Hi,
I need to have an LED turning on when there's current flowing through a device. Consider an electronic gadget, e.g. an MP3 player and its battery. This MP3 player draws approx. 25 mA in standby but hundreds of mA during operation. The LED (and its circuit) will be installed between the battery and the gadget and I'd like it to turn on whenever the gadget is not in standby, i.e. the current is above a certain threshold (let's say 50mA)
Some of the specifics are:
Battery: 3.7V to 4.2V, depending on charge
Standby current: approx. 25mA
Operation current: 75mA to 400mA
Desired LED current: 10mA (Vf = 2.8 to 3.0V)
Thank you!
I need to have an LED turning on when there's current flowing through a device. Consider an electronic gadget, e.g. an MP3 player and its battery. This MP3 player draws approx. 25 mA in standby but hundreds of mA during operation. The LED (and its circuit) will be installed between the battery and the gadget and I'd like it to turn on whenever the gadget is not in standby, i.e. the current is above a certain threshold (let's say 50mA)
Some of the specifics are:
Battery: 3.7V to 4.2V, depending on charge
Standby current: approx. 25mA
Operation current: 75mA to 400mA
Desired LED current: 10mA (Vf = 2.8 to 3.0V)
Thank you!
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