Chris Brown

What components do I need to produce 8 Volts 200mA?

Hello & Good day to you all,

I’m making my own powercell for a miniature wireless CCTV camera (Link Below for specs)

http://www.bestofferbuy.com/wireless-pinhole-spy-camera-hidden-spycam-nanny-cctv-12ghz-ntsc-p-14478.html

After spending stupid money on sh*t 9 volt batteries (600mAh = £11 EACH) – ive had enough of the crap and absolutely absurdly LOW capacity 9 volt batteries out there (when TODAY’s ‘D’ cell is capable of 11,000mAh !!!) and extremely high cost – i am making a battery-pack to power my receiver and another power-pack for the wireless camera using 8 x AA 3800mAh Ni-MH rechargeable batteries.

I should add that my existing 9-volt (2 new & 1 old) rechargeable batteries are a little-more-than USELESS (Rated @ 175mAh…{USELESS}) as the receiver drinks the power (juice, lol) at an extremely FAST-Rate… 15 minutes of use and its DEAD. 10 mins of use from the old 9 volt battery. And thats all from a 9 hour charge… How pitiful…Despicable, even…

Now i got the idea to use a semiconductor from an instructable to make a simple solder-fume-extractor… (Link Below!) and also i know that resistors can reduce the voltage and amperage output of a circuit……….

http://makeprojects.com/Project/Mini-Fume-Extractor/21/1

So my 8 x 3800mAh AA batteries = 9.6 Volts

But i need to add a semiconductor and a resistor to my battery-pack so that the output (in volts) is 8 volts MAX and output (in milliamps) is 200mA…

My question is which semiconductor and resistor ?????

I have calculated, researched, ‘Googled’, calculated again, more googled & now im going to give up and finally cry-out — HELP !!!!!!!!!!!!!!
lol

Please please please can anyone help me find the components i need to make my very simple circuit for my battery pack !

I know that the use of a semiconductor (3 pin only) can let in a certain voltage and only output a specific voltage & amperage – i think i’ll be needing a combination of a semiconductor and a resistor but i’ve searched continuous for 3 months now and am now irritated that i still haven’t found what im looking for! ffs!

Many thanks in advance for some light on this darn-troubling matter….

P.S. 2 days at a time, many times a month – i have been researching! (& 8 liters of red-bull equivalent to help !) Yes. I’m a caffeine Nut. And NO, im not cutting down, Its sugar free tho, lol !

Please Help !!!

Power-Specification For My Gear:

Wireless Receiver:
DC 12V 500mA

Wireless Camera:
DC 8V 200mA

Ingredients So Far:
- 20 x AA 3800mAh Batteries
- Solder Tabs for battery Packs
-Small to medium collection of semiconductors + & – output voltages (from -24v to +25v) and from 100mA to 1.5mA amperage…
- Heatshrink (40mm, 50mm, 70mm)
- 5 x Battery Boxes/Cases (with bare wires and built-in switch) {4 x AA per box}

Two Examples of the closest semiconductors i could find to meet my requirements:

1.

http://cpc.farnell.com/national-semiconductor/lm2940t-8-0/ic-regulator-ldo-8-0v/dp/SC05413?in_merch=Products%20From%20This%20Range

2.

http://cpc.farnell.com/on-semiconductor/mc78m08ctg/v-reg-8-0v-78m08-to-220-3/dp/SC08349

Again, many thanks in advance for all help given !