The Heart of the Matter: A DIY ECG/EKG Circuit Explained
Ever wondered about the electronics behind a heartbeat monitor? This fantastic diagram illustrates the fundamental principles of a single-lead
Electrocardiogram (ECG or EKG) circuit, showing how a biological signal is captured, processed, and displayed.
Let's break down the key stages:
1. Signal Acquisition: Electrodes placed on the body pick up the heart's very faint electrical pulses.
2. Amplification: The heart of the circuit is the AD624 Instrumentation Amplifier. Its job is to take that tiny, microvolt-level signal and boost it significantly while rejecting common noise from the body.
3. Filtering: A simple Low-Pass Filter is used after the amplifier to clean up the signal, removing high-frequency noise (like muscle tremors or 60Hz power line interference) to reveal the classic, clear ECG waveform.
4. Display: The final analog signal is then converted and sent to a computer to be visualized.
CRITICAL SAFETY DISCLAIMER: This diagram is for educational and informational purposes ONLY and is NOT a medical device. Building and connecting homemade electronic circuits to the human body is inherently dangerous. This should only be attempted by experienced individuals with a deep understanding of biomedical electronics, signal isolation, and electrical safety. Never use a DIY device for medical diagnosis or treatment.
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