Mojo Maestro Assembly Guide
Damaged or Missing Parts All kits and parts are checked before being shipped to you. If something arrives damaged or if your kit is missing a part, please open a support ticket to inquire about a replacement. Missing parts will be replaced at our expense. Damaged parts should be returned for verification. If the part shows signs of use beyond what was necessary to determine that it was damaged, DIY Recording Equipment, LLC reserves the right not to replace the part.
Table of contents
- Required Tools
- Optional Tools
- Component Sorting Sheet
- Standoffs and Header (Bag 1)
- Insert Standoffs
- Populate 8-Pin Header
- Tape and Solder IC Socket
- Resistors (Bag 2)
- Bend Resistors
- Sort Resistors
- Place Resistors
- Solder Resistors
- Trim Resistors
- Capacitors and Diodes (Bag 3)
- Populate Diodes
- Populate Small Capacitors
- Populate Switches
- Populate Large Capacitors
- IC (Bag 4)
- Place IC in Socket
- Final Checks
- Set Options
- Help Us Improve
Required Tools top
We recommend an adjustable-temperature station, such as the Weller WLC100.
You can use 60/40 "leaded" solder or lead-free. We recommend 60/40 because it flows better and is easier for beginners to use.
You'll need a pair of good "snips" for cutting of the excess leads after soldering.
Optional Tools top
If a problem needs solving, a multimeter can come in handy. You can also use it to sort resistors.
If you accidentally solder something in the wrong place, a desoldering pump can save the day.
Component Sorting Sheet top
To identify and keep track of every part in the kit, download and print the Component Sorting Sheet (PDF).
Standoffs and Header (Bag 1) top
Insert Standoffs top
Note that there are two different ends on the plastic standoffs. The locking end has tabs with a right angle to prevent them from being removed after installation, while the non-locking end has smooth tabs. Insert the locking ends of the standoffs from the bottom of the PCB.
Populate 8-Pin Header top
Insert the 8-pin header into the holes marked “CON1.” Make sure to place the short, silver pins through the bottom of the PCB so that the PCB rests on the black plastic posts. Solder the header from the top of the PCB and do not trim the leads afterward.
Tape and Solder IC Socket top
Insert the IC socket so that the notches on the sockets align with the markings on the PCB. Secure in place with tape. Then flip the PCB over and solder in place. Remove the tape.
Resistors (Bag 2) top
Bend Resistors top
Bend the resistor leads 90 degrees at the body so they can be inserted into the PCB.
Sort Resistors top
Resistor sorting made easy! Enter a value to find the color bands, or enter your color bands to find the resistor’s value. Type in the value of the resistor you need and this tool will show you the corresponding color code.
Place Resistors top
Place the resistors into their respective positions on the PCB. As you place each resistor, bend its leads against the bottom of the PCB so that it stays in place during soldering.
Solder Resistors top
Solder the resistors to the PCB. Observe good soldering technique: heat the pad and lead for 2-3 seconds, apply a small bit of solder, and continue to heat the pad for another 2-3 seconds. The finished joints should be shiny and should have just enough solder to cover the pad entirely.
Trim Resistors top
Use clippers to trim away the excess leads. Clip as closely as possible to the joint without clipping the joint itself.
Capacitors and Diodes (Bag 3) top
Populate Diodes top
Place each diode so that the line on the component matches the line on the PCB. Double check the orientation, then solder and trim.
Populate Small Capacitors top
Place the smaller capacitors in their respective places. These capacitors are not polarized and therefore can be placed in either direction. Solder then trim the leads.
Populate Switches top
Place the slide switches and use a small screwdriver to bend a couple of the leads against the bottom of the PCB. Solder and trim.
Populate Large Capacitors top
These capacitors are polarized, so they must be placed in a certain direction. The positive lead is slightly longer, while the negative lead is marked with a stripe on the body of the capacitor. Place the capacitors with the positive lead in the pad next to the "+" marking on the PCB. Double check their orientation, then solder and trim.
IC (Bag 4) top
Place IC in Socket top
The leads of the IC must be slightly bent to fit perfectly into the sockets. Press one row of leads against a flat surface until they form a 90-degree angle with the body of the IC. Then do this for the other row.
IC polarity is indicated by a dot or notch on one side of the body. Align this side with the notch in the socket. Place the IC in this direction, and press it completely into the socket.
Final Checks top
Before you wrap up, check the following things:
Set Options top
The Mojo Maestro contains two options you can set via the slide switches.
Choose between SYM (symmetrical) or ASYM (asymmetrical). In SYM mode the top and bottom of the waveform are clipped. This mode generates even harmonics (2nd, 4th, etc.) and is the more aggressive of the two. In ASYM mode, one of the diodes is taken out of circuit so that only one side of waveform is clipped. This creates both odd and even harmonics, and preserves more of the integrity of the original signal than symmetrical clipping.
Choose between GLUE for subtle saturation and MOJO for intense distortion, with a 4k low-pass filter to remove harsh upper-harmonics.