How to make an isolated and adjustable backlight (LED) tester?
There are many ways to make an LED tester. The output of all these circuits has a voltage above 250 volts, but the current is very low. If the output current is high, it shocks the person. So, no matter how you build the circuit, you must reduce the current at the output. In this circuit, with the help of two iron transformers with small dimensions, we create an output of 250 volts but with a low current. To further reduce the current, we can add a consumer such as an LED to the output so that every time we need to reduce the current more, we can reduce the output current by pressing the key.
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00:00 Description of the circuit and test of the LED tester or backlight tester
03:36 Description of the backlight tester circuit with schematic help