I made a non-rechargeable digital multimeter rechargeable.

How are you all? I hope everyone is well and healthy by the grace of God. Today I am going to share some digital multimeter modification work with you.

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Those of us who work with electronics and electrical equipment often need one thing a lot, which is a digital multimeter. We cannot work without this digital multimeter to measure any parts and any battery and any current.

The digital multimeters that have recently come out in the market are made with a 9-volt fixed battery which does not have a charging system, and the battery has to be changed every few days for 60 to 100 taka.

So I have created a new invention that will make my digital multimeter rechargeable, and a charging system can be made, so let's see, step by step, how I made this system.

Step -01

First of all, you can see a 3.7-volt rechargeable lithium-ion battery in my hand. I will be running my digital multimeter with a 3.7-volt lithium battery, but the digital multimeter is powered by 9 volts. Now I have to convert 3.7 volts to 9 volts.

Step -02

Now you can see a DC-to-DC boost converter in front of me; I don't remember its model number. It outputs from 3.7 volts to 35 volts DC. I will take 9 volts from here with 3.7 volts to run my digital multimeter.

Step -03

To charge the 3.7-volt lithium-ion battery, I have taken a charging protection circuit here. Through this circuit, the 3.7-volt battery will be charged, and a blue light will indicate, as needed, that my battery is fully charged, and this circuit also has a model number.

Step -04

Now you can see in my hand a 9-volt fixed non-rechargeable battery which I have removed from the digital multimeter, and I will throw it away now, and I will show you my work.

Step -05

Now you can see that with the input line of the digital meter, I have fixed the line voltage output line of the boost converter, and I have taken out the input connection of the 3.7-volt battery.

Step -06

Now you can see that with the input connection, I have connected the battery and put an on/off switch which will help to turn on my meter so that my boost converter is not always on and does not get charged.

Step -07

Now you can see that my digital multimeter has started up very nicely. Now my digital multimeter is being powered by a 3.7-volt boost converter and has become rechargeable. There is no problem with changing the battery, and you can see that my meter is in running condition and a red light is indicating continuity mode.

✅ CC: My friend @rmm31

🟩 Thank you for reading my post and giving your valuable time. Stay well and stay healthy. God bless you. 🟩