Sorry, I was going to post the circuit and the data. But I spent more time than I thought.
Basically, I want to light a little 12V light bulb. The common connection would be to connect the bulb directly to the power source. But in this case, I want to light it using the energy stored in a capacitor.
In the first operation, the power source is connected to the capacitor while the bulb is not conected to the capacitor.
Then, the capacitor is disconnected from the power source and then the light bulb is connected to the capacitor. The operation is repeated again and again.
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The circuit only represents the intention, I mean that the final circuit will be switched automatically, using transistors and probrarly a IC 555.
I don't know the value of the cap. But I think it need to be around 20Volts, non polarized. I don't know the uF.
For those that say that It's not possible to light an incasdescent light bulb with a single capacitor charge, here is the evidence that it's possible.
Check around 5:20
https://www.youtube.com/watch?v=wRWwFxNZZxc&feature=related
The capacitor is 200 Volts, 330 uF.
Here you have a simple (incomplete and non-finished) schematic of what I mean.
The transistor of the left side allows to flow current to charge the capacitor. When the capacitor is charged up to 12 Volts (because the light bulb is 12 Volts), then the transistor of the right allows to flow electricity from the capacitor to the light bulb, while the capacitor is not connected to the main power source.
Maybe I would need to used a PNP and a NPN transistor. When the 555 pin 3, sends a positive pulse then the NPN transistor allows the flow of current from battery to the capacitor. When the pin 3 of the 555 is at 0 volts, the PNP transistor allows the flow of current from capacitor to the light bulb.
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