Circuit Documentation

Summary of the Circuit

This circuit appears to be a simple light-activated switch using a photocell (LDR) to control the flow of current through a BC547 transistor, which in turn controls the illumination of an LED. The circuit is powered by a 9V battery. Two resistors are included in the circuit, likely for current limiting and biasing purposes.

Component List

Resistor 1

• Component Name: Resistor
• Resistance: 470 Ohms
• Purpose: This resistor may be used for current limiting to protect the LED or for biasing the transistor.

Resistor 2

• Component Name: Resistor
• Resistance: 100 Ohms
• Purpose: This resistor is likely used in conjunction with the photocell to form a voltage divider, which sets the biasing of the transistor's base.

LED: Two Pin (white)

• Component Name: LED
• Type: White, Two Pin
• Purpose: The LED is the output indicator of the circuit, which lights up when the transistor is turned on.

BC547 Transistor

• Component Name: BC547 Transistor
• Type: NPN Bipolar Junction Transistor
• Purpose: The transistor acts as a switch, controlling the current flow through the LED based on the voltage applied to its base.

Photocell (LDR)

• Component Name: Photocell (LDR)
• Type: Light Dependent Resistor
• Purpose: The photocell changes its resistance based on the amount of light it receives, which in turn affects the transistor's base voltage.

9V Battery

• Component Name: 9V Battery
• Voltage: 9 Volts
• Purpose: Provides the power necessary for the circuit to function.

Wiring Details

Resistor 1 (470 Ohms)

• Pin 1: Connected to the positive terminal of the 9V battery.
• Pin 2: Connected to the cathode of the LED.

Resistor 2 (100 Ohms)

• Pin 1: Connected to the positive terminal of the 9V battery.
• Pin 2: Connected to pin 0 of the Photocell (LDR) and the base of the BC547 Transistor.

LED: Two Pin (white)

• Cathode: Connected to pin 2 of Resistor 1 (470 Ohms).
• Anode: Connected to the emitter of the BC547 Transistor.

BC547 Transistor

• Collector: Connected to pin 1 of the Photocell (LDR) and the negative terminal of the 9V battery.
• Base: Connected to pin 2 of Resistor 2 (100 Ohms).
• Emitter: Connected to the anode of the LED.

Photocell (LDR)

• Pin 0: Connected to pin 2 of Resistor 2 (100 Ohms).
• Pin 1: Connected to the collector of the BC547 Transistor and the negative terminal of the 9V battery.

9V Battery

• Positive (+): Connected to pin 1 of both resistors.
• Negative (-): Connected to the collector of the BC547 Transistor.

Documented Code

There is no microcontroller or embedded code associated with this circuit as per the provided inputs. Therefore, this section is not applicable to the current documentation.