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Alteration of the cordless screwdriver in the network

Power supplies / Instruments
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How to convert a cordless screwdriver to a network one?

The batteries on the screwdriver become unusable after about two years.

The engine is still quite working, it's a pity to throw it away. Replacing both batteries costs almost like a new screwdriver.

There is an exit.

We will need power transformer (output from about 20 to 22 V). After straightening, 18-19 V. is obtained.



Four diodes, for rectification of current. I took diodes D 246. With a maximum allowable current of 10 A. It is possible and higher.
Out of ignorance, I assembled a rectifier bridge from D 226, so they immediately burned out for me (they have an allowable current of only 0.5A) So the more powerful the diodes the better.
Alteration of the cordless screwdriver in the network

And so we take the idle battery pack and remove the batteries from it. Leave only the top two (we will solder the wires on them to power the screwdriver).

We are assembling a diode bridge (I found a piece of getinaks, I placed everything on it). In the battery pack came just in size.







We collect the box back, plug it in and use it.
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49 comments
0
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You tell beautifully pictures ... smiles
0
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Quote: Valery
With a fool, as you know, it is possible and .... to break everything ...))))) But, in fact, no one really heard about the fracture of HIS.)))))
0
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Quote: pogranec
What choice? Throw away or buy akb at the price of a screwdriver.
Pointed here already, in particular - Valery: Make the power supply, including the rectifier, separately, and leave the batteries in place. 2 years ago, the battery on my Interskol cost almost half the price of the shurik himself.
Quote: pogranec
But you can’t buy the batteries themselves in the Chinese and, after disassembling the unit, change them?
About two years ago I looked at prices, it turned out that it was better to immediately buy an assembled battery in Russia a little more expensive, but with a guarantee and without hemorrhoids with welding.
0
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Unfortunately, even though there are no bones, they break them. And this is a medical fact. ((
+1
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I just wrote about replacing the batteries and immediately 2 posts on the import site came across.Strongly did not delve into, but can be useful to someone. and
Author 0
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Quote: Valery
and yet, my transformer was not able to provide the screwdriver with current in full. He turned on it not bad, but, for example, he could not drive a hundredth screw without a battery. Why did he lie down on the shelf.)))))
So, the author, you are a little soul-breaking))))). After the alteration, it is suitable only as an electric screwdriver - for easy work. your trance is even weaker than mine ...

I agree that this is just an electric screwdriver.
+1
Reply To quote A complaint
Redid and enjoy. Bad, good, but how much is enough. What choice? Throw away or buy akb at the price of a screwdriver. But you can’t buy the batteries themselves in the Chinese and, after disassembling the unit, change them?
0
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there are no bones
+1
Reply To quote A complaint
With a fool, as you know, it is possible and .... to break everything ...))))) But, in fact, no one really heard about the fracture of HIS.)))))
+1
Reply To quote A complaint
As for the "fire hazard" - I do not agree with the "critics". It won’t reach inter-turn. When the shurik "locks", the button is usually released. No one will hold her for a long time with the engine stopped. Namely, in this mode, maximum currents will appear.
+3
Reply To quote A complaint
and yet, my transformer was not able to provide the screwdriver with current in full. He turned on it not bad, but, for example, he could not drive a hundredth screw without a battery. Why did he lie down on the shelf.)))))
So, the author, you are a little soul-breaking))))). After the alteration, it is suitable only as an electric screwdriver - for easy work. your trance is even weaker than mine ...
0
Reply To quote A complaint
Quote: To Delusam
Well, if only in terms of power, then the TCEs did not go far from the TVZ.
Perhaps, in some ways you are right, some TCEs are close in power to the most powerful TVZ.
-1
Reply To quote A complaint
TCEs are far from TVZ.
But TCEs without rewinding are used in BP, but TVZs are not.
Yes, and fuel assemblies from lamp to pulsed, is that too ?!
Not a fuel assembly, but only its core and constricting elements, removing the non-magnetic gap if necessary.
+2
Reply To quote A complaint
Quote: Ivan_Pokhmelev
You cannot attribute it to powerful ones, but I only wrote about such ones.

