Supply Voltage Monitor with 555 IC

This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will flash the LED1 when the supply voltage surpass preset level.  With flashing indicator, at least there will be two benefits, first, the power consumption will be lower since the indicator doesn’t have […]

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Battery Tester/Indicator/Monitor

This is a battery tester circuit.This circuit is used to indicate whether the level of a battery voltage is  normal, under-voltage, or over-voltage, very useful to make sure an electrical system will works properly. This circuit displays three classes of voltage level condition: high, low and normal. This circuit defines high level voltage if the voltage is more than 15 […]

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