero ohm (0R) resistors in the spots marked RLX - not both!
7. Insert and solder the BP (Audio) Caps (C10, C11) and the LED trimmers (or resistors - not both!)
onto the panel pcb. The BP caps should lie (at) between the Thonkiconn jacks.
8. Carefully mount the panel pcb (with the pots etc. inserted) onto the front panel. You may then
have to wiggle each pot a bit to get the pots through. Make sure the threads of the pots go
through completely and the pots sit right at the front panel. Screw the jacks, pots and switches to
the the front panel to make sure of that.

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9. Once everything is nicely in place, solder the pots, jacks und switch onto the component pcb
(while the front panel is attached).
10. Build the main board with all through-hole-parts required, beginning with the resistors, caps etc.
11. Connect a power cord supplying +12V, GND, GND, -12V to the power-header on the main board
and double check the direction of the power header before you turn power on. You should be
ready to go now :-)
Calibration
CV Rejection: If you installed TRIM X and TRIM Y, simply feed a audio signal - ideally a pulse wave around
1kHz or so - into the CV Mode input, set the MODE knob to CCW (minimum) and turn the CV Mode knob all the
way up (make sure there is no other input anywhere). Listen to the MODE center output and adjust TRIM X, then
TRIM Y so that you get no (or hardly any) output - of course you can use a scope, too. (Don’t expect it to get
absolutely at / quiet, especially with a pulse wave.)
BIAS: If you’ve installed the two BIAS trimmers, you need no input at all. Use the scope to check the voltage
a the test pad marked TP next to TRIM X. Ideally it should be at 0 mV. Use BIAS X to set it accordingly. Then
repeat with test pad TP2 below the BIAS Y trimmer and you’re done.

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SomeTroubleshootingTips
• Firstmakesurebothsidesworkcorrectly,i.e.ignorethemiddlesectioncompletely,feedasignalinto
eachsideandlistentoOUTA/OUTB. If only one side does not work: compare both sides, they are iden-
tical, so a build issue is likely on the side not working. If both sides do not work, it seems to be a system-
atic problem, check power, values, op-amp orientations etc.
• OnlydealwiththemiddlesectionifbothsidesareOK!Some quick tests for the middle:
*Check that you used a BCM857 (not BCM847!)? Or, if you used single transistors for
Q1 and Q2, that you used the right ones / inserted them correctly? Note the “E” marking
(emitter) on the pcb.
*Feed an audio signal into INPUT A (only), set both lters to LOWPASS and open lter A
and B (CUTOFF) and listen to OUT (middle). Any signal present? Turn the mode knob (try
both ends) - does the signal change? Play with CUTOFF A, does that affect the output /
do you hear a ltered sound?
*No sound in the middle? Keep feeding a signal into A, CUTOFF open and check with a
scope using the test pads: “(x) TP IN (y)” - on (y) you see the signal going into the VCA,
on (x) the output of the rst VCA. If you have a signal on IN (y) but not on (x), swap the lower
LM13700 (near the power connector).
*Test pad 2 (“TP2”) can be used to check the signal coming out of the second VCA (= second half
of the LM13700). However, if you have no signal on test pad (x), there cannot be any on TP2, so x
and y are usually more relevant for spotting any problem with the LM13700.
• Youcanalsomeasurethevoltagesonpins1and16ofthelowerLM13700whileslowlyturningthe
modeknob- these are the VCA control pins. When turning the mode knob you should see it
moving somewhere near the negative rail, approx. just between -10,5V and -11V (but it should
move). If these pins don’t move (but sit on the negative rail):
*When you move the MODE knob, the voltage at the 3rd pin from the bottom of the long
(top) pin row on the right of the main pcb (connecting the panel pcb and the main pcb) -
next to the „L“ of the JHAIBLE logo - should change. if it does not, there could be an issue
with the pot or the connection.
*If all of that looks OK, the OTA (LM13700 near the power connector) could be dead.
PowerConsumption
Power consumption: up to 130mA @ +12V and ca. 40mA @ -12V
Module width: 22HP, depth: < 35 mm
(Version 2. July 2017, 4:20 PM)