Installing a battery into a multimeter

Topics / Repair, modernization

Added 10 comments

In this article, the Master will share with us his experience in remaking a multimeter powered by a battery + installing an LED for backlighting.

Tools and materials:
-Multimeter;
-Charge controller;
-Switches;
-Copper wire;
-Mosfet N-channel;
-NPN - transistor;
- Resistor 150 Ohm;
- Resistor 3.3 K;
-AKB 3.7 V;
-Micro USB connector;
-Controller TP4056;
-Increasing Converter;
- Voltage Regulator LM317;
- Resistor 15 Ohm;
-Glue gun;
-Soldering accessories;
-Nippers;
-Knife;
-Insulating tape;

Step One: Scheme
The wizard will use a boost converter in conjunction with a charge controller and discharge protection. The LED can be connected either to the power supply board or via the LM317 circuit.

Step Two: Boost Converter
The wizard collects the boost converter. This is a very simple boost converter built on a pair of transistors.

Step Three: Charge Controller
Installs a charge controller.

Step Four: Build
Built in LED housing.

Installs a USB connector and switch into the chassis. Installs all boards and secures wires.

Connects the battery and tests the device.

Secures the battery and assembles a multimeter.

All is ready.

Question \ topic is automatically published in the social. site network - stay tuned for answers there:

February 20, 2020 19:07 +1

Reply To quote A complaint

Profanity and a complete lack of aesthetics. From the category of "worst implementation of the project."

Guest Vitaliy February 10, 2020 10:36 +1

Indian or Pakistani collective farm from which you do not need to take an example, but just look and laugh!

Guest Vladimir February 5, 2020 10:18 p.m. 0

I remade all the devices on Li-Ion a couple of years ago, only a little differently, I think, easier. Built in add. switches (sliders), DC-DC boosters and charge modules with USB. During this time, only one multimeter (I use it constantly) and charged. Everything else does not require charging.

Guest Serg February 5, 2020 9:28 p.m. 0

and I, without worrying at all, put 3cell lion in the multimeter. All things

February 5, 2020 16:24 +1

On one of the sites

Guest Alexander February 5, 2020 12:14 +1

Trash. I think so many people think, but do not dare to say. The circuits do not match, and stupid for this case. Why stabilizer 7805? ... I thought for a long time ...

Guest Sergey February 5, 2020 09:38 +1

A guide is how NOT to do, but how categorically it IS NOT! Collective farm, this is still affectionate!

Guest Michael February 4, 2020 10:03 +1

For the idea of 5+, but the implementation let us down. It is clear that everything is done from Mr. and sticks (read from what it was), but it was possible to arrange everything carefully and not pick such holes in the multimeter ..... I would be ashamed to spread this for all to see.

February 3, 2020 11:16 p.m. +1

Something tells me that the backlight is more appropriate for the screen to create ...

Guest Denis February 3, 2020 22:42 0

I haven’t seen such a collective farm for a long time, I did what it seems like I used the U multiplier from the x100, with lm358 mobile phone to control consumption (in order not to be smart with the switches, that is, I turned on the multimeter lm, I saw that there was a consumption and started the multiplier) and the charge controller with aliexpress. It still works without problems. :)

Installing a battery into a multimeter

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