Advertisement
Quick Links
BASED ON THE MDX
TONE CONTROL THAT
FENDER DEVELOPED
FOR CLAPTON'S STRAT.
This Hi-Fi pedal soups up the sound of any guitar and amp
combination. With just a boost and volume knob, stomping
the footswitch will boost your mids and push you right out
to the front of the mix. Take your lead tone to the next level
with this almost forgotten circuit of guitar history.
©2020 StewMac • All rights reserved • i-2352 Updated September 2020
EC EXPANDER
PEDAL KIT
INSTRUCTION GUIDE
POWER
This pedal requires a standard 9V DC center-negative
power supply (not included) and consumes only
25mA. There's no battery option.
TECHNICAL SUPPORT
If you have any questions at all, our Tech Support Team
is here to help. Email us at service@stewmac.com, and
we'll respond quickly!
stewmac.com
47nJ
47nJ
22nJ
22nJ
3n3K
.1J63
.1J63
IN GND SW OUT
Advertisement
Subscribe to Our Youtube Channel
Related Manuals for StewMac EC EXPANDER PEDAL KIT
Summary of Contents for StewMac EC EXPANDER PEDAL KIT
- Page 1 Take your lead tone to the next level is here to help. Email us at service@stewmac.com, and with this almost forgotten circuit of guitar history. we’ll respond quickly! ©2020 StewMac • All rights reserved • i-2352 Updated September 2020 stewmac.com...
- Page 2 PARTS LIST TOOLS AND SUPPLIES (REQUIRED) Guitar Tech Screwdriver and Wrench Set #3693 Fine-gauge Wire Stripper #1606 Soldering Iron #0502 Solder Wick #0504 Solder #0505 Wire Cutter #1607 Long-nose pliers #1610 TOOLS AND SUPPLIES (HELPFUL) Soldering Aids #0521 Multimeter #3607 PC Board Holder 3M Gold Fre-Cut #0500...
- Page 3 PARTS LIST Resistor values are indicated by color bands, read from left to right. The first color in the code is usually the one painted closer to a lead wire. See more about resistor color codes on page 5. 47 resistor (1) 22K resistor (2) #7351 #7379...
-
Page 4: Table Of Contents
PARTS LIST (CONT) 5mm white LED (1) 10µF capacitor (2) 1 0 u F #7422 #7338 100µF capacitor (1) 5mm LED mounting bezel (1) 1 0 0 u F #7339 #7432 A250K audio taper boost pot (1) 330pF capacitor (1) #7531 #7473 47nF capacitor (1) - Page 5 MORE HELPFUL The solder joints you’ll make on the printed circuit SOLDERING SOLDERING TIPS board are very small, and too much heat can damage AND TRICKS the board. The idea is to make joints quickly, without scorching the eyelets. • Keep your soldering tip clean by wiping it often Hold components in place for soldering by...
- Page 6 called nanofarads (nF), or trillionths of a farad, called UNDERSTANDING ELECTRONIC picofarads (pF). .001μF = 1nF = 1,000pF. COMPONENTS Resistors and capacitors may also be referred to with CAPACITORS shorthand notation on the printed circuit board The two main uses of capacitors are to store when there is a decimal in the value.
- Page 7 Audio taper is used because our ears don’t hear UNDERSTANDING ELECTRONIC changes in volume in a linear fashion as you might COMPONENTS expect. As the volume increases, a greater change in signal or sound pressure is required to perceive a POTENTIOMETERS smooth transition.
- Page 8 It’s time to install your parts! Before soldering the diode and transistors to your printed circuit board, make sure you thread the leads through the correct side. The side of the printed circuit board INSTALL THE that has white values and outlines of the components is the correct DIODE AND 4 side.
-
Page 9: 0 U F
1M resistor (1) #7367 BrownB lack BlackY ellowB rown 470K resistor (2) Resistors have a low profile, sitting closer to the board #7382 Yellow Purple BlackO range Brown than taller components, so installing these now will make installing other parts easier later on. 470K 100K resistor (1) #7365... -
Page 10: 330Pf Capacitor
The remaining capacitors below are not polarized. However, best practice is to solder these caps in place all facing the same direction when possible. INSTALL 9 CAPACITORS The remaining capacitors below are not 6.8nF capacitor (1) polarized. However, best practice is to solder #7474 these caps in place all facing the same direction. - Page 11 Orient the breakout board with the text facing You can use the pedal up, reading left to right. Slide the lugs of the enclosure as a mount for footswitch up through the bottom of the board. the footswitch while you INSTALL FOOTSWITCH solder the breakout board...
- Page 12 The last components to go onto TIME BOOST the printed circuit board are the VOLUME (A250K) (A50K) volume and boost pots. They INSTALL 2 install on the back of the board. POTS AND Each pot has three connecting ATTACH lugs. Note the orientation of FOAM TAPE each pot.
-
Page 13: Printed Circuit Board
Like some of the caps and diodes, the LED is polarized and has to be installed in a specific direction. The negative lead of the diode has a flat INSTALL edge and is shorter than the positive. INDICATOR LIGHT The LED mounting bezel consists of two main parts: A ring that the LED fits into, and a plastic plug that goes over the LED from the back side to keep it in place. -
Page 14: Mm Dc Power Jack
Insert the DC power jack into the center hole in the top of the enclosure making sure the longer of the two lugs is on the left. Use a 14mm wrench on the included nut to secure the jack into the enclosure. INSTALL THE DC Solder the inside left wire to the longer lug of the DC jack. - Page 15 Insert the output jack into the right side hole in the top of the enclosure with the tip connection facing up, as shown in the diagram. Add the washer, and thread the nut onto the shaft enough so that the jack can rotate freely. You may need to rotate the INSTALL jack to provide easier access to setting the solder joints.
- Page 16 HERE’S HOW THE CONTROLS WORK POWER: Use a standard 9 volt DC power supply with a 2.1mm negative-center barrel (not included). We always recommend pedal-specific, transformer-isolated, wall-wart power supplies or supplies with separate isolated outputs. Pedals will make extra noise if there is ripple or unclean power. Switching-type power supplies, daisy chains, and non- pedal specific power supplies do not filter dirty power as well and let through unwanted noise.
Need help?
Do you have a question about the EC EXPANDER PEDAL KIT and is the answer not in the manual?
Questions and answers