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university:courses:electronics:electronics-lab-10 [14 Dec 2012 21:27]
Doug Mercer [Using an NPN transistor array:]
university:courses:electronics:electronics-lab-10 [25 Jun 2020 22:07] (current)
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-====== Activity ​10. Shunt regulator ======+====== ActivityShunt regulator ======
  
 ===== Objective: ===== ===== Objective: =====
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 ===== Materials: ===== ===== Materials: =====
-Analog Discovery Lab hardware\\+ADALM2000 Active Learning Module\\
 Solder-less breadboard\\ Solder-less breadboard\\
 Jumper wires\\ Jumper wires\\
Line 25: Line 25:
 ===== Hardware Setup: ===== ===== Hardware Setup: =====
  
-Waveform generator W1 should be configured for a 1 KHz triangle wave with volt amplitude and 2V offset. The Single ended input of scope channel 2 (2+) is used to measure the regulated output voltage at the collector of Q<​sub>​3</​sub>​.+{{:​university:​courses:​electronics:​bandgap_sh_reg-bb.png|}} 
 + 
 +<WRAP centeralign>​ Figure 2 Band-gap shunt regulator Breadboard Circuit </​WRAP>​ 
 + 
 +Waveform generator W1 should be configured for a 1 KHz triangle wave with volt amplitude ​peak-to-peak ​and 2V offset. The Single ended input of scope channel 2 (2+) is used to measure the regulated output voltage at the collector of Q<​sub>​3</​sub>​.
  
 ===== Procedure: ===== ===== Procedure: =====
  
 The regulated output voltage should be observed as the variable resistor R<​sub>​3</​sub>​ is adjusted. The regulated output voltage should be observed as the variable resistor R<​sub>​3</​sub>​ is adjusted.
 +
 +<WRAP centeralign>​{{:​university:​courses:​electronics:​bandgap_sh_reg-wav.png?​500|}}</​WRAP>​
 +
 +<WRAP centeralign>​ Figure 3 output voltage vs. input voltage ​ </​WRAP>​
  
 {{ :​university:​courses:​electronics:​a10_f2.png?​500 |}} {{ :​university:​courses:​electronics:​a10_f2.png?​500 |}}
  
-<WRAP centeralign>​ Figure ​output voltage vs. input current </​WRAP>​+<WRAP centeralign>​ Figure ​output voltage vs. input current </​WRAP>​
  
 =====Questions:​ ===== =====Questions:​ =====
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 All the emitters can be tired to ground ( pins 3,7,10,13 ). Devices Q<​sub>​1</​sub>,​ Q<​sub>​2</​sub>​ and Q<​sub>​3</​sub>​ can be connected in parallel and serve as Q<​sub>​2</​sub>​ in figure 1. Q<​sub>​4</​sub>​ and Q<​sub>​5</​sub>​ can be used for Q<​sub>​1</​sub>​ and Q<​sub>​3</​sub>​ in figure 2. The 3 to 1 emitter area ratio will result in an output voltage very nearly 1.2 volts if R<​sub>​1</​sub>​ and R<​sub>​3</​sub>​ are both equal to 2KΩ. All the emitters can be tired to ground ( pins 3,7,10,13 ). Devices Q<​sub>​1</​sub>,​ Q<​sub>​2</​sub>​ and Q<​sub>​3</​sub>​ can be connected in parallel and serve as Q<​sub>​2</​sub>​ in figure 1. Q<​sub>​4</​sub>​ and Q<​sub>​5</​sub>​ can be used for Q<​sub>​1</​sub>​ and Q<​sub>​3</​sub>​ in figure 2. The 3 to 1 emitter area ratio will result in an output voltage very nearly 1.2 volts if R<​sub>​1</​sub>​ and R<​sub>​3</​sub>​ are both equal to 2KΩ.
 +
 +<WRAP round download>​
 +**Resources:​**
 +  * Fritzing files: [[downgit>​education_tools/​tree/​master/​m2k/​fritzing/​shunt_volt_reg_bb | shunt_reg_bb]]
 +  * LTSpice files: [[downgit>​education_tools/​tree/​master/​m2k/​ltspice/​shunt_reg_ltspice | shunt_reg_ltspice]]
 +</​WRAP>​
  
 **Return to Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]** **Return to Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]**
  
university/courses/electronics/electronics-lab-10.1355516858.txt.gz · Last modified: 14 Dec 2012 21:27 by Doug Mercer