Electric Druid FilterFX Project Construction Manual Download

Page: 9 / 11

Electric Druid FilterFX Construction Guide

www.electricdruid.net

Bill of Materials

Additionally, you will need some/all of the offboard components listed on the
next page.

Order

Ref

Description

Value

Quantity

Done?

Polarity Protection Diode

1N5817

Signal Diode

1N4148

R23

1% Metal film resistor

47R

R24

1% Metal film resistor

220R

R16, R17, R18

1% Metal film resistor

470R

R14

1% Metal film resistor

560R

R1, R15

1% Metal film resistor

R25

1% Metal film resistor

2K2

R20, R21

1% Metal film resistor

4K7

R4, R6, R9, R10, R19, R22

1% Metal film resistor

10K

1% Metal film resistor

20K

R7, R13

1% Metal film resistor

100K

R11, R12

1% Metal film resistor

120K

1% Metal film resistor

680K

R2, R3

1% Metal film resistor

2M2

TL072, TL072, STOMPLFO

IC sockets

8-pin DIP

REG1

+5V Regulator

78L05

TR1, TR2

NPN Transistor

2N3904

C7, C9, C10

Ceramic capacitor

100n

Film capacitor

100n

C2, C3

Film capacitor

10n

Film capacitor

470n

C5, C8

Electrolytic capacitor

47u

Electrolytic capacitor

100u

V1, V2

VTL5C3 Optocoupler

VTL5C3

VR1, VR2, VR3, VR4

10K Lin Potentiometers

10K Lin

SW1, SW2

Salecom 3-way switch

T812

LED1, LED2

Indicator LEDs

Unmarked

Pot dust covers or plastic

IC1, IC2

Dual audio op-amp

TL072

uP1

PIC 16F18313

STOMPLFO

Page 9

Summary of Contents for FilterFX Project

Page 1: ... 4 Regulator 4 Transistors 4 Ceramic bypass capacitors 4 Film capacitors 4 Electrolytic capacitors 4 Vactrols 5 Second cup of tea and Power Test 5 Drilling the enclosure 5 Potentiometers Switches and LEDs 5 Install ICs 6 Off board wiring 7 Optional Sync Input 7 Optional Expression pedal CV input 8 Adjustments and final testing 8 Bill of Materials 9 Offboard components 10 Component choices and subs...

Page 2: ...r addition of an expression pedal to allow the filter to be used like a wah pedal but don t expect a replacement for your Clyde McCoy this is a whole different thing The expression pedal can be used as well as the LFO modulation or with Depth at zero by itself There is also a Sync input for the LFO which allows the LFO to be kept in time with an external clock from a sequencer drum machine or anot...

Page 3: ...e in the top left arm of the PCB This protects the PCB against reverse voltage so be sure to check the orientation carefully 1N4148 Diode Next do the 1N4148 diode This protects the Sync input and needs to be the right way around so again check the orientation It s the furthest left component on the PCB Resistors Next come the resistors We do them in value order from the lowest to the highest 47R r...

Page 4: ...on the PCB Don t mix it up with the similar looking transistors Transistors There are two 2N3904 transistors both along the top of the board TR1 is to the right of the right most vactrol TR2 is in the top left in the Sync Input circuit Both are marked with an n for NPN Again be sure to line up the flat side and the curved side with the markings on the PCB Ceramic bypass capacitors There are three ...

Page 5: ... since after you fit the pots it s a lot more difficult to get to some of the PCB Ok now we take a detour the reason why will be come apparent shortly Drilling the enclosure The PCB is designed to be mounted in landscape format in a Hammond 1590BB enclosure or equivalent The board is held in place by the pots and switches You can download the FilterFX drilling template from the Electric Druid webs...

Page 6: ...d their legs outwards a little to stop them falling out of the PCB while you fit it It s a good idea to tighten the pot and switch nuts down a bit to ensure they are properly located in the enclosure Once you re sure everything s in place it s a simple job to solder the con nections and you re safe in knowledge that when you next try to fit it everything will be be per fectly lined up with your en...

Page 7: ... and the sync input The two switches are a 3PDT stomp switch to provide true bypass switching and control the bypass LED to show you the on off status of the effect and a SPST momentary foot switch for the tap tempo Optional Sync Input The Sync Input is optional If you include it it allows you to synchronise the LFO to incoming puls es from a sequencer analog synth or drum machine The Sync input j...

Page 8: ...tively If you don t want the Expression CV input there are two jumpers required shown on the right They connect the pads marked R 5 and T CV Adjustments and final testing Ok it s the moment of truth Power it up and plug it in With a bit of care and attention you should now have a working FilterFX pedal It doesn t need any trimming but the knobs cover a wide range and you ll need to learn how to ad...

Page 9: ...stor 10K 6 11 R5 1 Metal film resistor 20K 1 12 R7 R13 1 Metal film resistor 100K 2 13 R11 R12 1 Metal film resistor 120K 2 14 R8 1 Metal film resistor 680K 1 15 R2 R3 1 Metal film resistor 2M2 2 16 TL072 TL072 STOMPLFO IC sockets 8 pin DIP 3 17 REG1 5V Regulator 78L05 1 18 TR1 TR2 NPN Transistor 2N3904 2 19 C7 C9 C10 Ceramic capacitor 100n 3 20 C1 Film capacitor 100n 1 21 C2 C3 Film capacitor 10n...

Page 10: ... critical and a unit built with non ideal components will likely still work fine Resistors In the interests of lowest noise we recommend you use 1 metal film resistors Changing the LED resistors Depending what LEDs you use you may find the LEDs are too bright or not bright enough for your taste The Bypass LED is powered from the 9V supply with a 1K series resistor R15 bottom left below the 2M2 The...

Page 11: ... keep the light out heatshrink or even electrical insulation tape R11 and R12 both 120K limit the dark resistance of the opto s to something reasonable and you may find with other options that you need to change their values Ideas for potential upgrades or customizations Adding CV inputs Since the Electric Druid STOMPLFO chip operates using 0 5V control voltages like many other Druid chips it is p...

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