By G. D. Bishop (auth.)
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Extra info for Electrical and Electronic Systems and Practice I
1i), which generates a 50 mV signal ifthe gas density rises above the danger limit. This output signal might be coupled to an external amplifying circuit to sound an alarm. A second transducer, not illustrated, is the proximity detector, which comes in many forms. One type operates on the capacitor principle, the presence of an object or person changing the capacitance of the area and, after amplification, sounding an alarm or signal. The second type is that used at traffic lights, where inductive loops coupled to an oscillator circuit are SYSTEM INPUTS AND OUTPUTS embedded in the road.
C. Control Feedback signal voltage '---+---i processing circuit (rectification) t h r------l System output (constant amplitude) oscillating current in the transmitting aerial creates an oscillating magnetic field which passes through the air. The receiver aerial, if correctly positioned and tuned, crosses the path of these radio waves and oscillating induced voltages are created across its ends. 12. 1. 12. A high-frequency signal from a generator is coupled to a simple transmitter aerial; the receiver comprises a similar aerial system and the simple radio detector diode.
Signal Amplitude Uniform response television signals also carry their own synchronisation signals to lock the line and frame circuits of the observed picture (try adjusting the line or horizontal hold and the frame or vertical hold). Top-secret communicators use special coding systems called scramblers with far more complex coding circuits. 7 and in figure 2. 12-namely the radio detector. The radio signal, after detection, appears like the top half of the transmitter signal. A filter is required at the output to eliminate the high frequencies and leave just the audio signal.