A second-order lowpass filter removes ripple from the envelope detector's output

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Other Materials from the Main Document

• Article «Broken-coil detector is simple yet robust»
• Figure 1. An oscillator generates a stable signal based on the values of L₁, L₂, and C₁
• Figure 2. A lowpass filter changes the oscillator output into an envelope signal
• Figure 3. A second-order lowpass filter removes ripple from the envelope detector's output
• Figure 4. Comparator IC₆ monitors the voltage across C₆ and activates when the C₆ voltage exceeds a preset value from R₁₅