AL307 illuminates the scale. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Light-emitting diodes AL307V, AL307G can be used not only as light indicators, but also as illuminators. An example of such use is the illumination of the tuning scale of a small-sized transistor radio receiver, for example, assembled from the Yunost-202 set.
This receiver had one LED with a 330 ohm quenching resistor, which provided, at a supply voltage of 6 V, the current through the diode was slightly less than 20 mA.
The LED was located in the lower right corner of the scale. To do this, the polymer housing of the LED was slightly ground off on two opposite sides parallel to the plane of the leads, and a hole was made in the side wall of the scale niche in the receiver housing. Previously, a white matte paper with good light-scattering properties was glued to the bottom of the niche. An LED is inserted through the hole in the side wall and glued with the bottom plane, and the hole itself, through which the leads are passed, is filled with a solution of polystyrene in acetone.
For illumination, it is better to use the AL307G LED, the brightness of which is about 1,7 times higher than that of the AL307V.
The button to turn on the backlight is installed to the left of the scale - to the place where the power-on indication LED can be located. An MP-7 microswitch was used as a backlight switch, mounted on a printed circuit board using rigid conductors, which allows you to adjust the height of the microswitch push head.
If there is a scale of a larger area, compared to "Yunost-202", the number of LEDs can be increased by placing them evenly over the illuminated area.
Author: E. Solodnovnikov, Krasnodar
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