I am currently working on my project for my Mid-Term assessment for my EE bachelor degree. The project I chose is basically the Forever Flashlite: using electromagnetic induction to generate a charge stored on a cap which, in turn, powers an LED for about 10 min.
I've found little information online (including this site) to aid in the design. So, I purchased the Forever Flashlite and ripped it apart. After some reverse engneering, the cicuit ending up being quite simple. The output from the coil went into 2 Shottky barrier diodes BAT54A & BAT54C; the tapped output from the BAT's went across a zener diode in parallel with a .22 F cap.
:?: THE PROBLEM
Applying a load > 60ohms (drawing 25mA) across my 3mF cap charged to 1.7V will (obviously) immediatley discharge the cap. Does anyone have any ideas on how to slow down the discharge of the 50F (thats right, 50F) cap I am getting???
I have everything working, but I sure would like to kick tao's (RC) a$$; damn the Conservation of Energy.
Any input on this topic will be greatly appreciated.[/i]
I've found little information online (including this site) to aid in the design. So, I purchased the Forever Flashlite and ripped it apart. After some reverse engneering, the cicuit ending up being quite simple. The output from the coil went into 2 Shottky barrier diodes BAT54A & BAT54C; the tapped output from the BAT's went across a zener diode in parallel with a .22 F cap.
:?: THE PROBLEM
Applying a load > 60ohms (drawing 25mA) across my 3mF cap charged to 1.7V will (obviously) immediatley discharge the cap. Does anyone have any ideas on how to slow down the discharge of the 50F (thats right, 50F) cap I am getting???
I have everything working, but I sure would like to kick tao's (RC) a$$; damn the Conservation of Energy.
Any input on this topic will be greatly appreciated.[/i]