Physlock – an entry level lockin amplifier board | PhysLab

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Physlock - an entry level lockin amplifier board

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Researchers Sultan Abdul Wadood
Time Frame Physics Project Lab 2019
Supplementary Materials Physlock – Technical Report
User Manual: Using PhysLock with a chopped optical beam
Description

 

 

 

 

 

 

 

The design of a simple, entry-level low-cost, stand-alone lock-in amplifier is described. The instrument is useful for detecting and amplifying signals that are frequency synchronized with a reference signal. It is particularly important for detecting and measuring small signals in the presence of large noise. The design is based on a modulator/demodulator integrated circuit and uses a minimum number of components to accomplish input amplification, phase-sensitive detection, low-pass filtering, and dc amplification of the output signal.

Physlock is based on the integrated circuit AD630 and will be helpful in teaching students about low-level signal detection which is commonplace in numerous tasks in the experimental physics laboratory. It can also be used in the research laboratory (see specs below).

  • Power 220 V, 50 Hz
  • Reference signal amplitude > 1 V
  • Dynamic Range 60 dB to 70 dB
  • DC gains 1x or 10x
  • AC input gains 1x, 50x, 100x, 500x, 1000x, 2000x, 5000x
  • Low pass filter time constants 1 s, 0.1 s, 10 ms, 0.1 ms, 10 us
  • Form of input signal Low frequency (< 1 kHz) periodic signal
    (square to sine converter is also provided).

The complete circuit diagram is given below. You are welcome to build this on your own.

Student details: Sultan Abdul Wadood (Final Year Project at EME, NUST)

Designed by Muhammad Shafique (Qosain Scientific) and Dr. Sabieh Anwar.

Testing and documentation by Shiraz Ahmad (MS Physics Student, LUMS)

 


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  • Home
  • About Us
    • Overview
    • Centre for Experimental Physics Education (CEPE)
    • Physlab Team
    • Physlab Guidebook
    • Alumni
    • Open Positions
    • Muhammad Sabieh Anwar (Personal)
  • Academics
    • Lab Courses
    • Lab-I (PHY 100/200)
    • Lab-II (PHY 300/500)
    • AstroLAB
    • Ibn Sahl Corner for Optics
    • Fast Optics
    • Smart Physics
    • Single Photon Quantum Mechanics Lab
    • Chasing Cosmic Ray Muons at Physlab
    • Stories
    • Physics Studio
    • Research Stories
    • Class Activities
    • Courses Taught
    • Class Demonstrations
    • PhysDiary
    • Health and Safety
    • Lab Safety
    • Workplace Organization
  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open House
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
    • Forms
    • Equipment Howto’s
  • Media
    • Videobytes
    • YouTube Channel
    • Visitors
    • Testimonials
  • Contact Us