LONG LIFE BATTERY-Mei electronic by the road a ship not
Mei electronic by the road a ship not
Mei electronic by the road a ship not ？It is connected between the positive pole of the solar cell PC3 and the earpiece by the main thread.Before connecting the last solar cell in this circuit, all wiring must be correctly connected as shown.After the last battery is connected, listen to the sound in the headphones.Headphones must be electromagnetic or low impedance. Headphones used in crystal receiver do not work well in circuits powered by a small power supply.When a sudden " filar silk" sound is heard in the headset, you can tune to a local radio station and then move the antenna to the most appropriate position to hear the maximum volume.
If you can't hear the sound, you should check the wiring of the solar cell.And * find out if these solar cells can receive enough light from the sun or other light sources.Check whether the diode 1 is connected reversely.This kind of component is very easy to connect and reverse in the circuit.If the diodes, triodes and solar cells are connected correctly, the circuit should work properly.If still not working, the diode or triode may have a problem.Then a voltmeter is connected to both ends of the solar cell to check their output voltage, which should be 1V DC.If the voltage is only a few tenths of a volt or even zero, check all wiring again.Another reason may be that there is not enough light to irradiate the surface of the solar cell, or that a defective cell is connected.After replacing all the damaged components, the AM radio powered by solar cells will certainly work.
4 - 24 Cheap 12V Battery Charger
The main disadvantages of the popularization and application of solar cells are that their price is too high and their output voltage is too low.It takes at least three solar cells to make a 1.5 volt battery pack.If one diode is used in the circuit, four solar cells must be connected.If these three solar cells are devices with high current power, the price of each solar cell must be very high, and the price of the No. 1 dry cell is generally much cheaper.But brigade + KP hungry by oil and said Tian 3t white secret "
- peak reverse voltage 50v. 2a rectifier PCI - pck - 1a solar cell s' * double - pole double - switch figure 4 - 2712v battery charging circuit
Readers may find that most of the devices described in this chapter are powered by solar cells of 6 volts or less.The 6 - volt power supply uses 14 solar cells, even if it is a medium-power solar cell, its price is still relatively high.For many electronic circuits, 12V is a standard voltage. Although 9V power supply is also commonly used, 12V DC voltage is more widely used.
To make a solar cell stack with an output voltage of 12: V DC, only 28 solar cells are needed.If the rated current of the battery is 1 ampere, the price of this combined battery is really too expensive.Due to economic factors, as long as low voltage circuits can be used, low voltage should be used as far as possible.For circuits that must use 12V DC voltage, the design shown in Figure 27 can be considered.
In this circuit, the solar cell serves as the charging power source for the battery and charges two groups of 6V rechargeable batteries.Due to the series connection of battery counties.So its output voltage is 12V DC.Because the battery pack is individually charged, that is, a group of 6V batteries is powered by a group of 6V solar cells.A double-pole double-throw switch is used to continuously switch between solar cells by hand so as to make the charging amount of the two groups of batteries nearly equal as much as possible.Since only one battery is allowed to be charged at the same time, the charging task must be completed by hand.
Because the charging current of the battery is required to be 1A, the design requires that the solar cell is also rated at 1A.If the required battery charging current is small, a small solar cell can be used.In fact, as long as the charging current value of the battery is satisfied, any type of solar cell can be selected, and the charging current value is determined by the discharge volume of the battery, that is, the electricity consumption of the circuit.The diode connected to the circuit is installed to prevent the overcharged battery feedback current from damaging the solar cell.
Figs. 4 - 28 show the connection method with the double pole double throw switch and the solar cell stack after the two batteries are connected.Correct wiring according to the drawing, otherwise, the solar cell cannot charge the battery.If the polarity is reversed, the solar cell will be damaged, even,?Up to now, the current of the N - RRF - RTR RRT - V - R4 - TAF A * - 4 - * RD bus will escape
It should be remembered that switching the double-pole double-throw switch once every hour will connect the solar cells to different batteries, which will make the charging power of the two batteries equal.If the illuminance of the sunlight changes frequently, the switch will be switched to one position every half hour.This is certainly not an important issue, but it needs attention.If you put solar cells in one place all day, then you must charge them in another place all day. Only by doing so can you charge the two batteries evenly.
The installation method of solar cells is nothing special with the method described above, and its installation method depends on the type of battery selected.Small solar cells are fried to be mounted on a perforated circuit board, while large solar cells of 1A need to be mounted on a plexiglass or other insulating material board.You can use this power supply to power the circuit while charging the battery of the power supply without worrying about damage.