Garland on lamp and semiconductor indicators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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Amateurs involved in the disposal of old equipment accumulate a number of different LEDs.
From these LEDs, you can make small garlands for desktop Christmas trees. As switches for LED garlands, you can use old-fashioned neon lamps (Fig. 1) or special switching ones, for example, MTX-90, TX-04B and the like.
Such lamps can successfully switch most modern LEDs. Outdated LEDs are too "gluttonous" and do not shine well when the lamp switching is in good working order. The number of small-sized LEDs in each garland can reach 12, but the brightest element in the garland will, of course, be a neon lamp.
The capacitor may be electrolytic. It can be replaced by two capacitors of the same type with a capacity of 2 μPH50 V, connected in series (Fig. 2).
The number of garlands connected to one rectifier diode can reach 10 or more (one garland consumes a current of about 20 mA). The garlands in this scheme blink randomly, and the children do not get tired of looking at them.
The neon indicator lamp, despite its simplicity, is a dual-purpose device and, in addition to its direct functions, can perform the function of an automatic switch. So it's too early to send the lamps to the landfill and consign them to oblivion.
Author: Y. Bearded
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