brightness white LED lamp (hereinafter referred to as white light) with light colors good (close to daylight), energy (electro-optical conversion efficiency is much higher than incandescent, but also higher than that of fluorescent lamps, is a cold light source), long life (life is a fluorescent lamp several times (several times incandescent), environmental pollution became incandescent and fluorescent characteristics of a strong challenger. but the downside is that prices are higher. Currently, the white light has been developed to the second generation; s white light generation prices have dropped significantly, F5 the price has been reduced to white light 0.25 / only, the price of white light disassemble F5 0.2 / only, the price has to be acceptable. I long ago the price of 0.16 yuan to each order F5 disassemble parts of the dozens of white light, use it to produce a few lights, good results, is an introduction to the lovers.
Mains 220V 1.2W white LED lighting
    Cans with a spherical tank bottom, rounding with scissors, drilled 20 holes in the above, the distribution of holes were round, try to make something too beautiful, just the size of the hole can be embedded in white light for the degree. White lights to each voltage 3.0V ~ 3.6V, 4 a group of white lights in series, operating voltage is 12.0V ~ 14.4V, 5 parallel groups and then white light up in the 12.6V voltage approximately equal to 100mA current power consumption is 1.26W.
   220V electricity to work, you need a buck rectifier filter circuit, less expensive way is to use waste for energy-saving lamp control circuit. Energy-saving lamps can be said that everyone has, because of the low value, do not want to repair damaged repair shops generally are treated as waste disposal, so you can not spend money or only a small amount of money received in the waste sites and other places. In fact, most of the damage to energy-saving lamp tube is broken, the circuit is often well used, even if damaged is also easy to repair. 5W ~ 13W energy-saving lamps are used basically the same circuit and components.

Mains through the rectifier and C1, C2 be about 300V DC filtering added to the Q1, Q2 inverter circuit composed, produced tens of kHz high frequency oscillation, the L, C5, T on the discharge tube so that light energy-saving lamps . L and C5 form series resonant circuit, resonant frequency generated in the inverter circuit on the oscillation frequency. Lamp starts, the discharge lamp is not conducting, the resonant circuit, only the lamp filament resistance, the resistance is relatively small, relatively large current loop, the current in L and C5 to generate hundreds of volts, C5, on breakdown voltage of the discharge lamp light. Discharge lamp resistance is very small, it is in parallel with C5 on the Q value of the resonant circuit greatly decreased, C5, and L the voltage down to tens of volts to maintain the continued discharge lamp, which shows the voltage of energy-saving lamps work relatively large changes. Transformation of energy-saving lamp should the power of white light can be directly connected to the C5 L and T of the primary, then L conversion transformer, rectifier and filter circuit to increase the pressure.

In order to more stable low-voltage DC output, L and C5 can not be used as a resonant circuit, the resonant frequency should be much lower than the oscillation frequency inverter circuit, to increase the capacity of C5, from 332 to 473 (ie, 0.047 uF) or greater, even without the C5. L transformation of the transformer is added around the outside of the L low-voltage coil windings. 0.15 ~ 0.17 L generally use the magnet wire, 300 to 320 turns. Measured coil voltage 80 ~ 100V, which can be approximately equal to the number of turns per volt 3.
    The way power rectifier full-wave rectifier bridge can be used or double half-wave rectifier circuit. In order to save and reduce the loss of two diodes, the author double half-wave rectifier circuit, double the number of turns required transformer secondary, and center tap. DC voltage supply of white light selection is 12.6V, so the secondary winding of the voltage should be 12.6/12 = 10.5V (DC voltage output filter capacitor is approximately equal to 1.2 times the AC input voltage), number of turns in secondary coil is equal to 10.5 × 3 = 31.5, desirable for the 32-turn, the resultant secondary coil is equal to 64 the number of turns in the center of the first 32 turns out. White lamp current 100mA, copper per square millimeter at 3 amps allow calculation, the choice of 0.25 diameter of the wire, its cross-sectional area equal to 0.049 mm2, allowed by the current is 147mA, more than needed 100mA, to meet the requirements .
    Commonly used energy-saving lamps L random coil around the way, winding relatively loose, occupy more space, plus the coil in the original 64-turn coil around the difficult, the solution can be autotransformer way. Circuit installed in the energy-saving lamps for the original head, the body will not come into contact with ramp control circuit, security is no problem. Auto mode is more efficient, than the provinces with the material, but also on the original coil around the next frame. The specific method is to remove the 64 turns of the coil L turn, and then about 0.25 along the primary coil of enameled wire wound around the 64-turn directions, taking turns in the center of head 32. Padded winding insulation materials do not, do not hand around the winding machine can. If it can not find the 0.25 enameled wire. Another energy-saving lamps can be removed from the coil L, 0.15 enameled wire with coil wound 3 shares and up. Core coil fitted to the attention of the core leaving a gap at the butt. That is, a layer of adhesive paper pad seams, designed to avoid core saturation.
    Rectifier diode can not use 4007 (low frequency) or Schottky tube (low pressure), use FR107, RU2 and other fast recovery diode. Then the circuit board section foil minor changes, added a few components can be installed in the original circuit board.
    Recruited in the first energy-saving lamps can be used to try the circuit is intact. The most easy to damage the circuit components are two 13001 transistors, followed by C1, C2, C5, and four 1N4007 rectifier diodes used, the possibility of damage to other components is relatively small. Check if the element with a multimeter intact. Can power test. First power line in series with a 300O2W ~ 5W resistor, one to protect the circuit (if the circuit has been identified in case of short circuit, with resistance to avoid failure to expand), and secondly, measure the voltage to calculate the resistor circuit current and power consumption. First of all no-load operation test circuit. The transformer T2 secondary is not connected load. Pass into the post-220V AC, 300O the voltage 0.9 ~ 1.2V to explain the circuit is working. If the voltage is below 0.8V, that relatively large coil inductance, inverter circuit is not easy to start-up, the circuit can not output DC, T2 can be used to increase the gap solution to the core. That is, the joints in the core then place a layer of paper. If the voltage exceeds 300O 1.4V, that the gap may be relatively large core. Seams can try to change the core thinner pad of paper. If the voltage is still relatively large, it is likely the transformer internal fault, or elsewhere on the circuit failure. Normal load test, the next step connected to the rectifier filter circuit, and leave the load resistance. According to the voltage and current white light, white light can be calculated resistance is equal to 12.6/0.1 = 126O, can be a 120O2W ~ 5W resistor instead of white light received a DC power supply. Power test, 120O resistor voltage 12.4 ~ 13.5V to show that the circuit is working properly. If the voltage is low, can increase or decrease the number of turns C5 T2 secondary electrical capacity to resolve. If the voltage is high, can reduce or increase the number of turns the secondary coil T2 C5 do not even have the electric capacity of C5. The test is complete, remove the dummy load resistor connected to the white lights on the board, and finally into the circuit board inside the lamp, then domed head and glue together with white lights, white lights the whole production came to an completed.

Normal white light 300O when the voltage is 2.8V ~ 3.2V, power consumption 2.1 ~ 2.35W, 5W energy-saving lamps contrast, (try a few test 5W energy saving lamp, its power are about the 5.2W), white light power less than half the power of 5W energy-saving lamps, lighting effects and realistic (in the light of the positive) and significant energy-saving lamp 5W.
    If the local mains voltage is unstable, increase the composition of a 7812 regulator circuit, as shown in Figure 5. For 7812 to work properly, the DC voltage after the rectifier filter should be 14V ~ 16V, the secondary coil T2 should be appropriately increased the number of turns. Figure D6 is intended to use to make the output voltage is equal to 12.6V.