Touch Sensor Using BC547
Touch Sensor Using BC547
Oct 1, 2020
instructables.com
Touch Switch Circuit Using BC547 & BC557 (Modified to Control Bulb) 🧠 Introduction This is a simple touch-sensitive switch that works by detecting the resistance of human skin. When you touch the sensor plates, the circuit activates for a short time — enough to light an LED or control a connected load. In this modified version, instead of just glowing a small LED, we add a PNP transistor (like BD140 or TIP42) to drive a higher current load such as an incandescent bulb. --- ⚙️ Circuit Components
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