maz wrote:Arun saab
Do share plans of your brilliant battery pack.
Mazumdar saab,
Follow this 6 step process ( or because you are a dear friend I can make one for your camera, give me a buzz).
1) Choose a battery case that can accomodate the minimum number of rechargeable cells to produce the specified camera DC power input voltage. So of your camera DC input jack says 7.2V and you will use a NiMH cell {nominal @1.2V each} then use 6 or at most 7 cells to generate a voltage slightly more than the desired voltage).
2) Choose one of the following adjustable voltage regulator parts (they are all what is called LDO Low Drop Off regulator meaning as the battery pack voltage drops below specified output voltage they will tend to remove themselves from the circuit and pass full battery voltage to the output)
- A. Sharp PQ200WNA1ZPH, @ $0.95
B. Fairchild FAN1117A
C. ST Microelectronics LD1117ASTR @ $0.77
D. Fairchild FAN1540B @ $0.37 in 1K volume
3) Use the reference design in the regulator datasheet (url in the web pages of the regulators). Just choose the 2 resistors values for a given output, and connect 2 capacitors for stability.
4) Solder these 4 parts on a prototype PCB (one can even use a cardboard or plastic) and connect to the battery and camera connector.
5) Apply glue or epoxy on the 4 piece electronics to ensure the wires are not exposed (to avoid any short circuit with stray metal pieces in your pocket/pouch). Glue this bob somewhere on the battery pack
6) Check output voltage using a multimeter.
& Ready set click click ... . . .
)
