Coming home at night, in complete darkness begin to look for the switch in the hallway to turn on the light and not to touch the mirror or something. Probably many have faced this problem. So I decided to make the backlight for the switchthat operates continuously and does not consume a lot of electricity.
Diagram of the device is assembled of two parts, to collect it is not difficult, even a novice with electronics. The circuit is based on (see the picture) neon lamp L2. When the lamp current passes through the filament of lamp L1 and through the resistance R1, which suppressed more than half the voltage, and entered neeku L2. Thus the neon lamp to glow. As soon as the switch contacts S1 are closed neon dims and turns on the lamp in Your hallway.
Neon lamp any better imported (it is smaller). Resistance can differ from the nominal one, it determines the brightness of Naoki: the more resistance, the less the brightness and Vice versa. It is important that the wattage of the resistance was not less than 0.25 W (0.5 W).
The device is connected parallel to the contacts of the switch and is placed directly in it. Where to make a hole for Naoki in the switch You decide.
I have this scheme works for more than five years, consumes minimum, maybe I'll make a counter one revolution per month in favour of Naoki, and doubt.
Publication: www.rp.butovonet.ru, www.cxem.net