Due to the constant rising costs of utilities, including electricity becomes relevant and economical expenditure. Electric lighting in non-residential premises (e.g., closets, utility rooms, etc.) required most often for a minute or two to take out something you need or Vice versa — to put for safekeeping. But to turn off the lights often forget, and the bulb continues to burn without the need sometimes until the next visit of the premises.
The proposed device is a time switch that turns on the light for 1 — 1.5 minutes, and then it automatically extinguishes.
The device is connected in parallel to the regular light switch (SA) and in standby mode consumes virtually no power.
The figure shows the electrical circuit of the time relay. It contains: two transistor — VT1 and VT2 (КТ315Г), timing capacitor C1 and a resistor R2, a parametric stabilizer VD1 (КС168), optothyristor VS1 (ТО125-12,5), the control button SV1, two current-limiting resistors R1 and RZ, and others.