» Electronics »Finalization of the digital multimeter D831

Refinement of the digital multimeter D831

Electronics / Fixtures
Added 29 comments

Good day dear the inhabitants of our site! I'm new here so don't judge strictly!

Today I will show you how I finalized the digital multimeter DT-831, you can also use this revision for other models powered by 9V crown.

The essence of the revision is as follows: to power the multimeter from a 3.7V Li-Ion battery, with a charge function and its indication! And so let's get started.

STEP ONE
We need a ready-made charge module 5V and current 2A

And a ready-made DC-DC step-up voltage converting module with 2v-30v

The Li-Ion 3.7V battery with a capacity of 2500 mAh is also possible with a larger or smaller capacity, I had this one in stock.

Two LEDs [red, green], wires, soldering iron, tin and rosin.

STEP TWO
We make two holes for the LEDs

We solder all the details as shown in the diagram

We set the voltage 9v at the output of the boost converter with a trimmer resistor.

STEP THREE
We fix the whole thing with hot glue in our multimeter in an empty place, you can do as in my photo.




STEP FOUR
Once the glue has dried, you can collect the multimeter and use it, now you can forget about the crown battery once and for all.
Red LED indicates battery charging

Green indicates that the battery is charged

Thank you all for your attention! See you soon!
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Added 29 comments

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29 comments
+2
Reply To quote A complaint
I also ran into a problem like expensive batteries, and I had to go to the store when the batteries were running out. and then once recharged continued to work with the tester. only at first I made two batteries from a 900ma phone (sequentially) they lasted for 2-3 months. and then I got the same 7.4 volt lithium. the tester lacks much in vain. but through the converter a lot is lost on increasing the current and not on the tester. therefore, enough for five days.
+9
Reply To quote A complaint
Perhaps my version is also useful to some people. I also didn’t like the prospect of changing Krona often, and there were 2 little batteries at hand. I still didn’t want to pop a switch every time to turn off the multimeter. I purchased the MT 3608 DC-DC Step Up module from the Chinese The microswitch breaks the positive wires from the batteries to the converter and from the converter to the multimeter, so the batteries will not be discharged during breaks. Conversion does not require special skills, and from English it is enough to know In and Out. Everything is right in its place, nothing is shaking.
0
Reply To quote A complaint
By the way, it’s not at all a topic, but I want to point out again about regional differences .... Remember, you talked about pipes? Today I asked a professional plumber (Montanic plumbing in BrestZhilStroy) ... He replied: "Well, before, in the USSR, of course, they only called pipes in millimeters:" twenty "," thirty-two "," forty ".... It's already now fashionable to call it "inches" and "three-quarter" ...

Here you are ... Therefore, I was surprised then .... Do you, on the contrary, succeed there?
0
Reply To quote A complaint
Well, in fact, everything is different .... For the first time I hear about KBS-ki m FBS-ki ....))))). Here is what in the photo, for example, we called 373 and 343 ... Now they are called R20 and R14
(these are only at hand now).
And what you describe is most likely “three hundred and thirty second,” or, as they are now called, R10. In my childhood I had a toy gun on this, and in my school days - an ohmmeter.)))
Now we have on such a machine for cutting "coils" on clothes ...
Yes, I have not seen Russian production for a long time ... But here we have Poland two kilometers away ....))))
+3
Reply To quote A complaint
While I was looking for info about FBS I found an excellent one.
+1
Reply To quote A complaint
FBS-0.25 is an element with a very small self-discharge current, so they served in testers for a very long time. Here, I found it.
+1
Reply To quote A complaint

For example, in this.
0
Reply To quote A complaint
Quote: Valery
And enlighten the illiterate: FBS is what? I guess that the battery, (hardly you are talking about the foundation blocks)))). And which one?
In my youth I had a "Tseshka" at 3336, and the current one - at the "sixes" (316's, or AA, as it is fashionable to call them now)

yes Well, there are such FBS-ki, round batteries in size, as if half of the element of KBS-ki

They stand in the devices, I also have such devices. This is really a shortage. But in this case, in my devices there are KBS-ki also a certain deficit. I got a little carried away.)))
0
Reply To quote A complaint
And enlighten the illiterate: FBS is what? I guess that the battery, (hardly you are talking about the foundation blocks)))). And which one?
In my youth I had a "Tseshka" at 3336, and the current one - at the "sixes" (316's, or AA, as it is fashionable to call them now)
0
Reply To quote A complaint
Quote: Ivan_Pokhmelev
One ambush - FBS is no longer produced, it is necessary to put other elements through gaskets-clamps.

I do not know, but in my provincial town I buy FBS. I order and bring (a friend works in such a store, the owner))). Although I have an adapter for FBS, insert 3 fingers and go ahead. No problems. Here in such I also "stick" them. I have them there already two FBS.

Beast appliance when working ... mosking
0
Reply To quote A complaint
Quote: Roman2468
the battery is alive and well

Its capacity was not measured after a year of bullying?
+5
Reply To quote A complaint
Quote: To Delusam
I consider him the most unreliable and primitive.

