Illumination for the switch. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Illumination for the switch. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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Coming home in the evening, in complete darkness, you start looking for a switch in the corridor to turn on the light without touching the mirror or something else. Probably many people have experienced this. Therefore, I decided to make a backlight for the switch, which works constantly and does not consume a lot of electricity.

Illumination circuit for the switch

The scheme of the proposed device is assembled from only two parts, it will not be difficult even for a novice electronics engineer to assemble it. At the heart of the circuit (see figure) is a neon lamp L2. When the lamp is off, the current passes through the filament of its lamp L1 and through the resistance R1, on which more than half the voltage is extinguished, and enters the neon L2. At the same time, the neon lamp glows. As soon as the contacts of the switch S1 are closed, the neon goes out and the lamp in your corridor turns on.

Any neon lamp, better than imported (it is smaller). The resistance may differ from the nominal one, the brightness of the neon glow depends on it: the greater the resistance, the lower the brightness and vice versa. It is important that the wattage of the resistance is not less than 0.25 W (0.5 W in the diagram).

The device is connected in parallel with the contacts of the switch and placed directly in it. Where to make a neon hole in the switch is up to you.

This scheme has been working for me for more than five years, it consumes a minimum, well, maybe it will make the counter one revolution per month in favor of the neon, and then I doubt it.

Author: Vladimir Drygalkin, LENIN INC, Ukraine; Publication: N. Bolshakov, rf.atnn.ru

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