By Robert Goodman
A advisor to knowing and repairing electronics apparatus written for those who might usually name the store. totally illustrated, uncomplicated to exploit advisor, you'll get a snatch of the workings of the electronics international that surrounds you, or even discover ways to make your individual maintenance.
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Extra resources for How Electronic Things Work... And What to do When They Don't
The top one is a 25 watt and should be used for all PC board soldering. The larger 45-watt iron is used for soldering chassis grounds and large-wire connector lugs. Figure 1-47 is of a soldering gun and it only heats when the trigger switch is pulled on. These guns will heat up in about five seconds and usually are high wattage. They should not be used for soldering on PC boards because you can damage one very quickly. Many of these guns are rated a 100 to 150 watts. Figure 1-48 shows how a small iron is used to solder in the pins of an IC.
A digital multimeter is being used in Fig. 1-44. You will find more power-supply information and circuits plus troubleshooting tips in other chapters of this book. FIGURE 1-44 A digital multimeter is being used to check a “block-type” plug-in power supply. 32 INTRODUCTION TO VERY BASIC ELECTRONICS “101” Electronic Circuit Soldering Techniques When removing or replacing parts on a PC board, you will need a soldering iron (20 to 25 watts), rosin “flux” or solder with a rosin core. A solder wick, which is a flat-braided copper strips is a useful aid for soaking-up solder when removing a part from the PC board.
1-33 and its circuit drawing is shown on the right side of Fig. 1-32. A photo of some common 16- and 18-pin in-line ICs are displayed in Fig. 1-34. Solid-State Scope Sweep Checker You can build this simple checker that tests transistor, diode, Zener diode, SCRs, and even some ICs. This device connects to an oscilloscope to make a fast “go-no-go” test unit. This little sweep checker can even be used to check resistors, capacitors, and find shorts and open cirKey 14 Pin IC NC 1 14 NC Comp 1 2 13 NC Guard 3 12 Comp 2 8 Input signal - 2 Chip 4 1 7 - Chip 6 TV 11 + + 5 10 Output signal Guard 6 9 NC -V 7 8 NC 3 5 4 Key NC = No internal connection FIGURE 1-32 The circuit diagram and case layouts for two types of ICs.