Switch visible at night. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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To perform the backlight, a neon lamp of the TL type is used, connected in series with a resistor of 150 ... 200 kOhm to break the switch contacts (Fig. 1). The neon indicator will only glow when the lights are off.
Ris.1
For installation, we use a thick (1 ... 1,5 mm in diameter) single-core copper wire, which will allow it to be used as an element for fastening the backlight assembly to the terminals of the corresponding switch contact group.
In order for the backlight to be uniform and beautiful, part of the key must be sealed on the inside of the surface with an opaque material (for example, metal foil).
Other neon bulbs are also suitable, while the backlight may have different colors, depending on the type of HL1 neon indicator used. So, if you take TLZ-1-1, then there will be a greenish backlight, TLO-1-1 - orange, TLG-1-1 - blue.
There is a second way to make the location of the switch visible at night. On fig. 2 shows the circuit for turning on the indicator LED. But in this case, you will need to make a hole in the switch housing to secure the LED. Yes, and it contains more elements.
Ris.2
Applied parts are suitable for any type, small-sized.
Both circuits work only when the SA1 switch is off and there is a working lamp. The lighting lamp can be of any power.
The power consumed by the indicators when the backlight is on is not more than 0,37 W (for a circuit with "neon" it is even less), which will be imperceptible when paying for electricity monthly
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