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university:courses:electronics:electronics-lab-24 [24 Jul 2017 16:12] – change amplitude value to peak-peak Antoniu Miclausuniversity:courses:electronics:electronics-lab-24 [24 Nov 2017 08:12] – Uploaded Monostable and Bistable scopeshot Dann Kristofer Bautista
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 Turn on the Vp power supply only after you have completely built and checked the circuit. The red and green LEDs should alternately blink on and off at about a 1 second interval. You can also use the scope channels to monitor the output waveforms (Q and Qbar). Turn on the Vp power supply only after you have completely built and checked the circuit. The red and green LEDs should alternately blink on and off at about a 1 second interval. You can also use the scope channels to monitor the output waveforms (Q and Qbar).
 +\\ \\ 
 +{{ :university:courses:electronics:bjtmultivibrators_astable_hardware_setup.png |}} \\ 
 +<WRAP centeralign> Figure 2, Astable Multivibrator Breadboard Circuit</WRAP> 
 +\\
 The frequency of oscillation is very slow due to the large values of capacitors C<sub>1</sub> and C<sub>2</sub>. Replace C<sub>1</sub> and C<sub>2</sub> with 0.1uF capacitors. The circuit should oscillate much faster now such that both LEDs seem to be on at the same time. Using the scope channels you should now measure the frequency and period of the output waveforms. The frequency of oscillation is very slow due to the large values of capacitors C<sub>1</sub> and C<sub>2</sub>. Replace C<sub>1</sub> and C<sub>2</sub> with 0.1uF capacitors. The circuit should oscillate much faster now such that both LEDs seem to be on at the same time. Using the scope channels you should now measure the frequency and period of the output waveforms.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_astable_scopeshot_1second_interval.png |}} 
 +<WRAP centeralign> Figure 3, Astable Multivibrator interval at 47uF capacitor </WRAP>
 +{{ :university:courses:electronics:bjtmultivibrators_astable_scopeshot_0.1ufcap.png |}} 
 +<WRAP centeralign> Figure 4, Astable Multivibrator interval at 0.1uF capacitor </WRAP>
  
 ===== Questions: ===== ===== Questions: =====
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 {{ :university:courses:electronics:a24_f2.png?500 |}} {{ :university:courses:electronics:a24_f2.png?500 |}}
  
-<WRAP centeralign> Figure 2, Monostable Multivibrator </WRAP>+<WRAP centeralign> Figure 5, Monostable Multivibrator </WRAP> \\ 
 + 
 +{{ :university:courses:electronics:bjtmultivibrators_monostable_hardware_setup.png |}} \\ 
 +<WRAP centeralign> Figure 6, Monostable Multivibrator Breadboard Circuit</WRAP> \\
  
 ===== Procedure: ===== ===== Procedure: =====
  
 Turn on the Vp power supply only after you have completely built and checked the circuit. The red LED should be lit and the green LED should be dark. With a length of wire, momentarily touch the trigger input (end of R<sub>5</sub>) to Vp and immediately let go. The red LED should go out and the green LED come on for about a second and then go back to the stable state with the red on and green off. Try this a few times. Turn on the Vp power supply only after you have completely built and checked the circuit. The red LED should be lit and the green LED should be dark. With a length of wire, momentarily touch the trigger input (end of R<sub>5</sub>) to Vp and immediately let go. The red LED should go out and the green LED come on for about a second and then go back to the stable state with the red on and green off. Try this a few times.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_monostable_scopeshot.png |}}
 +<WRAP centeralign> Figure 6, Monostable Multivibrator Behavior on trigger</WRAP> \\
 +
  
 ===== Questions: ===== ===== Questions: =====
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 Add questions here: Add questions here:
  
-====== The BIstable Multivibrator ( or flip-flop ) ======+====== The Bistable Multivibrator ( or flip-flop ) ======
  
 ===== Objectives: ===== ===== Objectives: =====
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 {{ :university:courses:electronics:a24_f3.png?600 |}} {{ :university:courses:electronics:a24_f3.png?600 |}}
  
-<WRAP centeralign> Figure 3, Bistable Multivibrator </WRAP>+<WRAP centeralign> Figure 7, Bistable Multivibrator </WRAP> 
 + 
 +{{ :university:courses:electronics:bjtmultivibrators_bistable_hardware_setup.png |}} 
 + 
 +<WRAP centeralign> Figure 8, Bistable Multivibrator Breadboard Circuit </WRAP>
  
