An introduction to electronics by The Open University

Author:The Open University
Language: eng
Format: epub
Publisher: The Open University
Published: 2018-01-06T00:00:00+00:00

Figure 36 ‘Yes’ and ‘no’ in the frequency domain: (a) ‘yes’ has a pattern with many high-frequency components; (b) ‘no’ has a pattern with few high-frequency components

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4.9 Amplifying signals

Most of the electrical signals that record sounds are very weak. For example, a guitar pickup generates electricity as the metal string vibrates in a magnetic field. The amount of electricity that can be generated in this way is limited and typical voltages are in the order of 100 mV. To become useful, this signal needs to be amplified. This means, literally, that the amplitude of the signal has to be increased.

One way to amplify a signal is to use an operational amplifier (op-amp) with two resistors connected to form an amplifying feedback circuit, as shown in Figure 37.

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