Precautions that should be observed while handling MOSFETS.
- Never insert or remove MOSFET from a circuit with the power ON.
- Never apply input signal when DC power supply is OFF.
- Wear a grounding strap on your wrist when handling the MOSFET device.
An electrostatic CRT has parallel deflection plates 1.5 cm long and 6mm apart. The screen is 55cm from the centre of the deflecting plates. The deflecting and accelerating potentials are 150 V and 2.5 kilovolts respectively. Determine the:
Ld = length of deflecting plates, m d = distance between deflecting plates,m m = mass of the electron ,kg L = distance between screen and the centre of the deflecting plates, m Ea = accelerating voltage to the plates, volts Ed = deflecting potential of the plates (I) Velocity of the electron Soln Velocity of electron, Vox = √{(2eEa)/(m)} Ea = 2500 v Ed = 150v Ld = 1.5cm L = 55cm d = 6 mm m = 9.1094 x 10^-31 kg e = 1.6022 x 10^ -19 Coulombs = {√ (2 x 1.6022 x 10^-19 x 2500)/(9.1094x 10^-31)} = √ 8.794x 10^ 14 = 29655037.64 m/s (II) Amount of deflection D = {((L x Ld x Ed)/(2 x d x Ea)) x (m)} = {((0.55 x 0.015 x 150)/(2 x 6 x 10^-3 x 2500))} = 0.04125 m (III) Deflection sensitivity = { ( Ld x L )/(2 x d x Ea)} = { ( 1.5 x 10^ -2 x 0.55)/(2 x 6 x 10^ -3 x 2500)} = 2.75 x 10^ -4 m/ volt (IV) Deflection factor = 1/deflection sensitivity = 1/ ( 2.75 x 10^ -4) = 3636.3636 volt/meter
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