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thunder

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Posts posted by thunder

  3. 4 bit binary counter

    in Electronic Projects Design/Ideas

    Posted

    hi there,
    here i've a binary counter whichs connections are shown in attachment , plz check if there is any thing wrong with it. it's no is :74193  4 bits programmable binary counter
    its clock signal is from shaft encoder the problem is not counting at all or count like this:13579  .  the shaft encoder is giving pulse correctly, 

    post-4373-14279142910855_thumb.jpg

  4. Shaft encoder

    in Electronic Projects Design/Ideas

    Posted

    Hello all
    i sent asking about how to make my counter works properly
    well
    now the matter became so horrible
    i'll tell u what i did & need anyone to tell me comment & guide me coz this is my first practical work, im working lonely too, no team
    plz dont laugh at me

    i got an optocoupler & biased it , im sure of it's connection & it gives output pulses when the motor disc rotates btween it's both sides (photo diode & receiving transistor
    the motor disc is simply a piece of strong paper that i made in form of circle & made it's edge like a gear ( i made 16 holes on the circumference)

    output pulses from opto coupler i use it as the clock , input to my counter
    the counter 74193 , i connected it as follows:
    it's four input pins-----to ground
    pin 16---vcc
    pin8--- ground
    load pin---vcc through 1kohm
    clear pin-- to ground
    i connected the four output pins to leds inorder to check the count

    well,, im supposed to connect the carry pin to a second counter 74193 as a clock, so that each 16 pulse (each motor cycle) the second counter will count 1,,, & then i'll connect it to a decoder 7447 & seven segment

    now i connected the whole circuit except the second counter
    i thought of checking what i did first, b4 i continue

    i connected the 1st counter directly to the decoder 7447
    but hoplessly it didnt count at all
    when i wasnt connecting the decoder, it was counting but stupidly
    1 5 7 1 5 7
    i connected a capacitor as the degnified sir told me, but still stupid count
    it's awful in both cases
    i dont know what to do!!!!!!!!!!

    plz help meeeeeeeeeeeeeeeeeeeeee

    im so sorry for making it long on u

    waiting ur replies

    bye



    MODERATOR EDIT:  I have moved this post to it's own topic for more exposure. Good luck Thunder  -MP

  5. PCB Design

    in Spice Simulation - PCB design

    Posted

    Hello all
    can anyone teach me how to use the program Eagle to make a design on a board??
    im saying eagle coz this is the program i have
    but if anyone else of u have any other program for PCB design & can send it to me & teach me how to use it, i'd b really very grateful
    & thank u all
    this is my email, plz send me
    [email protected]
    salam alykom
    bye

  8. hot air gun

    in Mechanical constructions/Hardware

    Posted

    i've bought a hot air gun mashin '"i don't know really wut terminolgy is used for dis mashin but i name it hot gun'' 4 desolding smd chips but i don't know how to use it  , it has 2 variable controles one is for air pressure and d other is 4 heater
    so any one can help me abt dat wut tempreture and air pressure is normally used and there is othere tools like penses N paste plz give me information abt dat

  10. tape recorder

    in Service Manuals

    Posted

    a tabe recorder which works on 120vac has been connected to 220vac when i checked it just the fuse was blown and the transformer was ok.but when i changed the fuse its on standby and do not be on  plz tell me where should i check. in wut may be the problem?

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