I want to connect the LED light with my phone battery. Ask for circuit masters

The voltage of the red is relatively low, and the simple way is to connect every two in series and each group in parallel. However, I recommend that you use a white or blue LED, which is bright and has a high voltage, and you can directly connect to the mobile phone battery if you don't use it for a long time!

Ask first. 1. Whether your LED is bright or bright (that is, whether the lamp beads are colorless, transparent or colored).

2 Your two are in parallel.

3 When you try, do you connect only two of a group or six of them together?

4 What is the mAh of your battery capacity

Now I can only tell you an approximate number, and when you add the above questions, I will ask my agent to come depending on the situation.

If you want to install both, you can install 10 ohms, and only one can be installed (but you have to use 1w here or your resistor will burn and smoke!). But it's hard to find a resistor as small as ohms, so it's recommended that you leave it alone. Anyway, the current is only a little bit more, and it won't overheat and burn out.

Generally, the voltage drop of LED lamp is a little more volt, the current is 10mA, you calculate, almost connect 100-200, ohm, a little bigger, generally connect 470, ohm

Use a 100 ohm resistor for each shoe and connect the LED lights in parallel.

- 100 euros ---

Mobile phone battery |LED1 LED2 LED3 --- map.

This data is ** on the map, and the final result is subject to the latest data on the map.

No, it is not possible to connect directly to a 3V LED light.

Usually, the LED lamp alone cannot be directly connected to the power supply, and needs to be matched with the corresponding power supply to supply the power, such as the constant current drive power supply. It is recommended that users wear anti-static clothing and electrostatic rings when working, otherwise the static electricity of the human body will cause damage to the LED lights.

In special places, LED lights should be installed at a certain height, generally from the ground meters is appropriate, and LED lights can not be directly installed near combustible objects to avoid high temperature and disaster situation, and at the same time LED lights and surrounding combustibles to do a good job of heat insulation and heat dissipation measures.

It is okay to use a 3V battery to directly light up the 3V LED (white or green, blue), but to light the conventional red light of about 2V, yellow light is not, and a current-limiting resistor should be added to ensure that the current does not exceed 20mA.

Of course, if you use it professionally, you still need to use constant current drive or regulated power supply.

No. LED lights must use auxiliary components, connected in series, to be able to work.

OK. However, if the forward voltage of individual LEDs is as high as above, it may not light up. You have to try.

This needs to be determined according to the voltage range of your LED light and the current range of normal operation, as long as it meets the requirements, you can!

This involves a matter of general knowledge in physics.

All batteries have positive and negative poles, but the tungsten filament of the LED light may not be able to withstand the voltage of all batteries, and the voltage of different batteries is different. For example, if you charge your phone directly with AC power at home (without going through the mobile phone transformer, that is, the charger), then the 220V voltage will definitely damage your mobile phone battery.

If you are sure that the maximum voltage acceptance of the LED light is less than the mobile phone battery you provide, then you can also turn on the mobile phone battery.

It can be connected to the LED hail digging lamp, 150mA headlight beads are connected in series with a 6-10 ohm resistance slag, and 20mA small lamp beads are connected in series with an 80-120 ohm resistance. View.

The operating voltage that the cell phone battery is at the time of operation.

Each LED is connected in series with a 62 ohm current limiting resistor, and 1 6W can be used, which is considered a set of LED lamp circuits; Connect all 50 sets of LEDs in parallel and you're good to go. The current consumption of this lamp is about the average. With a 1500mAh mobile phone battery, it can maintain sufficient brightness for more than 3 hours.

If you light up 180 low-power LED lights, although you can use the same circuit, that is, the mobile phone battery consumes an average current, and the mobile phone battery needs to choose 3000mAh to be easy to use.

The above method is a simple circuit, that is, the working efficiency is poor, the working voltage of the battery gradually decreases, and the brightness of the lamp group also decreases. To do a good job of this led light group. You need to boost the mobile phone battery to, two straw hat LEDs in series as a group, and then connect all the small light groups in parallel, and connect the output of the boost circuit.

From the working voltage of the mobile phone battery, the boost to, you can ask the seller of the power management chip to choose a suitable chip, generally this DC-to-DC boost circuit is very simple. If you want to drive 180 straw hats, the output current is required.

This friend, the mobile phone battery is, the small LED (diameter 5mm) is, only each string of a small resistance (r = u i = Europe) connected to the battery, 50 to light up on the string of 50 resistors, too troublesome, if you use 8mm LED can use 6-7, of course, with 3W high power tube or 5W on one or two, or go to ** on the buy a DC-DC boost power supply, but 50 still have to be divided into several ways, in fact, this is not very scientific, Because the mobile phone battery is a slow discharge type, the current is not so large, which is determined by the small protective circuit board that comes with the electric board, and the capacity is too small, not too bright in half an hour, in fact, this kind of light can only be used for emergency use, and it does not need to be too bright, or use a LED string with a concentrated light to a European resistor, such a small size, the difficulty of making is also low, although the range of illumination is not large, the brightness in the spotlight is also good, try it.

Shares need shares need shares.

The average discharge voltage of lithium batteries for mobile phones is the highest, and the general LED voltage drop is about 3V (different colors have different withstand voltages).

SO, can only be connected in parallel. In addition to voltage, we also need to consider the current problem, low-power LED (5mm 6mm), the full power current is only tens of mA, if there is no current limit, the battery will burn in a few seconds.

It is recommended to set a 200-2K (depending on how bright you need to be) current limiting resistor for every group of 5, which can prevent the current from abruptly burning the LED in addition to controlling the brightness.

You don't have to do the charging module, it's too troublesome. Buy a ready-made one, there is a small shop called Luqi on TB, which has a seat charger with a single-chip microcomputer, which is sold for more than 2 pieces, and it is suitable for making a charging pad.

If LZ is only used for local lighting, it is recommended to go directly to Cree's high-power LED (R5 is recommended, Zhongzhou sells 5 oceans), nothing, just add an anti-reverse diode, add a switch to connect to the battery, brighter than more than a dozen W energy-saving lamps.

If it is a white LED, set the voltage drop is 3V, the current is 10mA, you 90 LEDs, you can make 9 strings of 10 and 10, and the voltage and current required are 30V100mA respectively. It needs to be done with a step-up constant current LED driver IC. As shown in Fig

Red, yellow.

Blue, green, white.

Generally 15mA - 20mA minimum 5mA maximum of 30mA mobile phone battery voltage is, I think if there is only one battery can only be connected in parallel, if multiple batteries are connected in series to increase the voltage, you can connect several more lights in series.