Well, if only in terms of power, then the TCEs did not go far from the TVZ. Yes, and watching what TV. Yes, and fuel assemblies from lamp to pulsed, is that too ?!
0
Reply To quote A complaint
You cannot attribute it to powerful ones, but I only wrote about such ones. And for the little things, there was, for example, an isolation transformer at the line scan input.
If you use TVZ for power supply, then you need to completely rewind it, that is, use only iron. A fuel assembly core can be used in pulsed power supplies.
+1
Reply To quote A complaint
Quote: Ivan_Pokhmelev
In lamp TVs there were 3 powerful transformers: main (for rectifiers of supply voltages), TVK (which can quite successfully be used without rewinding to obtain voltages of the order of 10 ... 20 V from the mains voltage) and fuel assemblies (this one is not suitable for use as a power )

There is another transformer sound TVZ.
0
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Valery, this is the main power trance.
-1
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Visually in my box what?
0
Reply To quote A complaint
I, as an amateur, looked to make the magnetic circuit more massive. I connected the primary, measured it on the secondary side, and then - either looked for the one I needed there, or unwound / reeled it up.)))))
-1
Reply To quote A complaint
In lamp TVs there were 3 powerful transformers: main (for rectifiers of supply voltages), TVK (which can quite successfully be used without rewinding to obtain voltages of the order of 10 ... 20 V from the mains voltage) and fuel assemblies (this one is not suitable for use as a power )
0
Reply To quote A complaint
In the 90s there was a "general release" of lamp TV sets. So I picked out transformers from them. (I'm an amateur in this.I don’t know what they are called. But they have a large magnetic circuit and this was attractive). Then he shook his secondary. And on this, I remember, I did not shake it - so I found 12 Volts .... Or assembled, I do not remember ....
0
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Quote: arbuzny
The transformer was rewound. If you look closely at the photo, you can see that the connection is not on the voltage.

No matter how you rewind, and the power is greater than the iron allows, you can not do it. And no matter how you rewind, the amplitude of the sine wave to the root of two is greater than the effective value.
0
Reply To quote A complaint
Yes, cheap Saturn))

It didn’t work for me from the cable either, apparently the charge current is very weak.

And he shaves well, I just sit at the computer, then I shave, then I correspond with someone, but it all works smile Well, depending on which stubble, of course ... I shaved once after a week, the beard was already there, pulled without problems. And on the battery skidded, although where there ... the scalp was removed))

Does not feel the load at all ...
+2
Reply To quote A complaint
Apparently they put the battery weaker in order to maximize the engine life ...?
No ... Everything is more trivial. They are put because they are cheaper ... The main thing for the Chinese is to sell ... And how it will work there .... This is the third thing. It is necessary that she buzzed when buying and that’s all ... (Or is it not KETAI? .. Then it’s interesting ... I have a “Brown” and didn’t notice this ...)
And under load, most likely, your 5V becomes three ... The thing is most likely in the current, and not in the voltage ...
It shaves well and does not heat for hours at all.
blush
Somehow the information doesn’t fit in that it “perfectly shaves” with the fact that it takes hours ...: anguished: It takes me a minute to shave ... Even when I have to shave, I also fit in a minute. (I do not like her, respectively, I use her somewhere “on the road.” That is, it is from the battery.). I did not disassemble, but it works the same from the cord, and from the battery ... Although, maybe it is designed as my screwdriver!)))). Cord - only recharging the battery ...
0
Reply To quote A complaint
I noticed that the batteries are often put much weaker than required. I have a 2.3V battery in the electric shaver. On it, even a new one, it twists sluggishly and dies quickly. I wanted to throw it away, but no ... I disassembled it, supplied 5V power from USB, and began to work like a beast. It shaves well and does not heat for hours at all. I've been using it for half a year now.

