Question

Assignment 4 0 QI ( ) What is the main problem of using mechanical ON-OFF switch as input interface ? Q2 ( What is "Debouncing" ? Q3 What are the consequences of having Contact Bounce ? 04 What is the Truth Table of the ic 74LS14. Q5 What is the function of the below circuit ? +5v open Schmitt Inverter R2 - closed - open w 10022 Vour 74LS14 Switch closed T UF Switch open: T = C(R,+R2) = 10.1ms Switch closed: T = C(R2) = 0.1ms

Answer 1

Answert 1 In any electronics of digital circuits, the major problem is that the mechanical switch is input interfaced too could read these multiple switch operations as a sesies of on and off signals several milliseconds instead of inst the one intended single and positive switching action. switch & This multiple switch closing of Contacts , {look. Bouncing opening action is called Switch Bounce. 9t5v switch open Closed switch position ovt snitch position (2) Ansi - Debouncing - In previous part-(1), we have discussed about Switch Bounce. We have to remove bounces and the method to get rid of such bounces is called Switch Debouncing. A debouncing circuit is used to eliminate the unwanted ripple signal and provides a clean transition at its output. at switch Debouncing can be implemented by 4 different ways ! ☺ Hardware Debouncing (1) Software Debouncing (1) R-C Debouncing (iv) Using Debouncing It's (3) Anst Contact Bounce! When a switch is actuated and contacts tounch one another under the force of actuation, due to the mass of the moving contact and any elasticity inherent in the mechanism of Contact materials, contacts will bounce upon closure of period of milliseconds before coming to full rest. This is called Contact Bounce.

Switch to gt Common Osciloscope's do Aaltimeters transient response is distated from due to Contact bounce. Switch is actuated L Contact Bouncing Bantliveter screen SciMoscope (4 Answera Touth Table of 742514 742514 IC is a basically Inverter which is called Hen Inverter Schmiast Trigger. Iswitch Input output Position Signal Signal open ON(1) OFF (0) closed OFF(0) ON(1) (5) Answers from giren figure, I cases when switch is opend condition, Cussent passing through loker & Icon & IMF and capacitor etarred will charge up to +5 V. That means Input signal of Inverter is ON Condition ('l'logic), Inverter will do inverting the signal, that means output of Infrinverter is off condition (o logic). I Case! When switch is closed condition, Capacity voltage will go to o voit that means input is off condition, so inverter will do inverting the signal & olp of inverter is ON condition (Illogic). Ilp Signal | olp signal 1 Y output signal I A Input signal