New features of the old autotransformer. Drawing, description

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New features of the old autotransformer. Tips for the home master

Builder, home master

I purchased the ARB-250 adjusting household autotransformer in time immemorial, as they say, when it cost only 16 rubles. Immediately, without looking at the instruction manual and without connecting any load to the device, I "plugged" my purchase into the power grid ...

The result of such hasty actions was a fuse that burned out due to incorrect installation of the adjusting disk and a declining mood. Moreover, the latter was largely facilitated by the circumstance clarified during the repeated (correct) inclusion: the actual allowable adjustment limits for the ARB-250 are far from what was expected.

The autotransformer turned out to be out of work. The appearance of modern radio and television equipment (with built-in voltage stabilizers) threatened him with resignation. But then the "electric lamp shortage" struck. In an effort to make the operation of my 75-watt table lamp as easy as possible and extend its life, I resisted the temptation to solder something ultra-modern, thyristor-triac. Remembering the ARB-250, I began to think about how to adapt this autotransformer.

The resulting circuit diagram is shown in the figure. And for comparison, the previous one is given nearby. The main difference between the new circuit design and the old one immediately catches your eye: turning on the autotransformer, as it were, backwards, with two options for switching the "common" wire by introducing another element - the SA1 toggle switch.

New features of the old autotransformer
Old ARB-250 with new features: 1 - autotransformer in a standard case, modified; 2 - voltmeter on the LED matrix, standard; 3 disk with extended limits of variable parameters, adjusting; 4 - power cord

Schematic diagrams (click to enlarge): a - original; b - modified

All work on the alteration of the ARB-250 takes (personally verified) no more than 10 minutes. Basically, these are the costs of installing the TV2-1 toggle switch and isolating the former outlet that went to the load. But what a result! It is now possible to connect almost any household appliance to such a universal transformer - an alternating current consumer with a power supply voltage almost from zero to 250 V. It is not bad, in particular, to use a modified ARB-250 to obtain a "soft", "muffled" , or even smoothly variable (as in a movie theater) light from a sconce, table lamp or floor lamp. When the need arises, I use an autotransformer as a power source for my homemade 40V soldering iron and other "non-standard" loads.

Make yourself a similar device based on the ARB-250 - you won't regret it!

Author: S.Kondusov

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Comments on the article:

Sergei
You are a designer: why are you driving bullshit. If you look at your scheme (know-how), then there are a large number of turns in the primary than in the secondary. Where can 250 volts come from on the secondary, if there are 200 in the network, and the number of turns is more than in the secondary ..... have you retrained? Yes, there are only two ends to solder, and it turns out LATR with adjustment from zero to 250 volts.

Alexey
I confirm the voltage. 1 position 130-260 volts. 2 position 0,2-97 (depending on the network). True, the diagram is almost not accurately drawn

Igor
Truth! Why is the diagram almost exactly drawn?

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