Battery Condition Indicator Circuit
#battery monitoring
#voltage indicator
#LED indicator
#charge level
#battery health
#low battery warning
#voltage sensor
#portable devices
#energy management
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Maximum Minimum Voltage Indicator
This circuit indicates which of three voltages in the range from approximately -4V to +4V at points A, B, and C is the highest by illuminating one of three indicators.
The circuit is designed to compare three input voltages, labeled A,...
Battery charging indicator circuit
This simple circuit can be used to monitor whether a battery is charging. The voltage comparator IC LM393 is the core component of this circuit. The LED D1 will remain ON whenever there is at least 25 milliampere current flowing...
Ten-step voltage-level indicator
This ten-step adjustable analog level detector is capable of sinking up to 40 milliamperes at each output. The voltage range at the input pin should range from 0 to 2 volts. Circuits of this type are useful as liquid-level indicators,...
Supply Voltage Indicator
A novel supply voltage monitor which uses a LED to show the status of a power supply. This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): as long as the...
Voltage-level-indicator
A tricolor LED serves as the visual indicator for voltage levels. The voltage to be measured is connected to two comparators in parallel. The first 20-KΩ trimmer sets a reference voltage between ±5 V, establishing the full-scale reference value. The...
maximum minimum voltage indicator
This circuit indicates which of three voltages, ranging from approximately -4V to +4V at points A, B, and C, is the highest by illuminating one of three indicator LEDs. Alternatively, it can be configured to indicate the lowest of the...
3.6 Volt cell phone battery meter circuit
This circuit functions similarly to the previous one and features a 4 LED bar graph that displays the voltage of a common 3.6-volt lithium-ion rechargeable cell phone battery. The reference voltage is supplied by a TL431 programmable voltage source, which...
Voltage-Level Indicator
The three-terminal regulator device (LM78LXX) provides an output voltage (Vout) equal to the input voltage (Vm) until the input voltage exceeds the output voltage by 1.5 to 2 volts. A regulated voltage (Vreg) is achieved at this point, with a...
Maximum Minimum Voltage Indicator
This circuit indicates which of three voltages, ranging from approximately -4V to +4V at points A, B, and C, is the highest by illuminating one of three indicator LEDs. It can also be configured to indicate the lowest of the...