In this quick fix I got an emergency light for repair. Device worked in such a way that it was always connected to the city electricity and kept the battery fully charged. As soon as the power goes out, light turns on using the battery. Therefore, it should not have a complicated circuit and the first thing to check is the battery. In Iran, buying electronic components is an easy task, and I have been ordering almost everything I need online for several years, and I get it in less than two days.
Namely, in Tehran, there are large shopping malls to buy electronic parts and modules, but due to traffic and general congestion, there are online stores that also have good support. let's move on. After making sure of a problem with the emergency light battery with a USB power bank, I placed an order for a new battery and the job was done.
After repairing the emergency light, I looked at its circuit. It's got an straightforward and amusing circuit.
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