After several cases of discharging the battery of the mouse at the most inopportune moment, when there is no power outlet at hand, the idea came up with the idea of creating a universal charger from improvised means that allows you to charge the batteries from a laptop.
For greater versatility, the ability to charge the phone was also added, by connecting the plug to charge the phone in parallel, as a result, even while on the road, you can charge the mobile phone without any problems.
And so, to create this device, the back of a broken control panel, for example, a TV, was used. In general, the main thing is to have a workable AAA battery compartment, we just need to take it and saw it off for later use in the device.
Now we already have a battery compartment, then we take any old charger and cut off the plug on it, as a rule, there will be two wires there - red (+) and black (-), the main thing is not to mix it up. It is strictly forbidden to connect the charger directly to the batteries for your own safety, the power supply to the batteries will be connected through a special chip that is in any telephone battery, it serves just to limit the power supply when the battery is fully charged.
Connecting this circuit is not difficult, the plus for the charger will be a soldered contact to the body of the battery itself, although in fact each contact is usually signed, the main thing is not to confuse the input with the output.
The next step is to install a mini usb jack into the device, it can be taken from any broken player or phone, it is very easy to connect it to the first contact - plus, the fifth - minus, it should be connected to the input above the specified microcircuit.
To indicate the operation of the charger, it is convenient to use an LED taken, for example, from a lighter with a flashlight, it is necessary to solder it through a resistance of 150 to 500 Ohms to the outputs of the microcircuit.
Having collected all this, we get a universal charger with the ability to charge the phone and batteries, both from a laptop or computer, and from the network.
