• Model Number: FA940, FK940
• Product Type: Electronic Educational Kit
• Assembly Status: Pre-assembled circuit board module
• Power Supply: 9V DC Battery (Not included)
• Current Consumption: Max 32mA
• Display Type: 4 Color LEDs (1 Green, 2 Yellow, 1 Red)
• Sensor Interface: Dual Contact Touch Sensor Plate
• Sensitivity Control: Onboard VR100K Trimmer Potentiometer
• Size: Main board approx. 44.5 x 49.3 mm, Sensor board approx. 21.3 x 41.7 mm
• Recommended Enclosure: Future Box FB03
• Country of Origin: Thailand

The Future Kit FA940 Lie Detector Kit delivers an interactive electronic experience crafted for STEM enthusiasts, students, and hobbyists. Operating on bio-electric skin resistance principles, the circuit detects minute electrical conductivity shifts when fingers contact the dedicated sensor pads. An onboard transistor switching network analyzes incoming signals in real time and translates biometric responses into intuitive visual indicators across four graduated LEDs.

Engineered with quality electronic components, this educational Lie Detector Kit features an integrated calibration trimmer to balance baseline skin resistance across diverse testing environments. Compact and fully portable, it provides an engaging, hands-on demonstration of analog sensor feedback and signal amplification for science fairs, classroom activities, and recreational entertainment.

- Visual Feedback Array: Four color-coded LEDs provide graduated detection levels from normal to high response.
- Adjustable Sensitivity: Onboard VR100K potentiometer allows quick baseline calibration for different skin types.
- Educational Circuitry: Demonstrates multi-stage transistor switching and analog signal amplification.
- Portable 9V Operation: Functions on a standard 9V battery for cord-free tabletop use anywhere.
- Practical Learning Experience: This Lie Detector Kit makes abstract electronic concepts easy to visualize.

• Printed Circuit Boards: High quality copper-clad boards for main unit and dual touch sensor.
• Amplification Transistors: Five C458 NPN silicon transistors for signal processing stages.
• Signal Diodes: Six fast-switching diodes to establish precise voltage drops.
• LED Display: Four vibrant LEDs in green, yellow, and red for visual output.
• Trimmer Potentiometer: Precision VR100K variable resistor for sensitivity tuning.
• Passive Network: Fixed carbon film resistors and filtering capacitors for circuit stability.
• Integrated Module: High grade components combine seamlessly in this Lie Detector Kit project.

1. Connect a 9V DC battery clip to the positive and ground terminals observing correct polarity.
2. Turn the VR100K trimmer until only the green LED remains faintly lit or off at rest.
3. Place two fingers firmly across the dual conductive touch sensor pads.
4. Ask questions and watch the yellow and red LEDs activate as conductivity changes.
5. Readjust the VR100K trimmer whenever testing different participants or room conditions.

FR-2 Copper Clad Printed Circuit Board, Dual Touch Sensor Plate, C458 NPN Transistors, Switching Diodes, 5mm Green LED, 5mm Yellow LEDs, 5mm Red LED, VR100K Trimmer Potentiometer, Carbon Film Resistors, Ceramic Disc Capacitor, Radial Electrolytic Capacitor, Connecting Leads, RoHS Compliant Solder Joints.