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The printed circuit board (PCB) holds the components in this circuit. All of the components will be
installed on the “component side” of the board, which is the side that has the part numbers on it. The
other side of the board is called the “solder side”, which, as the name implies, is the side on which
the legs of the components are soldered to the board. Proper technique for installing and soldering
components to a circuit board is demonstrated through several great resources on Instructables and
Youtube under the search “PCB soldering tutorial.” The general procedure consists of the following:
1. Install the part on the “component side” of the board, by threading the wire leads
through the appropriate holes in the board. For your convenience, the board has
silk screen outlines indicating where the components should be placed, along with
text indicating the part number and the component value.
2. Hold the component in place with your finger and turn the board over.
3. Gently bend the leads out at about 45 degrees to keep the component from falling
out of its holes.
4. Install all of one type of component, bending each of the leads as they are installed.
5. Flip the board over solder-side-up, and solder all of the components in one pass.
6. Clip the leads off with small diagonal cutters, right at the solder joint.
Let’s begin!
1. Resistors: The values of resistors are given by a series of colored stripes on their body. There are
several tutorials online describing how to decode these stripes, but we will identify each resistor
for you by simply naming the stripe colors, and giving you the value and the part number.
“Figure 3: Component Values and Locations” is a good reference. If you are color blind or can’t
see the stripes clearly, then you must use your digital multimeter to measure the resistance of
each resistor.
Resistors are not polarized, meaning they can be installed in their holes in either direction. It
doesn’t matter which lead goes in what hole.
The hole spacing of most of the resistors on the circuit board allows the leads to be (gently) bent
90 degrees at the body of the resistor (1). This allows most resistors to slip into their holes very
easily. Resistors R7 & R8 are exceptions (2). Note how those two components are bent.
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