Non-Contact AC Voltage Tester Circuit

A non-contact AC voltage detector is a device that detects the presence of AC (Alternating Current) voltage without physically touching the electrical conductor or circuit. It uses electromagnetic induction or capacitive coupling to sense the voltage.

How it Works:

1. Electromagnetic induction: The detector senses the magnetic field generated by the AC current flowing through the conductor.
2. Capacitive coupling: The detector senses the electric field generated by the AC voltage.

Types:

1. Transistor-based detectors (e.g., BC547)
2. IC-based detectors (e.g., IC LM358)
3. Hall effect sensors
4. Optical sensors

Components Required:

• BC547
• Buzzer
• LED
• Wire For Antenna
• Power supply
• Connector

Gerber File:

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Circuit Diagram:

BC547 Transistor:

The BC547 is a popular NPN bipolar junction transistor (BJT) commonly used in electronic circuits.

Key Features:

1. NPN (Negative-Positive-Negative) transistor
2. Low voltage, low current
3. High current gain (β) = 100-300
4. Collector-emitter voltage (Vce) = 45V
5. Collector current (Ic) = 1A
6. Base-emitter voltage (Vbe) = 5V

Pin Configuration:

1. Base (B)
2. Collector (C)
3. Emitter (E)

Applications:

1. Amplifiers
2. Switches
3. Voltage regulators
4. Audio circuits
5. Non-contact voltage detectors

Equivalent Transistors:

1. 2N2222
2. 2N3904
3. BC548
4. BC549

Package Types:

1. TO-92
2. TO-18

BC547 Circuit Examples:

1. Non-contact AC voltage detector
2. Simple amplifier
3. LED driver
4. Relay driver
5. Audio preamplifier

BC547 Specifications:

Parameter	Value	Unit
Vce	45	V
Ic	1	A
Vbe	5	V
β	100-300	–
fT	100	MHz
PD	625	mW