I used the same 830th for several years at work, only screwed on a furniture magnetic latch on top (there were no Chinese neodymium speakers then): it is very convenient to sculpt anywhere on the equipment. For repair purposes, special accuracy is not required, but convenient: I put it in my pocket and went. And reliability is yes, it’s just as lucky, but I had a 1998 release, then it was considered quite decent in quality. And I have been using the TL-4M arrow for more than 30 years. An ideal device with very convenient scales, you do not need to count anything, you can measure the transistor as a first approximation.One ambush - FBS is no longer produced, it is necessary to put other elements through gaskets-clamps.
0
Reply To quote A complaint
But my "favorites", "switchmen".

And here our views do not agree ..))))
More precisely views converge - I also admit that next to the good old Tseshka, none of the modern ones stood nearby. (And there is one available. Ts-43101. I started with these once, when there were no others)))).
But now my “favorite” is the one in the yellow “halo”. (I have two of them). Why?...
Yes, because the electronics are not mine! I am an amateur in this, and I need a minimum from the tester - voltage “constant-change”), resistance and (conveniently) “dialer”))). Well, sometimes the current strength (Amperes. Not "miles"). Precision "household" also suits me! And therefore I am more comfortable with a small compact and STRONG tester, with which it is convenient to "climb" the car, for example. And it’s good that he could "freeze the scale" in case of inaccessible places.
..A "Tseshka" - it is for professionals .... When "work is brought to her," and not her to work!))))
As for those here, as in the subject, I also bought a few pieces (On Ali) and put them in the cars so that I was always at hand whenever I needed it spontaneously ...
0
Reply To quote A complaint
Guys, well, you give. Inflated the topic, the device is not worth it. I consider him the most unreliable and primitive. The most for "excrement".)))
Actually, all of you are right here, but your claims are based on your theories. Perhaps the right ones.
Quote: To Delusam
It’s probably convenient need to check.

This is not in the market, this is part of mine. Among them there is no “one,” he is “not a couple. Although he is there, too. But my“ favorites ”,“ switchmen. ”Photo for a long time, from a mobile phone. declare

-5
Reply To quote A complaint
Maybe the "specialist" who put a "minus" will explain the reason? ;)
+1
Reply To quote A complaint
It was better to place the step-up converter on the cover; a little less interference would be on the measuring board. There it was also possible to solder an additional capacitor to the output of the module.
I will assemble everything in one place: put the switch in the gap of the positive wire from the charging module to the conversion module and solder the current-setting resistor on the charging module.
-1
Reply To quote A complaint
Quote: Roman2468
... regarding the charge of the battery 0.7 or 1A will not play a big role, nothing will happen to the battery, only the charge time will change.
You can remain with your erroneous opinion. I am writing not for you, but for those who decide to repeat.
0
Reply To quote A complaint
It is necessary to charge with a current of not more than 1C, you have more charge current.
+8
Reply To quote A complaint
In such testers, the battery did not bother me personally. (I do not forget to turn it off)))). The bodies strained me !!! It hurts they are weak! Slightly dropped - everything, not everything shines already ...
And therefore, I modified it differently - made a “galosh” of foam polyethylene like rubber, which are equipped with its more expensive brothers!

This kind of refinement significantly prolongs his life ....
.... And if, instead of red tape, wrap BLUE (!!!) - it will be eternal! smiles
Author +1
Reply To quote A complaint
I apologize for the typo, not 2A but 1A, but regarding the charge of the 0.7 or 1A battery, it won’t play a big role, nothing will happen to the battery, only the charging time will change. For already a year I have been using this charging module, the battery is alive and well!
+4
Reply To quote A complaint
Quote: Roman2468
This is not a problem, the hour and the battery is charged,

At the most inopportune moment, this will let you down.
0
Reply To quote A complaint
5V charge module and 2A current
- the link is not 2 A, but the standard 1 A.
In addition, it is necessary to re-solder the current-sensing resistor, because for 14500 1 A is a lot, you need no more than 0.7 A.
-5
Reply To quote A complaint
Soldering with tin is bad! It is necessary to use solder.
Author +2
Reply To quote A complaint
This is not a problem, an hour and the battery is charged, it lasts for 3-4 days, it is better than buying a crown every time it sits down!
+5
Reply To quote A complaint
The battery will be useless to discharge when the device is not working.
+6
Reply To quote A complaint
To choose the right elements, to place them correctly, to put them together correctly - both the head and the hands are needed. You don’t make nuts yourself?
+6
Reply To quote A complaint
Bought, connected, inserted - homemade !!! ??? Bravo!!!
+1
Reply To quote A complaint
Roman Handsome !!!!
+1
Reply To quote A complaint
And what is interesting. This is probably convenient, you need to check. But what I liked more is the first part. Buying such a battery is no longer a problem even without ALI. But the charger ... it's easier to do that.
Well done! +

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