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Adam Stanton

Progress Report Identifying a specific frequency. Adam Stanton. Commonly used Wide frequency response (10Hz – 30kHz) High noise floor (sum of all noise sources and unwanted signals) Uneven frequency response Input voltage of 1.5V Transistor causes excessive noise

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Adam Stanton

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  1. Progress Report Identifying a specific frequency Adam Stanton

  2. Commonly used • Wide frequency response (10Hz – 30kHz) • High noise floor (sum of all noise sources and unwanted signals) • Uneven frequency response • Input voltage of 1.5V • Transistor causes excessive noise • High output impedance (1k to 5k) • Limited signal output Electret Microphone • If supply voltage is increased to 9V, both input and output noise is reduced • Using an op amp will buffer output and reduce output impedance

  3. Passes frequencies within a certain range and rejects frequencies outside that range. • A band pass filter can be made with a combination of high pass and low pass filters Band Pass Filters

  4. 20 to 1 frequency range with an external resistor • Logic compatible output with 100 mA current sinking capability • Bandwidth adjustable from 0 to 14% • High rejection of out of band signals and noise • Immunity to false signals • Highly stable center frequency • Center frequency adjustable from 0.01 Hz to 500 kHz Low Power Tone DecoderLMC567

  5. Modified Microphone and Band Pass FilterCircuit Diagram

  6. Questions…?

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