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A solar battery with a voltage of 4.5 Volts and a current strength of 900 mA is connected to contacts 1-1. When testing the circuit, you need to verify the ability of the device to charge NiMH from solar energy. The assembled circuit can be placed in a tin can.
Using a special tool, I hope you know how to properly solder with a soldering iron, connect together the red and black wires from the module and the car socket. Hide all wires inside the case and close the cover, then screw it to the bottom of the universal case and glue the solar module to it. Now, on any clear day, you can charge your mobile phone without any problems. The circuit shown in the figure below is an excellent and simple automatic charger that can be used to charge 12 volt lead acid batteries from solar panels. You can take any ready-made solar panels, because they can be easily ordered from popular online auctions.
Take the solar module and, without too much fuss and haste, place the installation wires from it inside the case. This makes it possible to mount the battery on top of the case. The next step is to take the car socket and, putting the wires inside through the special hole in the bottom of the case, push it tightly into place.
Four AA batteries (or 2 lithium) are placed in the free space.
Transistors: Q1 2N4403; Q2 2N4401. J1 is the output jack for your mobile phone. The choke is made from a piece of a ferrite rod of the magnetic antenna of CD receivers. The number of turns is selected experimentally according to the maximum output current - approximately 20-50. With this device, you can get a standard constant voltage of 5 V. The structure is recharged from a typical solar battery, inside there are two AA batteries and a stabilizing inverter on the LT1302 microcircuit. The memory diagram is shown in the figure below:
The design basis for LM317T microcircuits is an integrated voltage regulator. The BC548 transistor acts as a transistorized electronic switch that will disconnect the microassembly from the solar panel when the battery is fully charged. The circuit compares favorably with other similar ones that has a DC-DC voltage converter, which increases the low voltage level from solar cells in low light on a cloudy day to 5V required by a mobile phone. Practical operation of this charger has shown that this design produces up to 100mA at the output. Capacitors: C1 22 uF, 10 v; C2 100 pF; C3 10 uF, 16 v. Resistors: R1 1.5 kOhm; R2 3.9 kΩ; R3 10 kΩ; R4 180 Ohm; R5 4.7 kΩ; R6 10 Ohm L1 50 to 300 mH. D1 1N5818 Schottky diode.
Consider a few simple device options in this collection, so let's get started. As mentioned a little above, it will take a little money and time. Everything you need can be purchased very cheaply in Chinese online stores with free shipping to Russia. So, we need: Solar cell 6V, 50 mA or any other with better parameters. The case can be purchased universal, or you can adapt something from the one you already have at your fingertips. Glue, soldering iron and wire harness.