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flanger-build-docs

Build docs for Imogen Wren Studios (Formally PGFX) BBD Dual Mode Analog Flanger

PCB Layout

image

Build Notes: Please read entire document before commencing build!

We Recommend starting with the smallest components first, the resistors and diodes, before moving onto sockets for the ICs, caps and transistors. Check the polarity of diodes and Electrolytic caps!


NOTES REGARDING BBD CHIP SELECTION

This PCB has been designed to work with MN3207/8 BBDs and MN3102 Clocks. You can mix and match between MN3207s and MN3208 chips if desired. MN3208 has a slightly longer delay time so using this in parallel with the MN3207 can create a deeper warble.


Before breaking apart the Footswitch Daughterboards, we find it easiest to connect the In, +, - and Out with short runs of multi strand cable between the Main Board and the Bypass boards.

This board is a neat true bypass solution, but can be omitted, just follow the labelling on the main board if you wish to implement your own bypass circuit.

The other footswitch daughterboard switches in the 2nd BBD delay line to effectively double the intensity of the flanging effect. All the connections on this board need to be connected with the pin’s opposite on the main board. It is easiest to do this before breaking them apart. The daughterboard can be replaced with a SPST toggle switch if a second footswitch is undesired. The switch should connect and break the Lsnd and Lrtn on the main board

The Trim pot on the Daughterboards are for LED Brightness. We tend to use between 50-100k but you can omit it entirely, just short either of the 2 pins that are already connected together to the 3rd pin.

Once the top side of the board is populated, the Pots can be placed as well as the bypass footswitch, we recommend soldering a single pin of each, aligning the PCB in the enclosure and then soldering the rest of the pins. This ensures the PCB is fitted neatly and there is no undue stress on any of the connections. Before the PCB is mounted in the box, we also find it easiest to solder some long flying leads for the Jacks and DC Connections to the Bypass Daughterboard.

The Ji – Jack in, and Jo – Jack out pins, as well as the Ground wires for the jacks, and the Vin and GND to the DC Jack should be soldered with multi stranded wire 10-15cm long that can be cut to length once installed.

The final components to solder to the board are the indication LEDs, our best practice is to solder the short negative pin first, almost flush with the PCB, and leave the other pin unsoldered until it is lined up with the hole in the enclosure. We use a 5mm LED bezel, but you can just drill the correct sized hole in the enclosure and mount it direct.

Install the board, attach all the hardware and then make sure the LED is sat correctly before soldering the final pin.

Now the offboard wiring can be completed to the In and Out jacks, and the DC Jack.

Calibration - DO NOT SKIP THIS STEP!

Once assembled you will need to set the trim pot for the correct operation.
Adjust the 100k TrimPot on the main board until the flanging effect is at its maximum, if you are hearing distortion on the wet signal it is likely that this TrimPot needs adjustment.

Mods

Some potential for mods are documented on the schematic below. A higher res PDF is available in this repo.

Notes on Boxing & Drilling

This PCB is designed for Tall 4S1590BBT / 1590BBT or 1590C Enclosures. You may struggle to find room for the jacks in a smaller enclosure.

No Drill template has been provided, but the PCB itself provides centre holes to line up drill marks. In the case of the alpha pots, the 2 large mounting Pads and the pin 2 Pad can be used to align the drill marks. It is easiest to do this before soldering the board.

