How to make a mains voltmeter from an old phone charger case
If you often need to monitor the network voltage, then you will agree that doing this constantly with a multimeter is not very convenient.
For these purposes, you can make a voltmeter, which, like a plug, will be inserted into a socket and visually displays the network voltage. On Ali Express you can buy a ready-made, built-in AC voltmeter. All that remains is to build it into the case from charging.
Will need
Making a network voltmeter
We take a cell phone charger.
Let's analyze it. Unsolder the wires from the board. Drill a small hole in the center of the lid.
Next, we increase it to the size of the voltmeter.
Insert the voltmeter into the hole and tighten it with a nut.
We connect the wires from the charging plug and fix them with screws. We assemble the body.
Our network voltmeter is ready.
Ali Express also has ready-made voltage meters in the form of a plug, but unlike the module, they are 4-5 times more expensive.
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