Battery status indicator with sound indication. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The circuit shown in the figure above is a simple battery status voltage indicator with audible indication.
(click to enlarge)
The interval of the working glow of the LEDs is 0,8 - 1,0 volts, the lower level of the indicated voltage is 12 - 12,8 volts, the average level is 13,0 - 13,9 volts, the upper voltage level is 13,8 - 14,4 volts. The level of operation of the sound indication, signaling a low voltage on the battery 10,5 - 10,2 volts. The indicator provides sequential switching on of the LEDs as the voltage on the battery rises.
The scope of such devices is very wide.
See other articles Section Measuring technology.
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