Supply Voltage Indicator

  
This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): as long as the indicator has good 12 volts at its input, LED1 gives steady, uninterrupted (for the naked eye) yellow light. If the input voltage falls below 11 V, LED1 will start to blink and the blinking will just get slower and slower if the voltage drops further - giving very clear and intuitive representation of the supply`s status. The blinking will stop and LED1 will finally go out at a little below 9 volts.
Supply Voltage Indicator - schematic




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