Learn to Solder: Tools and Techniques for Assembling Electronics by Brian Jepson & Tyler Moskowite & Gregory Hayes

Author:Brian Jepson & Tyler Moskowite & Gregory Hayes [Brian Jepson]
Language: eng
Format: epub
Tags: General, Technology & Engineering, Electronics, Materials Science, Industrial Design, TECHNOLOGY & ENGINEERING / Electronics / General
ISBN: 9781449337247
Publisher: O'Reilly Media
Published: 2012-05-11T06:46:29+00:00

Figure 2-4. Inserting an LED

Figure 2-5. Bending out the leads

Knowing Which Way a Component Goes In

Some components don’t care which way you put them in: resistors, some capacitors (such as the one that comes with this kit), and many other components fall into that category. On the other hand, LEDs are polarized; electrical current will only flow through them in one direction. So if you put your LED in backwards, it won’t light up at all. You can determine an LED’s polarity in a couple of ways: First, the longer of the two leads is the positive (+), and the shorter is negative (-).

Second, look closely at the bottom of the LED and examine the ring that bulges out around it. There is a flattened part of that ring that indicates the side of the LED that’s negative (-). You can see this flattened side on the right in Figure 2-6.

With ICs, this also matters. Every pin has a specific function, and there will be one or more pins for positive (+) and one or more pins for negative (-).

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