Apparently they put the battery weaker in order to maximize the engine life ...?
Author 0
Reply To quote A complaint
Quote: Paganel
I would like to see this miracle not at work ... What did the author learn at school? )))) How from an alternating current of 21 volts after rectification can get 19 ???? : smiley: Coefficient of 1.4 (21 * 1.4 = 29.4 Volts). If the author has learned to use a multimeter, then he is not an electrician yet))) smile Feeding a speed regulator with a pulsating 29 volts - a circuit based on a triac is a bad idea, although the motor itself does not care. If only I installed an electrolytic conductor at 2200 microfarads of 50 volts to smooth out the ripples. Such a trance in the photo will give out 0.063 volts-amperes, and 24 volts, if I am not mistaken, I have such on the laboratory power supply, that is roughly 63 watts. (!) If the battery is 18 volts, and at the time of tightening the screw, the consumption of the screw reaches 400 watts (!), Then dividing 400 by 12, we will have 22 amperes. 22 Amp, Carl !!! And if there are ten or more screws? And not drywall, but a dry tree? The battery will give such an amperage for a short time, but trance is a big question)))) the winding will overheat, an interturn circuit will result. The wires going from trance to shurik, in the photo no more than 2x1.5 mm copper, can withstand a maximum of 12 amperes, half from 22, they will bask like a boiler. Author, teach the materiel ... Akum’s weight has disappeared and is not compensated for by anything, the tool is now unbalanced, the hand will tire of holding the motor overweight over the handle. Jamb on the jamb. Oh ...

The transformer was rewound. If you look closely at the photo, you can see that the connection is not on voltage.
+1
Reply To quote A complaint
Then there was the thought of removing the “pistol grip” and making it a “stationary electric screwdriver” in the basement, where I “do it myself” in winter - there I have “powerful” 12 volts in the form of two 180 Ampere batteries, which are always recharged when it is turned on light, and if it disappears, they serve through a two-kilowatt converter, as a source of backup power and power for diode lighting. (This basement is located under a nine-story building and sometimes the light in it disappears for a week until an electrician arrives (the machine is in his closet)))).
Yes, and did not get his hands ....
And as a screwdriver, I don’t need it for a long time - this good enough for 220 Volts and lithium ....
+1
Reply To quote A complaint
As I already wrote, I collected it in one evening to finish the work ... So, do not judge strictly, I collected from what it was, I bought only a bridge. He wrote, in my opinion, that he didn’t throw out the batteries then - he inserted the “battery cut-off”, “parallel operation” toggle-switch, He fed the batteries until I turned them on. And if they are cased, but it is necessary to twist, then I cut them off - then they did not take it for themselves and it "worked faster". But still not as brisk as on batteries, although the trance seems to be more powerful (from a lamp TV.)
+2
Reply To quote A complaint
And here's what's inside:
+1
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And here is his "Pitalovo"
+1
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And here he is mine !!!! Alive, dope!)))) ... I haven’t seen him for ten years !!! But he, it turns out, is standing on a shelf in the basement ...
-1
Reply To quote A complaint
Quote: arbuzny
But everything works, how else to prove.

At part load, with mass imbalance, with a slaughter mode for the motor and transformer - yes, it works. But this does not mean that it is correct and safe. To you Paganel laid out everything on the shelves.
P.S. There are people who include a second tee in one tee, and an iron in it and they also say: "Well, everything works!"
+1
Reply To quote A complaint
And this screwdriver is not Chinese.

Are there others? )))))
In fact, the Lord God only created heaven and earth, the rest was done by the Chinese! ))))))))
... You should distinguish only "China" (quality things) and "China" ...))))))
By the way, he recently disassembled the "green Bosch" .... It was the original, not the "Ketai" ... So, there are no bearings on the spindle either in the drill or in the grinder (!!!!) !!!! ... Here you have the "household series" ... Better I will continue to use the "Farm", "Blaukraft", "Angel" and other cheap ... There you can even change the bearings ....
-1
Reply To quote A complaint
Quote: arbuzny
And this screwdriver is not Chinese.
You don’t understand what people are talking about here. You can continue to be confused that physical laws can be neglected. ((
Author -2
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Add something of your own. And this screwdriver is not Chinese. Something other than a discussion of spelling errors and clever, nothing is visible.
-2
Reply To quote A complaint
Quote: arbuzny
Stop discussing off topic with smart sayings.

And what is off topic here? And we will leave silly statements for another case.
Quote: arbuzny
Try and make sure everything works.
I saw Chinese drills with plastic plain bearings. They can also work out for half an hour, but this does not mean that they can be bought.
Author +1
Reply To quote A complaint
If people put the mittens there, it means a useful and working home-made. Offer the best option. And try to throw it on the site. Besides the electronic power supply.
Author 0
Reply To quote A complaint
Stop discussing off topic with clever sayings. Try and make sure everything works. Fuse is understandable, it would not hurt .. This also applies to you (I'm doing)
+1
Reply To quote A complaint
Quote: Ivan_Pokhmelev
A personality no one discusses the author,



Quote: To Delusam
I’m forbidden personally criticize the authors of the project.


