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Do it yourself adjustable power supply on the NE555

Electronics / Power supplies
Added 18 comments
The article tells and shows in photographs how to make do it yourself simple adjustable power supply. Such a device is useful for supplying direct current to various devices, such as computer coolers, with the ability to adjust the speed. Adjustment of illumination of incandescent lamps of 12 volts or LED dimmable lamps. Etc.

To begin, consider the scheme that we have to collect. This is a PWM controller circuit on a very common NE555 chip.
Regulator circuit

Nothing complicated and the details are the most common and cheap, especially if you buy them in China. Prepare the components.

We will need:

R1 and R2 resistors of 1 kΩ, R3 - 100 ohms,
R4 potentiometer 4.7 Kom,
C1 capacitor 1 Mkf 25 volts, C2 - 10n,
VD1, VD2, VD3 - diodes for example 1N4148 or any similar,
VT1 is an IRF630 transistor or the like,
NE555 chip or equivalent,
transformer 220 volts to 12 volts.

Select the power of the transformer based on your desire, what kind of load you will give it. The IRF630 transistor allows you to adjust the power to 10 amperes, if you need more, then choose another from this series. Depending on the planned load, you need to use the wires, which are marked in red on the diagram.

The power supply, which we will remodel.

I will connect one or two fans to the power supply unit and a power of 1000 mA is enough for me.
We disassemble the block.

As you can see in the photo, it consists of a 220 volt to 12 volt transformer, a rectifier bridge with four diodes and a smoothing capacitor. We solder the rectifier block - we do not need it. We put our rectifier unit, together with the regulator, on one board.

We will assemble the device on a circuit board (it’s more convenient and you don’t have to bother with making a printed circuit board, moreover, it’s very easy to fit it to the right size, just scratch it with an office knife and break it off). Fit the board to insert it into the power supply housing and you need to do it first.

We install the parts on the board, in accordance with the scheme, starting with the largest elements. This is a capacitor and potentiometer. We place them in the case and try to close the top cover, if anything does not interfere, then they will stand in the finished product. Solder with any flux and tin.

Next, install the following parts and solder them. And so, in turn, checking the scheme.

It is better to solder each part in turn, immediately after installation and reconciliation with the circuit.






During the assembly process, constantly check the diagram and everything will work well. The circuit does not need to be configured, and with serviceable parts and proper installation without errors, it starts working immediately after turning on the power.

A cooler connected to such a power supply changes revolutions from zero to maximum very smoothly with excellent linearity.
Good luck with your business.
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18 comments
+1
Reply To quote A complaint
Yes, it’s a shame that now young people think that it’s easier to buy everything, I recall Mitrofanushka from “Young Growth” - “Why do I need a geography-driver to take me to”.

The bad news is that such an opinion is simply IMPOSED by sales marketers. Few people believe that "the formation of the necessary public opinion" was, is and will always be !!! (And nothing to do with "conspiracy theory")))). We formed it for politics, for the global economy .. (What, in essence, is one and the same thing)))). And now “sold” dominates in everything ... And it comes to the seemingly absurd decisions that the people, oddly enough, “swallow”. Like the development of new concepts of "usefulness" and "worthlessness" and the release of new, "useful" goods for this business, as well as the formation of young people's opinions about "what is cool and what is a collective farm" ... With simultaneous "travel on the brain "for the fact that" BE - it does not matter! Important - LOOK !!! " (Read: "It doesn’t matter that YOU CAN - it is important that you HAVE!") ... So the youth are not trying to BE ABLE to do something! You can just "buy Chinese" and have it.
0
Reply To quote A complaint
Khatul Madan
Justification of the law, please: "To avoid personal injury
I suggest one more: "A large number of fires due to electrical wiring malfunctions!"
0
Reply To quote A complaint
Khatul Madan
Justification of the law, please: "To avoid personal injury
I also propose: "A large number of fires due to electrical wiring malfunctions!"
+2
Reply To quote A complaint
Khatul Madan
And God forbid you do it yourself, penalties will be applied
Recently, at work, one friend asked me for a wire for a floor lamp, he melted! I didn’t have it. Today he bragged about, carried out the Internet, asked the guys, they unwound 10 meters! After questioning him, I realized: UTP! The most it is for wiring! And you will be proud that the floor lamp has been repaired!
+2
Reply To quote A complaint
The main thing is that it works, click on the button - you will get the result!
To paraphrase a little - "pay - get the result." We are growing a consumer society. As there V. V. Vysotsky- "Do not think, with us is the one who decides everything for us." I won’t be surprised if a law is soon passed, according to which we will only have to call a qualified specialist to replace a blown bulb in our toilet. And God forbid you do it yourself, penalties will be applied. Justification of the law, please: "In order to avoid household injuries (falling off a stool, cuts with glass, well, and electric injuries, where would it be without them)."
0
Reply To quote A complaint
Kashkarovschina - numerous books by a certain Kashkarov, usually representing compilations from various sources, including not always reliable ones.
0
Reply To quote A complaint
Khatul Madan
I recall Mitrofanushka from "Young"
I agree, but only in part. And why do people actually need to know how this or that device works from the inside? The main thing is that it works, click on the button - you will get the result!
+3
Reply To quote A complaint
Everything was just that, so I subscribe to every word. He also led a part-time circle right after the army, and not because of money, but at the request of the director of the SUT, who began my modeling activity in the distant 70s.Yes, it’s a shame that now young people think that it’s easier to buy everything, I recall Mitrofanushka from “Young Growth” - “Why do I need a geography-driver to take me to”.
+1
Reply To quote A complaint
Quote: pogranec
... it turned out that collecting an echo sounder would be many times more expensive than buying ....

