About the Project
The aim of this project was to design an amplifier capable of amplifying ECG signals by at least 1000 times. The circuit was designed primarily for ECG signals but also for various biological signals. The project consisted of three main stages: amplifier design, filter implementation, and testing.
Design Features
- Amplification: The circuit was designed to amplify signals by 1000 times (Gain = 1000).
- Instrumentation Amplifier: LM348N op-amp was used for its low noise characteristic.
- Power Supply: Powered by two 9V batteries to avoid mains noise.
- Filters: Low-Pass, High-Pass, and Notch filters were designed to improve signal clarity and eliminate noise.
Filter Design
Various filters were applied to improve the clarity of ECG signals. These filters aimed to eliminate high-frequency noise, DC offset, and 50Hz mains noise.
- Low-Pass Filter: Reduced high-frequency noise.
- High-Pass Filter: Eliminated DC offset.
- Notch Filter: Suppressed 50Hz mains noise using a Twin-T configuration.
Results
The amplifier successfully amplified the ECG signals at the desired rate. Thanks to the filters, noise was significantly reduced, and a cleaner signal was obtained.
