# keep the load on in the capacitor charge discharge circuit

Discussion in 'General Electronics Chat' started by d_c_robo, Dec 12, 2014.

1. ### d_c_robo Thread Starter New Member

Dec 12, 2014
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hello friends

i am new on this forum and would like to ask a question on one of my projects.

1. i have a continuous power source which gives me a voltage of about 6 V and some mA current good enough to light a bunch of LED's which can give light and charge mobile batteries.
2. since I have a continuous power source i have to also use this power to be stored in a capacitor and discharge continuously for charging and discharging mobile batteries.
3. can anyone give me an idea how to built a circuit for this example.

2. ### MikeML AAC Fanatic!

Oct 2, 2009
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What is the source of the continuous power?

Where is the charging regulator? Inside the phone, or are you attempting to build one external to the phone?

3. ### d_c_robo Thread Starter New Member

Dec 12, 2014
3
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hi

source of continuous power is a normal rectifier circuit which gives dc output of 6 v

i need to build a charging discharging circuit based on a timer so that i can plug on and plug off the battery for charging it..

4. ### MikeML AAC Fanatic!

Oct 2, 2009
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You didn't answer my question. Are you trying to build a charger that charges cell phone batteries where the battery is removed from the cell phone? If so, this is a very complicated project, much beyond the capabilities of a beginner.

If you are trying to supply DC to the cell phone, where the cell phone battery is inside the cell phone, then this is a more doable project...

5. ### d_c_robo Thread Starter New Member

Dec 12, 2014
3
0

i have to charge a battery and also store the energy in the capacitor or a battery which i can later use.

6. ### MikeML AAC Fanatic!

Oct 2, 2009
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Storing energy in a capacitor for later use is not practical because the voltage drops linearly as the charge is used. You need a secondary battery, such as a 6V Sealed Lead Acid rechargeable battery:

Such a battery has a very flat voltage vs discharge curve. In other words, the voltage is almost constant as the battery discharges...

Now you need an AC-line powered "charger" for the 6V SLA. It is much easier to build a charger for a SLA battery compared to other battery chemistries...