TOUCH ME NOTCriteria & Chosen CircuitCircuitProblems / ChangesFinal Circuit ModelSimulationHuman Body CapacitanceAnalysisOscillatorSlide 10Slide 11Slide 12Slide 13ConclusionUses ModificationsTOUCH ME NOTTOUCH ME NOTTOUCH ACTIVATED SWITCHTOUCH ACTIVATED SWITCHSharon AbrahamSharon Abraham311311Criteria & Chosen CircuitCriteria & Chosen CircuitPossible to build Possible to build Physical CircuitPhysical CircuitParts learnt about in Parts learnt about in classclassSimple enough to Simple enough to model and model and understandunderstandLearn about real Learn about real circuit developmentcircuit developmentGet A in classGet A in classChose Touch Chose Touch Activated SwitchActivated SwitchMeets criteriaMeets criteriaInteresting Interesting conceptsconceptsCircuitCircuitC4470pM1BSS138/FAIV15VdcV25V dcU5A74HC141 214M2BSS138/FAIU5A74HC141 214M1BSS138/FAIV25VdcR647SinkSourceTouch ButtonR4100kR547kR647U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412Problems / ChangesProblems / ChangesCircuit had both Circuit had both source and sinksource and sinkHow to model human How to model human touchtouchRemoved one piece – Removed one piece – used only sinkused only sinkModeled as capacitor Modeled as capacitor and pulse voltage and pulse voltage sourcesourceFinal Circuit ModelFinal Circuit ModelR4100kR547kR6V5TD =TF = 1nPW = .05mPE R = .1mV1 = 0.1TR = 1nV2 = 0U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412C4470pVVM1BSS138/FAIV15VdcV25VdcU5A74HC141 214M2BSS138/FAIV45VdcR1110kC5.1mSimulationSimulation Time0s 20us 40us 60us 80us 100us 120us 140us 160us 180us 200usV(C5:2) V(R6:1)-2.0V0V2.0V4.0V6.0VHuman Body CapacitanceHuman Body CapacitanceR4100kR547kR647V5TD =TF = 1nPW = .05mPER = .1mV1 = 0.1TR = 1nV2 = 0U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412C4470pM1BSS138/FAIV15VdcV25VdcU5A74HC141 214M2BSS138/FAIV45VdcR1110kC5.1mSizable Capacitance ChangeSizable Capacitance ChangeEnvironmental FactorsEnvironmental FactorsAnalysisAnalysisOscillatorOscillator20 kHz20 kHzShmitt TriggersShmitt TriggersRails – Voltage Rails – Voltage sourcessourcesR547kU1A74HC1412R32.2kC20.0022U2A74HC1412U3A74HC1412U4A74HC1412C4470pVOscillatorOscillator Time0s 20us 40us 60us 80us 100us 120us 140us 160us 180us 200usV(R5:1)-4.0V0V4.0V8.0VHigh ResistanceHigh ResistanceZero CurrentZero CurrentR4100kR547kR647V5TD =TF = 1nPW = .05mPER = .1mV1 = 0.0TR = 1nV2 = 0U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412C4470pM1BSS138/FAIV15V dcV25VdcU5A74HC141 214M2BSS138/FA IV45VdcR1110kC51fR4100kR547kR647V5TD =TF = 1nPW = .05mPER = .1mV1 = 0.0TR = 1nV2 = 0U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412C4470pM1BSS138/FAIV15V dcV25VdcU5A74HC141 214M2BSS138/FA IV45VdcR1110kC51fTransistor – Transistor – Diode – Only positive voltageDiode – Only positive voltageAmplifies SignalAmplifies SignalR4100kR547kR647V5TD =TF = 1nPW = .05mPER = .1mV1 = 0.0TR = 1nV2 = 0U1A74HC1412R7100KSET = 0.5R115kR2470kR32.2kR847kQ1Q2N2907AD1D1N4148C1.1C20.0022C30.1U2A74HC1412U3A74HC1412U4A74HC1412C4470pM1BSS138/FAIV15V dcV25VdcU5A74HC141 214M2BSS138/FA IV45VdcR1110kC51fTime0s 20us 40us 60us 80us 100us 120us 140us 160us 180us 200usV(R6:2) V(C3:1) V(C1:2)-5V0V5V10VConclusionConclusionCircuit works as was expectedCircuit works as was expectedUses ModificationsUses ModificationsElevator buttonsElevator buttonsPool sensorPool sensorTouch activated lampTouch activated lamp- Addition of Flip Flops- Addition of Flip FlopsAlarm SystemAlarm System- Output load is a siren- Output load is a
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