Timer Circuit UNLISTED

Not provided.

How to use

Click 'Open in editor' (blue)

Click 'Simulate' (bottom)

Click 'Run Time-Domain Simulation' (middle left)

Phase 1:

Robot still driving around track.

Stop LED on (shown on bottom graph)

Transistor is a short circuit

Capacitor bypassed therefore discharged. V-=0v

V_out=Ad(V+ - V-) = 10^6(4.5 - 0) = 4.5*10^6= Vs+ (due to saturation) = 9v

Phase 2:

Robot reach white line.

Stop LED off (shown on bottom graph).

Transistor acts not connected

Capacitor starts charging V(Capacitor) on top graph

Phase 3:

Remember V(Capacitor) acts as V- and is increasing

• At 13s: V_out=Ad(V+ - V-) = 10^6(4.5 - 4.3) = 0.2*10^6= Vs+ (due to saturation) = 9v

• At V+=V- V_out=Ad(V+ - V-) = 10^6(4.5 - 4.5) = 0v

• At 14s V_out=Ad(V+ - V-) = 10^6(4.5 - 4.6) = -0.1*10^6= Vs- (due to saturation) = 0v