Step down extension. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Step down extension. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / electrician's tool

When performing various household chores, it sometimes becomes necessary to have on hand a source of electricity with a lower voltage than in a conventional network. For example, to illuminate the water in the aquarium (to save the light bulb from premature burnout of the filament), etc.

In all these cases, a convenient "step-down" extension cable with two sockets will help out, one of which is connected through a diode: it "cuts off" each negative half-wave, leaving behind only half of the previous voltage.

step down extension
Figure 1. Schematic diagram of the "step-down" extension cord

It is best to make such an extension cord - "transformer" based on sockets for external electrical wiring, preferably square in shape (although others will do). You will also need a socket made of insulating material (textolite, plexiglass, plywood, etc.) The sockets are mounted on it with M4x30 screws with nuts, and diodes KD6,5B or D206 are installed in a hole with a diameter of 246 mm (other types can also be used; it is only important, so that the maximum allowable current for which they are designed, as well as the maximum reverse voltage, are not less than 10 A and 400 V, respectively).

step down extension
Rice. 2. Socket box

In order not to accidentally confuse the sockets during the operation of the extension cord, it is advisable to have them painted in different, contrasting colors. Or at least make an appropriate mark on one of the protective covers.

Author: V.Burlov

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