Troubleshooting Electronic Circuits by Ronald Quan

Author:Ronald Quan
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2020-04-15T00:00:00+00:00

CHAPTER 11

Troubleshooting Analog Integrated Circuits

We will be exploring various types of circuits and systems that use analog integrated circuits as examples of troubleshooting, debugging, and improving. Many of the circuits shown in this chapter will have come from the web (world wide web) or from magazine articles or books. When we build hobby circuits, or fix commercially manufactured products, generally one would assume that the circuits are reliable in terms of performance/design with replaceable parts. From my experience building hobby circuits, working in repair shops or radio stations, and teaching students, I have found that troubleshooting circuits can be broken down into the following categories:

• There are some circuits that will not work or will not work very well as shown in the schematic. These circuits will require some redesigning.

• There are some circuits that will work as a “one of a kind” but may not be repeatable due to the design. This type of design sometimes works by luck. For example, a photodiode circuit seems to work if a minimum amount of light falls on it because the op amp may not have the capability to output down to 0 volts but have to start at about +1 volt (e.g., see Figure 11-18).

• Many circuits published really do work. And these circuits will perform fine as shown in the schematics or instructions. However, sometimes it may be “easy” to mis-wire a circuit or put in the wrong part. Other times, the circuit may work in “normal” consumer everyday use but will break down under 24/7 schedules due to overheating, for example. Using a higher-power device can fix this problem.

We will concentrate on the first two categories—circuits that are redesigned for more reliable operation.

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