A high-power LED torch using a single AA-battery

Step 2 The parts list.

The LEDs are standard 25mA 5mm 120000mcd white LEDs from eBay. The rest are available from Radio Shack or surplus at places like http://www.AllElectronics.com.

BC327 PNP transistor
BC337 NPN transistor
1N4148 Low-signal diode or similar (Virtually any silicon diode)
0.1uF ceramic capacitor (can be anything larger)
150pF ceramic capacitor
12uF 6v tantalum cap (can be anything over 5uF)
100K resistor (controls brightness: 470k for 50mA; 68K for 120mA)
4-ft of #28 or #30 AWG wire wrap
Perforated copper boards, pre-trimmed as shown

Comments

[Shalendar]

I'm having trouble finding 25mA 5mm 120000mcd white LEDs on any reputable site.

[qs]

Any 25mA LED will work. The mcd rating is just how bright the 'spot' is.

[Shalendar]

the 25mA leds i have didnt work. My guess is that the voltage was wrong. The LEDs i have are 2v. I'm pretty sure that the LEDs you used are at least 3v. I'll have to see if I can get higher volt LEDs and try it again.

[joinaqd]

i dont have ceramic .1uF capacitors...will bigger ones work?the lowest i got is (2.2uF).