EngineersGarage

  • Engineers Garage Main Site
  • Visit our active EE Forums
    • EDABoard.com
    • Electro-Tech-Online
  • Projects & Tutorials
    • Circuits
    • Electronic Projects
    • Tutorials
    • Components
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
You are here: Home / Topics / dmm

dmm

|

Electronics › Electronics › dmm

  • This topic has 6 replies, 3 voices, and was last updated 10 years, 7 months ago by ZOBI.
Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • October 19, 2011 at 6:35 pm #1329
    ayesha siddique
    Participant

    i have to make a digital multi meter.i am in 5th semister.i dont know how to builad its circuit and how to programm it.plz help me???

    November 22, 2011 at 1:15 pm #6864
    arun
    Participant

    yes i can help u…….. to construct dmm but first u decide whether u need to use programed or descrite one..

    November 23, 2011 at 5:46 pm #6871
    ayesha siddique
    Participant

    i dont need programmed dmm…..i need the discrete one…..

     

    November 23, 2011 at 5:46 pm #6872
    ayesha siddique
    Participant

    i dont need programmed dmm…..i need the discrete one…..

     

    December 27, 2011 at 8:18 am #6944
    ZOBI
    Participant

    This circuit is a circuit diagram  digital voltmeter with LED display. It’s ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA. The use of 7805 5V voltage regulator is highly recommended to prevent the damage of ICL7107, 555 ICs and to extend the operating voltages. The following is a schematic drawing:

     
     

    Parts list of The Digital LED Voltmeter:

    R1 = 8K2 R1 = 8K2
    R2 = 47K / 470K R2 = 47k / 470K
    R3 = 100K R3 = 100K
    R4 = 2K R4 = 2K
    R5, R6 = 47K R5, R6 = 47k
    R7 = 0R / 4K7 R7 = 0R / 4K7
    R8 = 560R R8 = 560R
    C1,C5, C6, C8, C9 = 100n C1, C5, C6, C8, C9 = 100n
    C2 = 470n / 47n C2 = 470n / 47n
    C3 = 220n C3 = 220n
    C4 = 100p C4 = 100p
    C7 = 10-22u C7 = 10-22U
    D1, D2 = 1N4148 D1, D2 = 1N4148
    IC1 = ICL7107 IC1 = ICL7107
    IC2 = NE555 IC2 = NE555
    OPTO = CA 10 pin FTA = CA 10 pin

     

    December 27, 2011 at 8:22 am #6946
    ZOBI
    Participant

    try this link also

     

    http://www.electronics-lab.com/projects/test/001/index.html

    December 27, 2011 at 8:23 am #6947
    ZOBI
    Participant