my rc car

Discussion in 'General Electronics Chat' started by jimit, Aug 9, 2011.

  1. jimit

    Thread Starter Member

    Oct 28, 2010
    57
    0
    hie every one i have made an rc car but am having some problems with the relays used in it they consume most of the power of my car is there any alternatives to the relays ????????? i cant use the h bridge configuration i need some thing like a relay but which consumes less power plz help i have to submit it as soon as possible
    plz help
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    2,936
    488
    Can you post a circuit diagram? Why can't you use MOSFET's etc.?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Typically, relays are very power-hungry, as the coils need to be energized to close the N.O. contacts. It's easy to create an electromechanical H-bridge with a couple of SPDT relays. If you want something more efficient, you will have to go with an H-bridge configuration.

    Check out Steve Bolts' 4-transistor H-bridge on BEAM circuits:
    http://www.solarbotics.net/library/circuits/driver_4varHbridge.html
    Needs a Vcc of 4.5v to 6v, uses 2 inverters from a 74HC14 IC.
     
  4. jimit

    Thread Starter Member

    Oct 28, 2010
    57
    0
    here is the pdf version if the circuit and the part list
    i have not uploaded the relay configuration but plz try to figure out something i am just a bigner need help as soon as possible
    thx in advance hope you will help

    if you find some thing help full then try to explain me in detail i am very dum in electronic
    plz a request :(
     
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  5. jimit

    Thread Starter Member

    Oct 28, 2010
    57
    0
    i forgot to tell that i am using four 12v 250 rpm geared motors
    and here is the relay configuration and some other pic
     
  6. jimit

    Thread Starter Member

    Oct 28, 2010
    57
    0
    i at least got it working but it sticks a little bit when i put it in the momentary mode such as when i change the directions the relay turn on n off rapidly for few seconds and then work fine
    plz help
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You probably do not have large enough capacitors on the board that is controlling the relays.
     
  8. jimit

    Thread Starter Member

    Oct 28, 2010
    57
    0
    sry sir but i didnt get you
    means do i need more capacitors or are there any capacitors
    and if i need so then which type of capacitors and of what value ?????????
     
  9. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
    2,831
    89
    See, while connecting a good load just like your DC motor you should use big capacitors like 4,000uf above 40V.
    there is no dump rule to calculate it value, use any if you don't have such capacitor try to fix them in //.
     
  10. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
    2,831
    89
    You are using a Ready made wirelesss switch....try to use HT 12E/D for that with Rx and Tx 433,etc Mhz.
     
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