capacitor charging circuit

Thread Starter

salty58

Joined Dec 6, 2009
2
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 farad.how 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
 

pwdixon

Joined Oct 11, 2012
488
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.
 
capacitor and battery are completely different thing. capacitor is not a rechargeable battery. More is the capacitance, slowly it will charge and slowly discharge.

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
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.
 
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