How to make the simplest 1.5 volt LED energy-saving lamp, flashlight?
The comrade upstairs was not quite right. Positive guide of white LED through voltage does more than 1 batteries, but the market does have a battery power supply using the LED flashlight, before the "radio" magazine also introduced, you can use a simple self-excited shunt switch power boost, and then drive LED. At that time the magazine for circuit drawings, switch 13001 as a side switch with a small power, coupled with the control base current on a secondary resistor, with a 1N4148 high frequency rectifier, transformer with high frequency magnetic ballast inside the winding. This circuit is very simple, I have not tried. But I used the voltage circuit structure of 6V is similar to the EI power transformer lighting fluorescent lamp, the boost circuit is feasible. The original circuit I can not find, the following illustration of the picture for reference only, the first side of the same structure, the two side does not need to double voltage rectifier circuit, the direct 4148 half wave rectifier is ok. Similar circuit in Baidu pictures search there are many, there is no transformer structure, the use of inductance step-up.
As long as a boost Ic, a small capacitor, a small inductance, two small resistance to get. I did, I also use it as a direct charge for charging the mobile phone.
Use the 1.5v-3v battery box to connect the bulb. The bulb has no positive and negative poles. It's that simple.
