Electrical and Electronic Systems and Practice I by G. D. Bishop (auth.)

By G. D. Bishop (auth.)

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C. level. A subtraction amplifier performs a similar operation; it is often called a differential 31 amplifier. The effect is to invert the negative signal and then add it to the positive signal, each being multiplied by a factor if desired. For instance, a mathematical equation such as 5a + 7b 3e can be solved with ease, where a, band e are electrical signals. Integration and differentiation, multiplication and division and logarithmic amplifiers are also constructed with ease to perform the basic mathematical functions.

17 Why do high-frequency signals travel shorter distances than low-frequency signals? 13b, write the mathematical expression for a 27 10 V, 100 kHz carrier signal modulated with a 100 mV, 1 kHz audio tone. 18. 20 A carrier of f = 100 kHz is amplitude-modulated by two sine waves VI = 4 sin 314 t and V2 = 10 sin 3140 t. Draw the frequency spectrum and show all relevant frequencies. 3 System Inputs and Outputs Electrical and electronic systems are primarily concerned with the amplifying or processing of signals which are generated by either a transducer, another system, radio sources or the system itself, as in an oscillator circuit.

9c. 9c is a load resistor R, which represents the output circuit(s) to which the power supply is connected. The capacitor has the effect of charging to 340 V on the first half-cyde (1). This charge then leaks away gradually while the diode is switched off through the Mains voltage 340 240 (a) 1... 9 Half-wave rectification (c) 37 load resistor until the next half-cyde appears (3). The capacitor is again charged up and the same process is repeated. c. c. signal caused by the continual charging and discharging of C.

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