Schematic

Please see - flanger-schematic for high res PDF image

BOM

BOM: Value Type Notes
--- --- --- ---
Resistors
R1 1k Resistor
R2 10k Resistor
R3 10k Resistor
R4 10k Resistor
R5 4k7 Resistor
R6 10k Resistor
R7 22k Resistor
R8 1k Resistor
R9 56k Resistor
R10 330k Resistor
R11 10k Resistor
R12 470k Resistor
R13 470k Resistor
R14 100k Resistor
R15 10k Resistor
R16 10k Resistor
R17 10k Resistor
R18 10k Resistor
R19 100k Resistor
R20 22k Resistor
R21 10k Resistor
R22 56k Resistor
R23 330k Resistor
R24 220k Resistor
R25 2k2-4k7 For High Brightness LED CLR Resistor
R26 100k Resistor
R27 330k Resistor
R28 33k Resistor
R29 470k Resistor
R30 1k Resistor
R31 2k2 Resistor
R32 4k7 Resistor
R33 1k Resistor
R34 4k7 Resistor
R35 4k7 Resistor
R36 100k Resistor
R37 100k Resistor
R38 10k Resistor
R39 220k Resistor
R40 10k Resistor
R41 33k Resistor
R42 150k Resistor
R43 68k Resistor
R44 470k Resistor
R45 4k7 Resistor
R46 10k Resistor
R47 10k Resistor
R48 2k2-4k7 For High Brightness LED CLR Resistor
R49 22r Resistor
R50 10k Resistor
R51 10k Resistor
Rdry1 33k Resistor Dry Signal Level
Rfb1 1k Resistor Feedback Signal Level
Rl1 27k Resistor Output Level
--- --- --- ---
Caps
C1 100n FilmCapacitor Wima
C2 100n FilmCapacitor Wima
C3 10n FilmCapacitor
C4 470p FilmCapacitor
C5 Builders Choice. FilmCapacitor Creates Lowpass filter in the feedback line
C6 33n FilmCapacitor
C7 100n FilmCapacitor Wima
C8 33n FilmCapacitor
C9 100p FilmCapacitor
C10 1n FilmCapacitor
C11 4n7 FilmCapacitor
C12 3n3 FilmCapacitor
C13 3n3 FilmCapacitor
C14 33n FilmCapacitor
C15 100n FilmCapacitor Wima
C16 2n2 FilmCapacitor
C17 1u FilmCapacitor
C18 10n FilmCapacitor
C19 4p7 FilmCapacitor
C20 47p FilmCapacitor
--- --- --- ---
Electrolytic Caps
EC1 1u ElectrolyticCapacitor
EC2 10u ElectrolyticCapacitor
EC3 1u ElectrolyticCapacitor
EC4 22u ElectrolyticCapacitor
EC5 22u ElectrolyticCapacitor
EC6 10u ElectrolyticCapacitor
EC7 10u ElectrolyticCapacitor
EC8 10u ElectrolyticCapacitor
EC9 10u ElectrolyticCapacitor
EC10 10u ElectrolyticCapacitor
EC11 220u ElectrolyticCapacitor
EC12 100u ElectrolyticCapacitor
--- --- --- ---
Transistors
Q1 2N5087 transistors Small Signal PNP
Q2 2N5088 transistors Small Signal NPN
Q3 2N5088 transistors Small Signal NPN
Q4 2N5088 transistors Small Signal NPN
--- --- --- ---
ICs
IC1 4558 integrated_circuits Dual Opamp
IC2 MN3207_BBD integrated_circuits BBD
IC3 MN3207/8_BBD integrated_circuits BBD
IC4 4558 integrated_circuits Dual Opamp
IC5 MN3102_CLK integrated_circuits BBD Clock
IC6 TL022 integrated_circuits Low Power Opamp
--- --- --- ---
Regulators
REG1 L7805 regulators +5v Regulator
Potentiometers
Depth4 B50k Potentiometer 16mm Right Angle PCB Mount
Manual3 B50k Potentiometer 16mm Right Angle PCB Mount
Rate5 C500k Potentiometer 16mm Right Angle PCB Mount
Regen2 B50k Potentiometer 16mm Right Angle PCB Mount
Trim1 100k TrimPot BBD Bias Voltage
Trim2 LED TrimPot LED Brightness 50-100k
Trim3 LED TrimPot LED Brightness 50-100k
--- --- --- ---
Diodes
D1 LEDA diodes Diodes:3MM_B
D2 1n4148 diodes Diodes:DO35-3
D3 1n4148 diodes Diodes:DO35-3
D4 LEDA diodes Diodes:3MM_B
D5 1n4148 diodes Diodes:DO35-3
D6 1n4007 diodes Diodes:DO41-3
--- --- --- ---
Switches
SW1 3PDT Footswitch Switches:3PDT
SW2 3PDT Footswitch Switches:3PDT

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