4.5V -3.10v,3Led voltmeter,Urgent Please. - Electronic Circuits Projects Diagrams Free

ferenzzo · 3rd April 2008, 01:03 PM

Hi there.
I want to build a Low voltage,3 led volt meter that starts measurements at 4.5v and downwards
I have 3 alkaline batteries 1.5v, total of 4.5v that I need to monitor.
I want all the power supply for the circuit drawn from the existing 4.5v that I have (I can not supply it by other batteries or power source due to that space is a matter.)
And when the voltage drops at the lowest value, then again the voltmeter should power it self from the existing pack, lowest voltage that would be
3.10v.

4.5v-3.80v green led,
3.70v-3.40v yellow,
And 3.30v-3.10v red.
Any help would be appreciated.
Thanks.

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3rd April 2008, 01:03 PM	(permalink)
ferenzzo	4.5V -3.10v,3Led voltmeter,Urgent Please. Hi there. I want to build a Low voltage,3 led volt meter that starts measurements at 4.5v and downwards I have 3 alkaline batteries 1.5v, total of 4.5v that I need to monitor. I want all the power supply for the circuit drawn from the existing 4.5v that I have (I can not supply it by other batteries or power source due to that space is a matter.) And when the voltage drops at the lowest value, then again the voltmeter should power it self from the existing pack, lowest voltage that would be 3.10v. 4.5v-3.80v green led, 3.70v-3.40v yellow, And 3.30v-3.10v red. Any help would be appreciated. Thanks.