Personally and Personally (which only knows how to minus indiscriminately) things are different.
Author +2
Reply To quote A complaint
But everything works, how else to prove.
0
Reply To quote A complaint
And no one discusses the author’s personality, there is only a warning to those who try to repeat this “invention”. And it, among other things, is fire hazard, since the trance is not protected by a fuse, and it will work in extremely hard mode.
+1
Reply To quote A complaint
blush Threw ten !!! "mittens" and smeared on the wall. So in the end, what's the conclusion?
Quote: To Delusam
In general, the transformer the whole thing "spoils".

But I did warn you at the very beginning of the post, it’s forbidden for me personally to criticize the authors of the project.
-4
Reply To quote A complaint
Everything in the case is said, with the exception of the controller on the triac: where is it from direct current? There is a PWM controller, and the power element, most likely, is a powerful field worker. And the fact that the motor does not care about the maximum current, one and a half times higher than the nominal value, is doubtful.
+6
Reply To quote A complaint
I would like to see this miracle not at work ... What did the author learn at school? )))) How from an alternating current of 21 volts after rectification can get 19 ???? : smiley: Coefficient of 1.4 (21 * 1.4 = 29.4 Volts). If the author has learned to use a multimeter, then he is not an electrician yet))) smile Feeding a speed regulator with a pulsating 29 volts - a circuit based on a triac is a bad idea, although the motor itself does not care. If only I installed an electrolytic conductor at 2200 microfarads of 50 volts to smooth out the ripples. Such a trance in the photo will give out 0.063 volts-amperes, and 24 volts, if I am not mistaken, I have such on the laboratory power supply, that is roughly 63 watts. (!) If the battery is 18 volts, and at the time of tightening the screw, the consumption of the screw reaches 400 watts (!), Then dividing 400 by 12, we will have 22 amperes. 22 Amp, Carl !!! And if there are ten or more screws? And not drywall, but a dry tree? The battery will give such an amperage for a short time, but trance is a big question)))) the winding will overheat, an interturn circuit will result. The wires going from trance to shurik, in the photo no more than 2x1.5 mm copper, can withstand a maximum of 12 amperes, half from 22, they will bask like a boiler. Author, teach the materiel ... Akum’s weight has disappeared and is not compensated for by anything, the tool is now unbalanced, the hand will tire of holding the motor overweight over the handle. Jamb on the jamb. Oh ...
+1
Reply To quote A complaint
Perhaps the motor protects that under load a relatively low-power trans (63 VA) is overloaded and the motor current is limited. True, the trance will overheat. ((
+4
Reply To quote A complaint
When building a summer cottage (it was in the 90s) he used the same cheap screwdriver bought in Frankfurt for sale for 12 (!!!) marks. )))). Only he was 12 volt. By that time, the battery was almost dead. He was missed. Then one evening I built a power supply unit from a television transformer and exactly the same as you have in your photo of a diode bridge of 25 Amps. (They were already then !!! On the way from the construction site, I drove into a radio parts store to buy diodes. And there I found out about the existence of such compact bridges for high current. Of course I bought it). Only I mounted in the battery case not a bridge, but a connector. But I didn’t throw out the batteries. I soldered a long cord from ШВВП 2 of 0.5, and placed the block in a plywood box. The battery connected to the unit was charged if I did not work. And, if the cord somewhere on the roof interfered with me, I threw back the connector and the recharged dead battery allowed me to twist a little ....
This lantern box is now somewhere in the basement ... I’ll click on the case.))))
+2
Reply To quote A complaint
I would use an electronic transformer, compact and will give enough power when remodeling.
Here is a site about remaking and how to buy an almost finished block.

When I did myself a charge for 12 volts to 10 A.
+4
Reply To quote A complaint
For this case, it is more convenient to apply such an assembly. In general, the transformer spoils the whole thing.
+8
Reply To quote A complaint
How did the 21 V breaks after the bridge idle make 19 V? It should have been 28 V. And it would have been if you connected even a small electrolyte. In fact, you energize the electric motor with a pulsating voltage with an amplitude of about 26 ... 27 V.Don't know if this is good for the engine? It seems to me that not very.

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