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university:courses:electronics:comms-lab-hartley-osc [24 Jan 2015 20:32] – [Materials:] Doug Merceruniversity:courses:electronics:comms-lab-hartley-osc [25 Jun 2020 22:07] (current) – external edit 127.0.0.1
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 =====Materials:===== =====Materials:=====
- +ADALM2000 Active Learning Module\\
-Analog Discovery Lab hardware\\+
 Solder-less breadboard, and jumper wire kit\\ Solder-less breadboard, and jumper wire kit\\
 1 - 2N3904 NPN transistor\\ 1 - 2N3904 NPN transistor\\
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 =====Hardware Setup:===== =====Hardware Setup:=====
  
-The green squares indicate where to connect the Discovery module AWG, scope channels and power supplies. Be sure to only turn on the power supplies after you double check your wiring.+The green squares indicate where to connect the ADALM2000 module AWG, scope channels and power supplies. Be sure to only turn on the power supplies after you double check your wiring. 
 + 
 +<WRAP centeralign>{{ :university:courses:electronics:hartley_osc-bb.png |}}</WRAP> 
 + 
 +<WRAP centeralign> Figure 3 Hartley Oscillator breadboard circuit </WRAP>
  
 =====Procedure:===== =====Procedure:=====
  
 Having finished construction the Hartley oscillator check that the circuit is oscillating correctly by turning on both the + and - 5 V power supplies and connecting one of the oscilloscope channels to the output terminal. It may be found that the value of R<sub>3</sub> is fairly critical, producing either a large distorted waveform or an intermittent low or no output. To find the best value for R<sub>3</sub>, it could be replaced by a 1 KΩ potentiometer for experimentation to find the value that gives the best wave shape and reliable amplitude. Having finished construction the Hartley oscillator check that the circuit is oscillating correctly by turning on both the + and - 5 V power supplies and connecting one of the oscilloscope channels to the output terminal. It may be found that the value of R<sub>3</sub> is fairly critical, producing either a large distorted waveform or an intermittent low or no output. To find the best value for R<sub>3</sub>, it could be replaced by a 1 KΩ potentiometer for experimentation to find the value that gives the best wave shape and reliable amplitude.
 +
 +A plot example using R<sub>1</sub> = 10KΩ, R<sub>2</sub> = 1KΩ, R<sub>3</sub> = 100Ω and C<sub>1</sub> = 4.7nF is presented in the figure below.
 +
 +<WRAP centeralign>{{ :university:courses:electronics:hartley_osc-wav.png |}}</WRAP>
 +
 +<WRAP centeralign> Figure 4 Hartley Oscillator plot </WRAP>
  
 =====Questions:===== =====Questions:=====
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 |4.7nF|  |  | |4.7nF|  |  |
 |10nF|  |  | |10nF|  |  |
 +
 +<WRAP round download>
 +**Lab Resources:**
 +  * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/hartley_osc_bb | hartley_osc_bb]]
 +  * LTspice files: [[downgit>education_tools/tree/master/m2k/ltspice/hartley_osc_ltspice | hartley_osc_ltspice]]
 +</WRAP>
  
 **For Further Reading:** **For Further Reading:**
university/courses/electronics/comms-lab-hartley-osc.1422127923.txt.gz · Last modified: 24 Jan 2015 20:32 by Doug Mercer

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