A simple voltage indicator. 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 voltage indicator with sound indication. The interval of the working glow of the LEDs is 0,8-1,0 volts, the operating voltage range is from 10 to 28 volts.
(click to enlarge)
The indicator provides a constant glow of the LEDs as the voltage on the battery rises.
Set the indicator to the required voltage to turn off the green and then yellow LEDs. The scope of such devices is very wide.
See other articles Section Measuring technology.
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