Instead of a switch - carnations. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Instead of a switch - carnations. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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If you use this simple device in a room where light is needed for a short time, you can not only save electricity, but also change the light bulb less often.

When the device is turned on (Fig. 1), the capacitor C1 smoothly opens the transistor VT4 and the thyristor VS1, which in turn leads to a "soft" voltage supply to the HL1 lamp. The device is used as a corridor switch, where the light is needed only to open the door or take off the shoes. The device differs from corridor timers in that it does not contain a switch, and the touch pad is disguised as a regular carnation. The circuit does not need scarce parts, it has been working for me for 4 years without failure.

Instead of a switch - carnations

Circuit operation. If you touch (for more than 1 s) the sensor pad E1, then the charge of the capacitor C1 will lead to the flip of the trigger on transistors VT2, VT3, and the transistor VT4 will open. The burning time of the HL1 lamp is determined by the discharge time of the capacitor C2. Elements VD1 and C1 protect the transistor VT1 from breakdown and high-frequency interference.

Establishment reduced to the selection of the resistance of the resistor R2. This resistance depends on the length of the connecting wire from the resistor R1 to the “stud” and is selected so that the transistor VT1 is securely closed and passes current only when the sensor is touched

Design. All parts are placed on the board (Fig. 2) in a plastic box thyristor VS1 - on the board in a horizontal position, and the control electrode is connected to the VT4 emitter with a mounting wire.

Instead of a switch - carnations

The maximum length of a thin wire coming from the resistor R1 is 2 m. The power of the HL1 light bulb is not more than 100 W, otherwise you need to install the VS1 thyristor on the heat sink and use more powerful rectifier bridge diodes.

Author: V.B.Lovchuk, Ivano-Frankivsk

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