Flashlight on the 555 series timer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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I offer a flashlight with white LEDs on a 555 series analog timer chip known to radio amateurs. It can be used to illuminate mounting in an "uncomfortable" place, as a pocket or bicycle lamp, etc.
The generator is the 555 timer, the domestic analogue of which is the KR1006VI1 microcircuit.
The generator frequency is about 100 Hz. At the output of the timer, a transistor switch VT1 is turned on, in the collector of which 3 white LEDs of the L-53PWC type from Kingbright are installed.
When the flashlight is turned on, the generator generates pulses that open the key and control the LEDs, which are powerful sources of light, but with little battery consumption.
The flashlight is assembled in the body of the previously produced Lantern BN-1-003, in which four R20(D) batteries serve as a power source. There is enough space inside to install the manufactured circuit.
The light emitter is made as follows. The LEDs are soldered to the base from a conventional light bulb of the LN-6,3 type (6,3 V, 0,3 A), which is screwed into the flashlight socket in the usual way. In principle, for the full implementation of the functions embedded in the flashlight, you need to make two such LED "light bulbs", since the flashlight has an additional light bulb (behind the frosted glass).
Author: P. Bobonich, Uzhhorod, Ukraine
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