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TOUCH ME NOT

TOUCH ME NOT. TOUCH ACTIVATED SWITCH Sharon Abraham 311. Possible to build Physical Circuit Parts learnt about in class Simple enough to model and understand Learn about real circuit development Get A in class. Chose Touch Activated Switch Meets criteria Interesting concepts.

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TOUCH ME NOT

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  1. TOUCH ME NOT TOUCH ACTIVATED SWITCH Sharon Abraham 311

  2. Possible to build Physical Circuit Parts learnt about in class Simple enough to model and understand Learn about real circuit development Get A in class Chose Touch Activated Switch Meets criteria Interesting concepts Criteria & Chosen Circuit

  3. Circuit

  4. Circuit had both source and sink How to model human touch Removed one piece – used only sink Modeled as capacitor and pulse voltage source Problems / Changes

  5. Final Circuit Model

  6. Simulation

  7. Human Body Capacitance • Sizable Capacitance Change • Environmental Factors

  8. Oscillator 20 kHz Shmitt Triggers Rails – Voltage sources Analysis

  9. Oscillator

  10. High Resistance • Zero Current

  11. Transistor – • Diode – Only positive voltage

  12. Amplifies Signal

  13. Conclusion • Circuit works as was expected

  14. Elevator buttons Pool sensor Touch activated lamp - Addition of Flip Flops Alarm System - Output load is a siren Uses Modifications

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