Circuit board for flashlight - need help

[makowka]

Hello to all board members

May name is Simon. I would like to built a head-flashlight witch such bulbs:

http://www.conrad.pl/Żarówka-wskaźn...mm,-przejrzysta.htm?websale7=conrad&pi=720183

Supply 3,5V, 200mA. I would like power it through 3 AAA batteries (3x1,2V), connected in parallel. The batteries would be rechargable ones, so I think, there is a need for additional components to stabilize the power supply. I want to apply two red and two green lights, so there must be a possibility to switch between the two groups of lights, turning the whole thing off and on. I have no idea of electronics, but know some fundamental laws. Could someone please help me to design a circuit for such a flashlight?

 

[BobK]

3 x 1.2V = 3.6V which is close enough to 3.5V, so I think the batteries can drive this bulb directly.

Bob

 

[makowka]

Yes, but there are 4 bulbs, two green and two red. I would like to switch between the two red and two green lights. Maybe there has to be a resistor, to reduce the voltage? How should I connect the batteries and the lights? Parallel or in series?

 

[(*steve*)]

OK, you would need the batteries in series to power the bulbs, and the lamps sound like they need to be in parallel.