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StewMac LIGHTCYCLE PHASOR II Instruction Manual

Bilphase shift using photoresistors
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Summary of Contents for StewMac LIGHTCYCLE PHASOR II

  • Page 2 Even if you’re a complete beginner don’t worry! We go over everything from unboxing, to choosing the right soldering iron, to making every connection. We also give tips on painting your pedal. Visit: stewmac.com/pedal-build...

  • Page 3: Tools And Supplies

    Not pictured: #1Phillips screwdriver, TOOLS AND SUPPLIES supplies to paint your pedal, clear (REQUIRED OR RECOMMENDED) silicone adhesive, spray finish. Soldering Iron #0502 Solder Wick #0504 PC Board Holder #0500 Power: Model 12253 requires a Solder #0505 standard 9V DC center-negative power supply (not included) and consumes less than 100mA.
  • Page 4 TOOLS AND SUPPLIES (HELPFUL) Magnifying glass or OptiVISOR #1685 Multimeter PM16B #3607 Our Pedal Building Tool Set #2318 is the perfect companion for new pedal builders who do not already have a lot of tools and supplies. Soldering Aids #0521...

  • Page 5: Parts List

    We know you are excited to get started building. PARTS LIST Note: While electrical That said, one of the keys to a successful build, is properties remain the same, taking the time to get to know all of your parts. Sort all of your pedal’s the appearance of parts may vary parts and check off according to the parts lists that follow.

  • Page 6: Parts List (Cont)

    PARTS LIST (CONT) 1µF capacitor (1) 47K resistor (2) 1u F #7369 #7314 Yellow Purple Black Brown 10µF capacitor (3) 1 0 u F 68K resistor (3) #7380 #7310 Blue Gray Black Brown 220K resistor (7) 220µF capacitor (1) #7381 2 2 0 u F Black Orange Brown #101930...
  • Page 7 PARTS LIST (CONT) 820pF capacitor (1) 47K resistor (2) #7369 3.3nF capacitor (1) 2N4401 transistor (1) #100722 Brown Purple Black Brown #7303 #100735 3.3nF capacitor (1) 2N4401 transistor (1) #7303 #100735 47pF capacitor (1) 68K resistor (3) #7380 #100720 Blue Gray Black Brown...
  • Page 8 PARTS LIST (CONT) TC1044 B10K linear taper pot (1) TC1044 SCPA Charge pump (1) #7532 #100732 TL072 A10K audio taper pot (1) TL072 1C op-amp (6) #101646 #7444 A25K audio taper pot (1) Integrated circuit socket (7) #102230 #7484 Adhesive foam tape squares (4) Yellow LED (1) #7560 #7423...
  • Page 9 PARTS LIST (CONT) 24" of lead wire (1) #5960 Pre-drilled enclosure (1) StickerSheet (1) Circuit Board [PCB] (1) IN GND SW OUT Breakout Board (1) Control knobs (3) #7501...
  • Page 10 (or custom decals that you can create on your own). Doing this pre-build is not only fun, but it’s much easier than disassembling the pedal to paint it once you put it together. Don’t PAINTING forget to order quality primer and lacquers from stewmac.com. YOUR PEDAL HOUSING 5.
  • Page 11 UNDERSTANDING ELECTRONIC Band 1 Band 2 Band 3 Multiplier Tolerance COMPONENTS BLACK BROWN +/- 1% A number of different components are used to make an +/- 2% ORANGE 1,000 effects pedal. Here’s an overview of what they do.. YELLOW 10,000 GREEN 100,000 +/- 0.5%...
  • Page 12 CAPACITORS The two main uses of capacitors are to store electricity Resistors and capacitors may also be referred to and to block the flow of DC current. with shorthand notation on the printed circuit board when there is a decimal in the value. For Capacitor values are typically printed on the example, the place on the board for the 4.7K component.
  • Page 13 TRANSISTOR DIODES Transistors are used Diodes are used where you want electricity to flow in to amplify electrical only one direction, such as power rectification, and PT239 signals. They have also to limit how much current can flow, to create echo a a square tab on “clipping”...
  • Page 14 Audio taper is used because our ears don’t hear POTENTIOMETER changes in volume in a linear fashion as you might A potentiometer, or pot, is a variable expect. As the volume increases, a greater change resistor. This means as the knob shaft in signal or sound-pressure is required to perceive a is rotated, the DC resistance smooth transition.
  • Page 15 SOLDERING The solder joints you’ll make on the circuit boards Here’s a few more are very small, and too much heat can damage the soldering tips that board. The idea is to make joints quickly, without scorching the holes. might be helpful: •...
  • Page 16 Insert the diode leads through the component side (the side with the component’s info silkscreened in white). In many cases, components must be inserted in a specific direction due to polarity, so follow the graphics carefully. For example, diodes are polarized, so they must INSTALL be installed in the correct orientation.
  • Page 17 Next, we’re going to add some resisitors to our PCB. Like in the previous step, you’ll find an outline of each resistor and its value printed in the proper location on the PCB. Resistors are not polarized, so it doesn’t matter which lead goes in which hole. Match resistors to the INSTALL 46 values on the PCB, a few at a time, and solder in place.
  • Page 18 120 resistor (1) #101122 Brown Black Black Brown INSTALL 46 RESISTORS 330 resistor (1) #7375 Orange Orange Black Black Brown 560 resistor (2) #7356 Green Blue Black Black Brown 8.2K resistor (3) #100702 Gray Black Brown Brown 10K resistor (3) #7362 Brown Black Black...
  • Page 19 When installing resistors vertically, use care to install them in an orderly fashion in rows for a nice and consistent look. INSTALL 46 RESISTORS 2.2K resistor (2) #7376 Black Brown Brown 3.9K resistor (2) #100700 Orange White Black Brown Brown 47K resistor (2) #7369 Yellow Purple Black...
  • Page 20 The internal trim pots featured on the Lightcycle allow the user to fine tune the overall “feel” the pedal will have when engaged. The trim pot on the left adjusts the sweep, or general feel of the effect when it is engaged. The trim pot on the right adjusts the the strength of the INSTALL 2 effected signal.

