Due to the constant rise in price of utilities, including electricity becomes relevant and cost-effective spending. Electrical lighting in non-residential support spaces (e.g., in closets, utility rooms, etc.) required most often for a minute or two to take from there what you need or, conversely, to put for safekeeping. But off light often forget, and the lamp continues to burn without the need to sometimes next visit this room.
The proposed device is a time relay, which turns on the light for 1 - 1.5 minutes, and then it automatically extinguishes.
The device is connected in parallel to a regular light switch (SA) and the standby mode consumes little electricity.
The figure shows the electrical circuit of the time relay. It contains: two transistor VT1 and VТ2 (CTG), ramasadaya capacitor C1 and resistor R2, parametric voltage VD1 (X), obliterator VS1 (TO-12,5), the knob SВ1, two current limiting resistor R1 and R3, and others.
The device is simple. At the time of the first switching it on, the button B1 condenser C1 is discharged, and therefore the charging current supplied to the base composite emitter repeater. Both transistors are opened. In the emitter circuit of the transistor VT2 turns on the led that is inside obliterator. Led activates the turning on of the thyristor. The lamp lights up.
A circuit diagram time relay in the circuit of lighting auxiliary (non-residential) premises
Electric lamp with the device briefly turning on the light and two buttons with wires for a long utility room
After the time determined by the capacitance values of the capacitor C1 and resistor R2, transistors are closed. The lights go out. Re the inclusion of the secondary light is carried out by pressing the SIN. Capacitor discharged. Passing through it the charging current reopens transistors, and they can have obliterator. Light lights up again.
For ease of reference, for example, in the long room of the control buttons'SV may be two or more.
For long-time lighting is used, as usual, a regular switch SA.
Authors: J. Martin, L. Martina, Ekaterinburg