capacitor charging circuit

Discussion in 'General Electronics Chat' started by salty58, Oct 12, 2012.

  1. salty58

    Thread Starter New Member

    Dec 6, 2009
    i have a toy electric motor running of 2AA batteries ,ive comeup with the idea of replacing the batteries with a capacitor charging circuit from a disposable camera ,however the capacitor in the camera board is rated at 330v,180 micro can i reduce the voltage from the capacitor 330v to3v ,is it possiable to control the rate of discharge of a capacitor so it gradually discharges its power to the motor
  2. pwdixon

    Active Member

    Oct 11, 2012
    It's not the rating on the capacitor that matters it's the voltage it's charged to. What's charging this capacitor? Charge with 3V and it will only reach 3V. The problem will be how much charge the capacitor will hold and therefore how long the toy will run for. you need to do some calculations on the current required and hence charge. Unfortunately this usually means that the actual capacitor value needs to be ridiculously high to get any usable run time.
  3. electron_prince

    Active Member

    Sep 19, 2012
    capacitor and battery are completely different thing. capacitor is not a rechargeable battery. More is the capacitance, slowly it will charge and slowly discharge.

    as you can read in the previous post, the voltage across fully charged capacitor is equal to that of the source charging it. Remember small capacitors may get damaged if you want to charge it to very high potential.