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university:courses:electronics:comms-lab-peltz-osc [27 Mar 2017 17:13] – [Directions:] Doug Merceruniversity:courses:electronics:comms-lab-peltz-osc [05 Jan 2018 03:35] – Trecia Agoylo
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 Set both scope inputs to 200 mV/div and the time base to 1 uSec/div. Set the trigger on the rising edge of channel 1. Set both scope inputs to 200 mV/div and the time base to 1 uSec/div. Set the trigger on the rising edge of channel 1.
 +{{ :university:courses:electronics:apltz_bb.png? |}}
 +
 +<WRAP centeralign> Figure 4 Peltz oscillator circuit breadboard connections </WRAP>
  
 =====Procedure:===== =====Procedure:=====
  
 Turn on the -5V power supply. Observe the output waveform across the LC tank on scope channel 1. You can also observe the waveform seen at the emitters of Q<sub>1</sub> and Q<sub>2</sub> using scope channel 2.  Turn on the -5V power supply. Observe the output waveform across the LC tank on scope channel 1. You can also observe the waveform seen at the emitters of Q<sub>1</sub> and Q<sub>2</sub> using scope channel 2. 
 +{{ :university:courses:electronics:apltz_scopyshot.png? |}}
 +
 +<WRAP centeralign> Figure 5 Peltz oscillator circuit Scopy shot </WRAP>
  
 Notice that the output signal swings positive and negative around ground (0 V). Measure the frequency of the output waveform. Measure the peak to peak amplitude R<sub>2</sub> and R<sub>3</sub> replaced with shorts (i.e. 0 Ω). Compare this to the peak to peak amplitude you measure with R<sub>2</sub> and R<sub>3</sub> in the circuit. Try other values for R<sub>2</sub> and R<sub>3</sub>. Is there a practical upper limit to the values of R<sub>2</sub> and R<sub>3</sub> and the peak to peak amplitude? Does changing the value of R<sub>2</sub> and R<sub>3</sub> effect the oscillating frequency? If so why? Notice that the output signal swings positive and negative around ground (0 V). Measure the frequency of the output waveform. Measure the peak to peak amplitude R<sub>2</sub> and R<sub>3</sub> replaced with shorts (i.e. 0 Ω). Compare this to the peak to peak amplitude you measure with R<sub>2</sub> and R<sub>3</sub> in the circuit. Try other values for R<sub>2</sub> and R<sub>3</sub>. Is there a practical upper limit to the values of R<sub>2</sub> and R<sub>3</sub> and the peak to peak amplitude? Does changing the value of R<sub>2</sub> and R<sub>3</sub> effect the oscillating frequency? If so why?
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 **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]].** **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]].**
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university/courses/electronics/comms-lab-peltz-osc.txt · Last modified: 25 Jun 2020 22:07 by 127.0.0.1

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