Jameco Electronics 2176106 User manual

Analog Guitar Overdrive Pedal
PART NO. 2176106
A solid-state overdrive/distortion effects pedal for guitar and other musical instruments. By including or leaving out optional
components (included) this pedal can be "tweaked"by you, the builder, during assembly to deliver tones for blues or rock. Or try your
own parts to build an effect that is uniquely your own!
Features:
True bypass switching: won't alter your tone when switched out
LED indicator
Die-Cast metal case for durability
Knobs control Drive and Level independently
Builder-customizable design for musical flexibility
All parts, circuit board, drill templates, and troubleshooting guides included.
Time Required: 3-4 hours depending on experience
Experience Level: Intermediate
Required tools and parts:
Soldering Iron and Solder
Needle-Nose Pliers or Hemostat
Wire Cutter (side cutters)
Wire Stripper
Drill bits and drill for drilling metal case (drill press recommended)
Voltmeter (optional, but recommended for troubleshooting)
Bill of Materials:
Qty Jameco SKU Component Name
1 11965 Aluminum Case
1 251125 RC4558 Dual Op-Amp, 8 Pin DIP
2 286302 100K Pot, Linear
1 281738 1/4" Audio Jack (Mono)
1 281746 1/4" Audio Jack (Stereo)
1 333973 Unicolor LED
1 23077 LED Holder
1 151116 0.1uF 25V Disk Capacitor
1 330431 1uF 25V Electrolytic, Radial Pkg
1 15190 0.001uF 50V Ceramic Disk Cap
1 15405 22pF 50V Ceramic Cap
1 15229 0.01uF 50V Ceramic Disk Cap
2 691585 1.0 Meg Ohm Carbon Film 1/4Watt
1 216427 9V Battery Holder
4 126981 Rubber Feet
2 264990 Knobs
1 526299 8-Pin DIP Socket
1 691024 4.7K Ohm Resistor, Carbon Film, 1/4 Watt
1 691489 390K Ohm Resistor, Carbon Film, 1/4 Watt

Step 1 - First Things First
1) If you're new to this kind of thing, familiarize yourself with the key.
2) Check to see if you received all your parts.
3) Some extras you'll need:
- Soldering Iron
- Solder
- Wire
- Drill and drill bits (1/2", 3/8", 5/16", 1/4")
- Voltmeter (optional)
Step 2 - Getting Familiar
Familiarize yourself with the parts key.
Step 3 - Getting Familiar (Cont.)
Use this color key to find resistor values
2 36038 1N4148 Silicon Diode
1 690865 1K Ohm Resistor, Carbon Film, 1/4 Watt
1 151590 DC Power Jack
1 35991 1N4004 Silicon Diode
1 2181415 Stomp Switch, 3PDT

Step 4 - Assemble Circuit
Insert components in circuit board, referring to the parts list and circuit board labeling. All soldering is to be done on the copper side of
the circuit board. Allow the soldering iron to warm up before starting. Once heated, proceed with soldering to the circuit board. Joints
should be shiny and isolated (don't bridge connections).
Use caution installing the two diodes and the one electrolytic capacitor (C5). These parts must be oriented correctly according to the
diagram.
Resistors:
R1 = 1,000 ohms = 1k
R2 = 1,000,000 ohms = 1 Meg
R3 = 1 Meg
R4 = 4.7k
R5 = 390k
Capacitors:
C1 = 0.01 uF
C2 = 0.1 uF
C3 = 22 pF
C4 = 0.001 uF
C5 = 1 uF
Diodes:
D1 = 1N4004 (the fatter, black one)
D2 = 1N4148 (the smaller, narrower one)
Chip:
IC1A = RC4558
Step 5 - Drill Case
Drill bit sizes:
In/out Jacks: 3/8 inch
Both Potentiometers: 5/16 inch
LED: 1/4 inch
Switch: 1/2 inch
DC Power: 1/2 inch
First, print out the provided drill template. It should be the same size as your case so that you can cut and tape it to remain centered
during the drilling process.
Then, drill pilot holes (using a 1/8" drill bit) at the indicated locations.
Finally, drill case as indicated in diagram, using the appropriate drill bit sizes.

Step 6 - Point to point wiring
Follow the provided diagram carefully. Be sure to cut appropriate wire lengths (not too long or short). Color coding your wires is
helpful, but not necessary. The color of the wire does not affect the circuit in any manner. Strip about 1/4-1/2 inch of the insulating
layer off each end of the wires so that the metal is exposed. This is necessary to correctly solder. When connecting wire to the
external components (i.e. jacks, switch, etc.) use "mechanical" connections before soldering. In other words, "wrap" the wire through
the loop and back around so that it is physically stable. Then, proceed in soldering, so that the electrical connection is properly made.
Be careful to wire the switch with the correct orientation. In the diagram, the prongs should direct horizontally.
Correct prong orientation: --- --- ---
Incorrect prong orientation: | | |
Also, make sure that the switch rests in the case with the push-button side pointing out.
Step 7 - Placement Diagram
Shown in this picture is the spatial orientation of the fully assembled pedal, as seen from the bottom. The wires in the diagram have
been removed for clarity, but will obviously be present in the pedal by this step. A piece of electrical tape covering the soldered side of
the printed circuit board (PCB) will act as a good insulator against accidental grounding with the aluminum case. The PCB can be
placed as shown, or in any convenient way so as to allow the bottom lid to be securely fastened. Again, the electrical tape is good
practice here to prevent accidental touching of the solder joints to the enclosure. Otherwise you might get some nasty static noise
and/or "popping" when hooked up to an amp.

Step 8 - Troubleshooting
1) Power up the board with the IC (op amp) not in the socket. Confirm that the LED lights when the cable is inserted into the input
jack. This "activates" the circuit by creating a metal to metal connection that functions as a switch. If the LED doesn't light, click the
stomp switch. If it does not light after that, check all the solder connections. Make sure there are no loose solder joints or unintended
bridges between connections.
*NOTE*: It is important to unplug your input cable when not using the pedal to preserve battery life. If left in, the circuit will stay on,
and continue to use the battery.
2) Test voltage across pins 8 and 4 of the op amp socket using a voltmeter (+9V and GND). Looking from above with the circular
indent at the top, pin 4 is the lower left pin and pin 8 is the upper right. It should read something close to 9V (polarity doesn't matter for
measuring voltages, other than displaying positive or negative values). If all good, unplug the battery, insert the op amp into the
socket, and play test. If it doesn't work, confirm that all the parts are installed correctly according to the given diagrams.