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Battery Monitors  Page 1
Battery Monitors:   #-B      C-D      E-L      M-Q      R-Z

Last Updated on:
Thursday, April 07, 2016 01:00 PM

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Circuits Designed by Dave Johnson, P.E. :
  • 12v Battery Voltage Monitor-Expanded Scale  -  The circuit below expands the battery voltage monitoring scale for a 12v battery so a more accurate voltage reading can be made. The numbers printed onto the face of a standard 0v to 5v meter are changed so the scale ranges from 10v to 15v . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]
     

  • 3 Volt Low Battery Voltage Flasher -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment . . . [Circuit by Dave Johnson P.E.,  01/01/98]

  • 6v NMH/NiCd Battery Tester -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions. As designed, the circuit applies a 10 amp load to the battery pack. A heat sink must be used on the main power transistor . . . [Circuit by David Johnson P.E.,  12/12/04] 

  • 9v Battery Voltage Monitor -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7. 2 volts. It uses a LTC1440 comparator, which also contains a 1. 18v reference diode. In standby mode, the circuit draws only 4uA . . . [Circuit by David A. Johnson P.E.,  07/09/06]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1.5v Battery Meter -  simple but effective way of testing 1. 5 volt cells. . .  [by P. Townshend - EduTek Ltd]

 

12 Volt Battery Charge Monitor -  Here is a battery monitor circuit which disconnects the load when the battery is discharged, preventing a deep discharge which could cause permanent battery damage. The battery is automatically reconnected when a battery charger or other DC source is connected across the load. Select a relay which requires less than 100ma coil current and with contacts capable of handling the load and charging. . .  [Charles Wenzel (unless otherwise noted)]

 

12 Volt Battery Low Indicator LM741 -  Plans for a battery low indicator for a 12 Volt battery using an LM741 operational Amplifier. . . .  [REUK-Renewable Energy UK website]

 

12 volt battery monitor -  R1 controls the trip-point of the circuit. when the voltage falls below the trip-point, the led lights. adjust it to the desired level. to use this circuit to monitor a 6v battery, substitute D1 for a 3. 3 volt zener diode and adjust R1 accordingly. . . .  [Andy Wilson's site]

 

12 Volt Lead Acid Battery Monitor -  This simple circuit makes it possible to monitorcharging process to a higher level. . . .  [Tony van Roon's circuit]

 

12V battery level indicator for car batteries -  This kit measures battery voltage. The red LED (closest to the IC) indicates a low status - 11. 5Volts or less. The yellow LED indicates 50% charge - 12. 0V. The green LED indicates 12. 6V or full charge. This kit also measures the charging status. Turn the charging system on - or start the vehicle. The red LED (at the extreme end from IC) indicates overcharge - 15. 5V. The green LED indicates maximum charge voltage - 14. 5V. The yellow LED indicates normal charging voltage - 13. 2V. . . .  [CdS Electronic's website]

 

12v Battery Voltage Monitor-Expanded Scale  -  The circuit below expands the battery voltage monitoring scale for a 12v battery so a more accurate voltage reading can be made. The numbers printed onto the face of a standard 0v to 5v meter are changed so the scale ranges from 10v to 15v . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]

 

12V Lead-Acid Battery Monitor using LM3914 -  This simple circuit makes it posible to monitor the charging process to a higher level. If you need more information then check out the LM3914 Datasheet. Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary accuracy. Connect an input voltage of 12. 65 volt between the positive and negative poles and adjust the 10K trimmer potentiometer until Led 10 lights up. Lower the voltage and in sequence all other Led's will light up. Check that Led 1 lights up at approximately 11. 89 volts. . . .  [Posted with permission of Jan Hamer]

 

3 Volt Low Battery Voltage Flasher -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment . . . [Circuit by Dave Johnson P.E.,  01/01/98]

 

300 MHz  Prescaler & 30 MHz preamp for Little More Serious Frequency Meter  -  A preamp that drives the CMOS counter input and a divide by 10 prescaler to extend the range. . .  [From Dick Cappels' project pages]

 

6v NMH/NiCd Battery Tester -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions. As designed, the circuit applies a 10 Amp load to the battery pack. A heat sink must be used on the main power transistor . . . [Circuit by David Johnson P.E.,  12/12/04]

 

9v Battery Voltage Monitor -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7. 2 volts. It uses a LTC1440 comparator, which also contains a 1. 18v reference diode. In standby mode, the circuit draws only 4uA . . . [Circuit by David A. Johnson P.E.,  07/09/06]

 

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Battery Monitors:   #-B      C-D      E-L      M-Q      R-Z


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