Alteration of a multimeter on Li-Ion with charging
Most hams, including myself, faced the problem of how to leave the multimeter turned on for a while and forget about it, which ultimately leads to frequent replacement of the crown due to low discharge. In this case, it’s easy to solve this problem with power.Tools:On the lid itself, with the help of side cutters, I cut off the protruding part, on which the battery will be attached.Pre-accumulate the battery before charging,I did this using the same controller.The voltage on a charged battery should be about 4.2 volts. It is advisable to take a battery with a good capacity, in my case it is 1100 mah.I soldered the battery “+” and “-” to the battery, you need to solder very quickly, because the batteries cannot be overheated.Then I cleaned the cover and glued the battery to it with thermal glue.I soldered the positive or negative wire to the input of the converter.And I soldered any of the remaining wires to one of the contacts of the switch, and from the switch I had already soldered to the battery. The switch is needed to ensure that the converter does not work in idle mode.Next, I set the voltage on the converter,which should be at least 9 volts.Then I soldered the standard power wires from the board.Instead of standard wiring, I soldered the output of the converter, observing polarity.Then I glued the transducer to the place where I used to have a crown. img src="https://sdelaysam-svoimirukami.ru/uploads/posts/2018-02/medium/1519128660_13.jpg" style="max-width: 100%;" alt="Converting a multimeter to li-ion with charging">On the front panel I will install a switch, for him I cut out such a window. The switch can be installed from the side, but it will not be convenient.
Materials and toolsMaterials:
- Soldering iron (solder, flux).