JamesBourne
- Sep 26, 2010
- 6
- Joined
- Sep 26, 2010
- Messages
- 6
I'm currently building a project that generates a frequency using a 555 timer. Since the power requirements are low, I thought of using a small, rechargeable battery. After dismantling one of those "battery-less" shake flashlights, I found a Ni-MH 40mAh 3.6V battery inside.
My problem comes with the voltage. The 555 requires at least 5V to operate and the battery usually gives 3.1V after a quick shake and 2V after leaving the light on for a few hours. I have read that you can use a charge pump to raise the voltage, but the IC used to do this also requires 5V!
So, if possible, how can you raise the voltage about 3 times without using IC's? Schematics will be much appreciated.
Thanks
My problem comes with the voltage. The 555 requires at least 5V to operate and the battery usually gives 3.1V after a quick shake and 2V after leaving the light on for a few hours. I have read that you can use a charge pump to raise the voltage, but the IC used to do this also requires 5V!
So, if possible, how can you raise the voltage about 3 times without using IC's? Schematics will be much appreciated.
Thanks