LM3914 battery monitor

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LM3914 battery monitor

Posted by: andrew ()

Date: June 26, 2003 09:30PM

parts:
U1 LM3914 Bar-Dot Generator IC
R1 100k ohm potentiometer
R2 1k ohm resistor
LED1-10 light emitting diodes

all resistors are 5 or 10 percent tolerance, 1/4-watt
this circuit should be powered by its own battery, otherwise you might get an innacurate reading. hook the to-be-monitored battery to pin 5 of the chip.

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Re: LM3914 battery monitor

Posted by: dougb ()

Date: September 02, 2005 09:14AM

Quote

(andrew @ June 26 2003,21:30):

parts:
U1 LM3914 Bar-Dot Generator IC
R1 100k ohm potentiometer
R2 1k ohm resistor
LED1-10 light emitting diodes

all resistors are 5 or 10 percent tolerance, 1/4-watt
this circuit should be powered by its own battery, otherwise you might get an innacurate reading. hook the to-be-monitored battery to pin 5 of the chip.

I prototyped the LM3914 battery monitor.

I used a 5v supply to power the circuit and I
am trying to monitor an 11.1vdc li-po battery.

Ialso have pin 9 connected to +5v.

I can't adjust anything.

Help

Doug B

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Re: LM3914 battery monitor

Posted by: SHELDONS TV ()

Date: December 14, 2005 07:40AM

you can also use an LM339 in this circuit which does the same job for less money wise....

Attachments: post-14-64048-voltmeter_2.gif (3.4 KB)

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Re: LM3914 battery monitor

Posted by: Mike ()

Date: May 22, 2006 10:32AM

Can any of these be modified for +24vdc?

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			Home Forum!! *Robotics Projects:* Smallbot *Electronics Projects:* SMT Reflow Serial Multiplexer *Project Log:* Current Projects My Bench Equipment				Battery Power Monitors : Reconn's World Forum Attention! If you would like to post, but don't want to create your own account, use login:guest password:rw -- Enjoy! Goto Topic: Previous•Next Goto: Forum List•Message List•New Topic•Search•Log In•Print View LM3914 battery monitor Posted by: andrew () Date: June 26, 2003 09:30PM parts: U1 LM3914 Bar-Dot Generator IC R1 100k ohm potentiometer R2 1k ohm resistor LED1-10 light emitting diodes all resistors are 5 or 10 percent tolerance, 1/4-watt this circuit should be powered by its own battery, otherwise you might get an innacurate reading. hook the to-be-monitored battery to pin 5 of the chip. Options: Reply•Quote Re: LM3914 battery monitor Posted by: dougb () Date: September 02, 2005 09:14AM Quote (andrew @ June 26 2003,21:30): parts: U1 LM3914 Bar-Dot Generator IC R1 100k ohm potentiometer R2 1k ohm resistor LED1-10 light emitting diodes all resistors are 5 or 10 percent tolerance, 1/4-watt this circuit should be powered by its own battery, otherwise you might get an innacurate reading. hook the to-be-monitored battery to pin 5 of the chip. I prototyped the LM3914 battery monitor. I used a 5v supply to power the circuit and I am trying to monitor an 11.1vdc li-po battery. Ialso have pin 9 connected to +5v. I can't adjust anything. Help Doug B Options: Reply•Quote Re: LM3914 battery monitor Posted by: SHELDONS TV () Date: December 14, 2005 07:40AM *you can also use an LM339 in this circuit which does the same job for less money wise....* Attachments: post-14-64048-voltmeter_2.gif (3.4 KB) Options: Reply•Quote Re: LM3914 battery monitor Posted by: Mike () Date: May 22, 2006 10:32AM Can any of these be modified for +24vdc? Options: Reply•Quote Goto: Forum List•Message List•Search•Log In Array Sorry, only registered users may post in this forum. Click here to login This forum powered by Phorum.