Is the LED light blinking or not turning off? Ways to solve the problem

With the advent of LED light bulbs and "housekeepers", problems appeared that did not exist before. I'm talking about the flickering of light bulbs, or their dim glow when the switch is off ...

How to check the capacitance of a capacitor with a voltmeter

The easiest way to measure the capacitance of a capacitor without a specialized device. Only a voltmeter, resistor, stopwatch and calculator. What came out of it...

How to restore an uninterruptible battery

And now his main secret! After filling the cans, he takes a 100 microfarad electrolytic capacitor, rated for at least 200 V, and charges it with 100 V. Disconnects the charged capacitor from the power source and discharges it to the battery, while observing the polarity: + to +, - to -.