Question

1. Analyze the next circuit, determine what happens when S1-"1" and S1-10". Explain perfectly the operation of the circuit, indicating logical states of each component, status of the LEDs (on or off) and operating region of the transistor in each position of S1. Done the previous thing, mention for what is used the circuit voC 5.0V R3 LEDI LED2 U1A U1B 7404N 7404 N R1 5.0V S 1 R2 Key-Space Q1 2 N390 4 R4 7404N 34700

Answer 1

Denoting 5 v with logic ' 1 'and 0 v with logic ' 0 ' as high voltage applied across base of Theta_1, transistor is in saturation rightarrow voltage at input of U I C = 5 v (logic c ' 1 ') rightarrow as high voltage appear across L E D, terminals, L E P, is OFF rightarrow as 5 v net voltage across L E D 2, L E D 2 is ON \r\n hence with s_1 = ' 1 ' , L D E_1: OFF L E D_2: ON Theta_1 in saturation rightarrow logic across different component are mentioned in diagram when s_1 = 0 as low voltage appear across Theta_1 base, hence Theta_1 is in cut off rightarrow voltage a^1 input of U I C = ' O V '