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university:courses:alm1k:alm-lab-4s [14 Nov 2016 16:46] – add XNOR circuit Doug Merceruniversity:courses:alm1k:alm-lab-4s [03 Nov 2021 20:32] (current) – [Activity: BJT device as a switch] Doug Mercer
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-======Activity 4S: BJT device as a switch======+======Activity: BJT device as a switch, For ADALM1000======
  
 =====Objective:===== =====Objective:=====
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 Calculate the ß when Q<sub>1</sub> is saturated. How does this value compare to the spec listed in the datasheet? Calculate the ß when Q<sub>1</sub> is saturated. How does this value compare to the spec listed in the datasheet?
  
-=====Switches in Parallel:=====+====Switches in Parallel:====
  
-Two NPN transistors can be connected with their collectors and emitters in parallel, figure3, which provides a way to switch on the load from two different signals. Either input can turn on the load but both need to be off for the load to be off. This is referred to as an “OR” function.+Two NPN transistors can be connected with their collectors and emitters in parallel, figure3, which provides a way to switch on the load from two different signals. Either input can turn on the load but both need to be off for the load to be off. This is referred to as an “OR” logic function.
  
 {{ :university:courses:alm1k:alm_lab4s_f3.png?600 |}} {{ :university:courses:alm1k:alm_lab4s_f3.png?600 |}}
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 Again, set PIO 0 and PIO 1 to all four combinations of logic 0 and 1. Note which combinations turn on the LED. The voltage at the LED and Q<sub>5</sub> collector resistor can be monitored with the CH-B scope input as before. You can also use the CH-B ( and / or CH-A ) input to monitor the voltages at the collectors of Q<sub>1</sub> – Q<sub>4</sub> as you change PIO 0 and 1. Again, set PIO 0 and PIO 1 to all four combinations of logic 0 and 1. Note which combinations turn on the LED. The voltage at the LED and Q<sub>5</sub> collector resistor can be monitored with the CH-B scope input as before. You can also use the CH-B ( and / or CH-A ) input to monitor the voltages at the collectors of Q<sub>1</sub> – Q<sub>4</sub> as you change PIO 0 and 1.
 +
 +**Resources:**
 +
 +  * LTSpice files: [[downgit>education_tools/tree/master/m1k/ltspice/bjt_as_switch_ltspice | bjt_as_switch_ltspice ]]
 +  * Fritzing files: [[downgit>education_tools/tree/master/m1k/fritzing/bjt_as_switch_bb | bjt_as_switch_bb]]
  
 **For Further Reading:** **For Further Reading:**
  
-http://en.wikipedia.org/wiki/Transistor\\ +[[wp>Transistor|Transistor]]\\ 
-https://en.wikipedia.org/wiki/Light-emitting_diode\\ +[[wp>Light-emitting_diode|Light- emitting diode]]\\ 
-https://en.wikipedia.org/wiki/LED_circuit+[[wp>LED_circuit|LED circuit]]
  
-**Return to ALM Lab Activity [[university:courses:alm1k:alm-labs-list|Table of Contents]].**+**Return to [[university:labs:intro_ee|Introduction to Electrical Engineering]] Lab Activity Table of Contents**\\ 
 +**Return to [[university:courses:alm1k:alm_circuits_lab_outline|Circuits]] Lab Activity Table of Contents**\\ 
 +**Return to Electronics Lab Activity [[university:courses:alm1k:alm-labs-list|Table of Contents]].**
  
university/courses/alm1k/alm-lab-4s.1479138386.txt.gz · Last modified: 14 Nov 2016 16:46 by Doug Mercer

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