Of course. Serial production of a debugged design, cheap labor on the conveyor, parts at wholesale prices ...
+1
Reply To quote A complaint
this direction will die soon
son writes a diploma. The subject is "Fishfinder". In short, he calculated and it turned out that collecting an echo sounder would be many times more expensive than buying on Ali. Although, maybe not an indicator.
+4
Reply To quote A complaint
...,... What is it? And from myself.
In the very beginning of the 90s, when an engineer simply could not feed his family on his salary (thanks dear M.S.), I undertook to conduct part-time radio circles on the SUT. And he got involved, interestingly, although not in monetary terms. Led until 2014, a lot of friends in this industry. In the zero years, men decided - this direction will die soon. Why did they decide so - the boys stopped stealing radio components, interest disappeared. And so it is, before circles, except for SUT (now TSTU) were in TSTU (formerly the House of Pioneers), houses of culture and almost every school, now there are 100 thousand people in the city instead of 15 ... 20 circles, and then problems with the set, because the circle is paid, about 20 cu per month. But this is not the main thing - before it was possible to do something that no one had, if not immediately - color music, a radio transmitter, and a very powerful amp as much as 100 W, now you can buy all this.
+2
Reply To quote A complaint
Quote: SkyBark
In general, Great is felt the lack of at the present time full-fledged circles of electronics ....
So I wish all those present to learn physics, learn the ABC of electronics, and then try to tell others something. == So as not to do worse but not to teach nonsense.

I agree with that. Completely! And to the absence of circles I will add the reluctance to read books, of which there are now a great many and quite accessible. The main thing is not to read Kashkarovism, but the right books. And also the desire to get everything at once, without having assembled the multivibrator and the detector receiver, immediately solder the ULF watts for a hundred and, necessarily, a metal detector.))
+1
Reply To quote A complaint
Of course. And how would the fan control programs work, the same SpeedFan?
+1
Reply To quote A complaint
Ivan_Pokhmelev
Can you justify, a lover of low power?
By the way, four-pin, adjustable computer fans are controlled by pulses from the motherboard (video card) to the shutter of the field pole, which is in the power circuit, on the fan board. scratch
+1
Reply To quote A complaint
Quote: SkyBark
DO NOT use this device to power computer coolers that require a constant voltage. Well, only if the author obviously does not go to reduce the fan resource by several times.
Can you justify, a lover of low power?
Skybark 0
Reply To quote A complaint
Eeeeehhhhh ...: o)) Still spun up to answer here on the site ....
Vanyush, I look, you are one of the most adequate people here ... BUT. I see no point, frankly, in your questions, and indeed ..... - the public here, to put it mildly, is poorly educated. And gravitating to kagkaronike ....

Well, specifically to this little article ... - Well, what can I demand from the author, who claims
The device is useful for supplying direct current to various devices, such as computer coolers, with the ability to adjust the speed. Adjustment of illumination of incandescent lamps of 12 volts or LED dimmable lamps. Etc. ? A?

In order not to be just a “plug”, I will correct the author - it is NOT possible to power computer coolers that require a constant voltage. Well, only if the author obviously does not go to reduce the fan resource by several times. This construction feeds its "output" with PULSE. Which the consumer himself (the motor, for example, direct current) is obliged to smooth out in one way or another.
The same goes for dimmable LED lamps. Single LEDs and their "batteries" correctly calculated - as many as you like.

In general, Great is felt the lack of at the present time full-fledged circles of electronics ....
So I wish all those present to learn physics, learn the ABC of electronics, and then try to tell others something. == So as not to do worse but not to teach nonsense.

72!
+1
Reply To quote A complaint
Solder with any flux and tin.
It's you in vain - tin is very bad to solder.
+2
Reply To quote A complaint
potentiometer 4.7 com,
C1 capacitor 1 Mkf
Not Com, but kOhm, not Mkf, but mkF (or if you want to go abroad - mkF).
power up to 10 amperes,
power at 1000 mA
And school physics is weakabout to remember? ;)
We solder the rectifier block - we do not need it. Put your rectifier block,
Having said “A”, it is necessary to say “B”: what is your rectifier block? Why didn’t you like what was available?
just scratch with a clerical knife and break off
It’s even easier to cut with scissors for metal: faster and more accurately.
changes speed from zero to maximum very smoothly with excellent linearity.
How linearity was checked?

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