  • Page 21: Charge Pump

    Next, carefully snap seven integrated circuit (IC) sockets onto the PCB. Make sure the u-shaped cutout matches the one on the PCB and that ALL of the legs have penetrated the PCB and “U” cutout INSTALL 6 none have folded under the part. Flip over the PCB and solder OP-AMPS &...
  • Page 22 The three types of capacitors shown below are polarized and have to be installed in the correct orientation. Note the stripe running the length of each cap; this identifies the negative (minus) lead. On the circuit board, the circle for this cap’s location has a round INSTALL 5 through hole on one side, and a square through hole on the other, this is where the “+”...
  • Page 23 The remaining capacitors below are not polarized. However, best practice is to solder them in place with W I M A text facing the bottom of the PCB. 0 , 0 1 INSTALL 14 1 0 0 - CAPACITORS 1nF capacitor (1) 470nK #101931 100nF capacitor (2)
  • Page 24 INSTALL 14 CAPACITORS 820pF capacitor (1) #100722 47pF capacitor (1) #100720 6.8nF capacitor (6) #100723 682J100 682J100 682J100 682J100 682J100 682J100...
  • Page 25 The next step is installing the yellow LED. This LED will interact with six surrounding light detecting resistors (LDRs). On the Lightcycle, the LDRs are used to control the gain of several IC OP-AMP stages. As the internal LED gets brighter, the gain of each stage increases. The INSTALL principle is similar to a potentiometer.
  • Page 26 LDRs need the light of the LED to function, so it’s critical that the surface of the light detecting sensor on the LDR is exposed clearly to the LED. The leads will need to be bent at a right angle so that the LDR faces the LED.
  • Page 27 PCB and solder them on the back. 3n3K .1J63 682J100 .1J63 682J100 StewMac’s PCB Holder (#0500) is perfect for soldering tiny parts and wires. With two free hands and the ability to rotate the board, you’ll easily find the perfect angle to work.
  • Page 28 3n3K .1J63 682J100 .1J63 Now we’re going to attach the 682J100 breakout board to the PCB, as well as attach the wires to the breakout SOLDER board that will connect to the pots. BREAKOUT Have a small piece of masking tape BOARD TO on hand.
  • Page 29 Locate the three pots. If any pot has an index pin protruding from it, break it off with a pair of needle nose pliers. This will allow the pot to mount flush in the housing. CENTER FEEDBACK Before mounting the A10K Feedback pot in the center of the circuit board, place one section of the included double foam adhesive tape squares on the back of the Feedback pot to insulate it from the mounted electronic components.
  • Page 30 Protect your painted housing by laying a piece of paper or light cardboard with holes in it for the pots INSTALL REMAINING and footswitch on the housing before POTS temporarily attaching the components. DEPTH (B10K) WD 15-2 Remove the nuts and washers from the two RATE (A25K) remaining pots and insert their threaded...
  • Page 31 SOLDER POTS TO PCB Temporarily attaching the pots and footswitch to the pedal housing will help to keep things steady for soldering them to the PCB. Lay the PCB/breakout board component side up over 103 1M the pots. The shaft of the foot switch will help to support the PCB.
  • Page 32 Like some of the caps and diodes, the LED is polarized and has to be installed in a specific direction. The negative INSTALL LED lead of the diode has a flat 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 33 Remove the nuts and washers again from the pots and footswitch and lay the pedal housing face down. With INSTALL the component side of the PCB CIRCUIT facing up, carefully insert BOARD the shafts of the pots and footswitch into their holes. Reattach the washers and nuts using a 10mm wrench for the pots, and 14mm wrench for the switch.
  • Page 34 INSTALL THE DC JACK Insert the DC jack into the top of the housing making sure the longer of the two lugs is on the left. Using a 14mm wrench or needle nose pliers and 14mm nut, secure jack into housing just enough to allow the jack to rotate.

  • Page 35: Input Jack

    Model 12253 comes with two mono jacks. One will be your input jack and the other your SLEEVE INSTALL THE output jack. Insert the jack into the INPUT JACK left side of the housing with the tip connection facing up. Add the washer and thread the nut on to the shaft enough so that the pot can rotate freely.

  • Page 36: Output Jack

    Insert the output jack into the right side of the housing with the tip facing down. Add the SLEEVE INSTALL THE washer and thread the nut on to OUTPUT JACK the shaft enough so that the jack can rotate freely. You may need to rotate the jack to provide easier access to setting the solder joints.
  • Page 37 D LC COMPLETED VIEW With the output jack secured, this is what your pedal should look like. 470nK Congrats, on a job well done! Now, simply attach the back of the pedal, pop on the 470nK knobs, plug this thing in and bend some tone! 682J100 682J100 682J100...
  • Page 38 FINE TUNING TRIM POTS Adjusts the sweep, or general feel of the e ffect when it is engaged. Trim Pots Adjustments We suggest setting both trim pots to the 12 o’clock position as a default setting. Use a #0 Phillips screwdriver to adjust them to taste using your ears.
  • Page 39 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. Some switching supplies, as well as some linear (non-switching) pedal power supplies can be noisy.

  • Page 40: Technical Support

    Quality you can trust. For life. TECHNICAL SUPPORT: If you have any questions before, during, or after your build, please reach out to our Tech Support Team by email at service@stewmac.com. stewmac.com ©2022 StewMac. All rights reserved. • #12253 Updated December, 2022...