An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present. The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit. (Hint: calculate your answer using Ohms law.)
An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present. The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit. (Hint: calculate your answer using Ohms law.)
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present.
The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit.
(Hint: calculate your answer using Ohms law.)
Transcribed Image Text:SW1
Q1
photo transistor
X1
Q4
B1
X2
24V
Q2
R1 h
AND Gate
10K
R1
35 W
LA1
35W
16.45
Figure 1- switch/phototransistor Control Circuit (Left), & simplified Control Light Circuit (Right)
The transistors Q1 and Q2 must be sized for the application. How much current (Amps) will be drawn by
the lamp?
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