Color-code the schematic. This document comes with the parts and illustrates the layout of the circuit. It denotes which component fits in which turret board and which components are connected. It also contains information about the values of the components. Use a set of colored marker pens to mark the part, the turret on the circuit board and the schematic symbol. This makes it easier to check your work when populating the board.
Fit the board-mounted components into the relevant turret on the blank circuit board, as per the schematic. Start with the capacitors, transistors, diodes and resistors, and finish with the potentiometer and switches. Push each component into the board so the connector pins poke through the base.
Turn on a soldering iron. If your soldering iron has multiple heat settings, select the lowest one.
Flip the board over so it's face up. Gently press each connector pin so it sits flat against the copper conductor strip.
Put a small amount of solder onto the tip of the iron. Press the tip against the connector pins and the copper conductor strip simultaneously. This fuses the component to the board and establishes a connection between the components.
Screw the circuit into the base of the switcher chassis with 4-40 gauge screws and a Phillips screwdriver.
Mount a 1/4-inch jack on the single predrilled hole on the right of the chassis. Fit a washer to the outside portion of the jack barrel.
Mount the 1/4-inch output jacks on the left. Depending on the parts you are using, there can be anywhere between two and eight output jacks. Each has a predrilled hole. Fit a washer to each.
Cut a single one-inch piece of wire for each jack. Solder a piece of wire to the output terminal on the inside of the jack.
Solder the other end of each wire to the relevant eyelet on the board, as per the schematic.
Solder the battery snap red wire to the positive eyelet. Solder the black wire to the negative eyelet.
Flip the board over and cut the copper conductor strips as indicated by red blobs on the schematic. This isolates the transistors and renders each output as a separate signal chain. This is integral to the nature of the switcher.
Fit a 9-volt battery to the battery snap.
Screw down the chassis lid.