Electronics II by G. D. Bishop (auth.)

By G. D. Bishop (auth.)

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6 The aquadag coating is (a) a graphite coating to repel secondary electrons (b) a graphite coating to collect secondary electrons (c) a cathode coating to emit electrons (d) a cathode coating to repel electrons } (c) at right-angles to the axis of the tube (d) at right-angles to the magnetic field persistance than a TV screen. c. 8kHz 31kHz 4 Small Signal Amplification The devices and circuits described so far have not allowed direct connection of input signals from, say, a microphone or an oscillator, nor have they allowed direct connection to, say, another amplifier or measuring instrument.

Oscilloscopes have an internal sawtooth generator, called a timebase, whose frequency can be adjusted to suit the signal being applied to the input ¥-terminals. c. potential is added to the X-sawtooth to add a positive potential to either the left or right plate to move the whole beam as required. (2) X-gain the amplitude of the scanning sawtooth is adjusted to give a small or large deflection, the intention being to fill the screen with the applied sawtooth. c. potential is applied to the Y-plates along with the applied signal, to move the entire beam up or down.

6 is used then I Bcan be calculated from IB = Vxl Rb = (Vee- VBE)/ Rb; since Vee and Rb are known then I Bcan be found from knowledge of VBE and so l'IN. 4 Power Gain, A P Power is normally expressed as voltage x current and has the units of watts. 2) The power gain can also be expressed as a decibel gain as follows. 2. 3 Current Gain, A; In a similar way the current gain can be found using one of two methods. 6. AP =PouT! 2. 5 Thermal Runaway A transistor such as the BC107, whose characteristics have been used in this chapter, has a maximum power rating of 300mW for temperatures of 25 oc or less.

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