 ===== Procedure: ===== ===== Procedure: =====
  
 Turn on the Vp power supply only after you have completely built and checked the circuit. Either the red LED should be lit with the green LED dark or the green LED should be lit with the red LED dark. With a length of wire, momentarily touch the either the SET or RESET input (end of R<sub>5</sub> or R<sub>6</sub>) to Vp and immediately let go. The LEDs should change state or toggle back and forth depending which input is touched to Vp. Try this a few times. Turn on the Vp power supply only after you have completely built and checked the circuit. Either the red LED should be lit with the green LED dark or the green LED should be lit with the red LED dark. With a length of wire, momentarily touch the either the SET or RESET input (end of R<sub>5</sub> or R<sub>6</sub>) to Vp and immediately let go. The LEDs should change state or toggle back and forth depending which input is touched to Vp. Try this a few times.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_bistable_scopeshot1.png |}}
 +<WRAP centeralign> Figure 9, Bistable Multivibrator behavior triggering Set pin </WRAP>
 +
 +{{ :university:courses:electronics:bjtmultivibrators_bistable_scopeshot2.png |}}
 +<WRAP centeralign> Figure 10, Bistable Multivibrator behavior triggering Reset pin </WRAP>
  
 Connect the SET and RESET inputs to two of the digital I/O pins on the ADALM2000 connector. Configure  Connect the SET and RESET inputs to two of the digital I/O pins on the ADALM2000 connector. Configure 
 the pins as push-pull outputs. Used the static digital I/O screen to control the digital pins. the pins as push-pull outputs. Used the static digital I/O screen to control the digital pins.
 +
 +
 ===== Questions: ===== ===== Questions: =====
  
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 {{ :university:courses:electronics:a24_f4.png?600 |}} {{ :university:courses:electronics:a24_f4.png?600 |}}
  
-<WRAP centeralign> Figure 4 D type flip-flop </WRAP>+<WRAP centeralign> Figure 11 D type flip-flop </WRAP>
  
 ====Hardware setup:==== ====Hardware setup:====
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 swing ). Set the frequency of AWG1 to 10 KHz and set the frequency of AWG2 to 5 KHz. Set the phase of  swing ). Set the frequency of AWG1 to 10 KHz and set the frequency of AWG2 to 5 KHz. Set the phase of 
 AWG2 to 45 degrees. Be sure to configure the two AWG outputs to operate synchronously.  AWG2 to 45 degrees. Be sure to configure the two AWG outputs to operate synchronously. 
 +\\
 +{{ :university:courses:electronics:bjtmultivibrators_dflipflop_hardware_setup.png |}}
 +<WRAP centeralign> Figure 12 D type flip-flop breadboard circuit</WRAP>
  
 ====Procedure:==== ====Procedure:====
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 should see a similar square wave signal but ahead in time with respect to the Q output. In other words  should see a similar square wave signal but ahead in time with respect to the Q output. In other words 
 the Q output is delayed until the falling edge of the Clock signal. the Q output is delayed until the falling edge of the Clock signal.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_dflipflop_scopeshot1.png |}}
 +<WRAP centeralign> Figure 13: Plot of Q and Clock signal </WRAP>
 +{{ :university:courses:electronics:bjtmultivibrators_dflipflop_scopeshot2.png |}}
 +<WRAP centeralign> Figure 14: Plot of Q and D signal </WRAP>
  
 ====Questions:==== ====Questions:====
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 {{ :university:courses:electronics:a24_f5.png?600 |}} {{ :university:courses:electronics:a24_f5.png?600 |}}
  
-<WRAP centeralign> Figure 5 Divide by 2 circuit </WRAP>+<WRAP centeralign> Figure 15 Divide by 2 circuit </WRAP>
  
 ====Hardware setup:==== ====Hardware setup:====
  
 The AWG1 output and scope channel 1 input should both be connected to the input marked Clock in figure  The AWG1 output and scope channel 1 input should both be connected to the input marked Clock in figure 
-5. The second input scope channel 2 should be connected to the Q output of the flip-flop in figure 5. +13. The second input scope channel 2 should be connected to the Q output of the flip-flop in figure 5. 
 The AWG1 should be configured as a square wave with a 5 V amplitude and 2.5 V offset ( 0 - 5V swing ).  The AWG1 should be configured as a square wave with a 5 V amplitude and 2.5 V offset ( 0 - 5V swing ). 
 Set the frequency to 10 KHz. Set the frequency to 10 KHz.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_divide_by_2_flipflop_hardware_setup.png |}}
 +
 +<WRAP centeralign> Figure 16 Divide by 2 flipflop breadboard circuit</WRAP>
  
 ====Procedure:==== ====Procedure:====
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 signal. Move the channel 2 scope input to the QB output. You should see a similar square wave signal but  signal. Move the channel 2 scope input to the QB output. You should see a similar square wave signal but 
 inverted with respect to the Q output. inverted with respect to the Q output.
 +
 +{{ :university:courses:electronics:bjtmultivibrators_divide_by_2_flipflop_scopeshot1.png |}}
 +<WRAP centeralign> Figure 15: Plot of Clock and Q output</WRAP>
 +
 +{{ :university:courses:electronics:bjtmultivibrators_divide_by_2_flipflop_scopeshot2.png |}}
 +<WRAP centeralign> Figure 16: Plot of Clock and QB output</WRAP>
  
 ====Questions:==== ====Questions:====
university/courses/electronics/electronics-lab-24.txt · Last modified: 03 Nov 2021 20:43 by Doug Mercer

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