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Battery Monitors
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Battery Monitors: #-B
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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| Circuits Designed by Dave
Johnson, P.E. : |
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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. It use an inexpensive IC from
Panasonic that is connected to an efficient LED flashing circuit. When the
battery voltage drops below a certain point the circuit flashes the LED. In
the off state the circuit draws only 1uA, while in the active flashing state it
draws 20uA. Published in EDN, Jan 2, 1997
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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. (added
7/06)
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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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..... (added 5/09) |
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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] |
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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. |
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12 Volt Lead Acid Battery Monitor - This simple circuit makes it
possible to monitor charging process to a higher level….. [Tony van
Roon's circuit] |
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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....Published in EDN, Jan 2, 1997 [Designed
by David A. Johnson] |
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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…(project added 6/070 |
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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.... [Hobby Corner Circuit by Dave
Johnson] |
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A Battery Powered Lap Top Computer Power Supply - DN18 Design
Notes (Linear Technology) (app note added 2/06) |
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A Little More Serious Frequency Meter/CounterATtiny2313, AT90S2313 -
Maximum input frequency is specified to be 30 MHz in the multi-chip configuration,
and in single-chip configuration, there are both 5 MHz and 10 Mhz versions
operating with 10 and 20 MHz crystals, respectively. All versions have 9 1/2 digit
resolution. I have used....(schematic / circuit added 6/07) |
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A Pretty Good LC Meter Based on an AVR ATtiny2313, AT90S2313 -
(schematic / circuit added 6/07) |
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AB-32/ Battery Charger Applications - Fairchild Application Notes / (app
note added 6/06) |
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AB-33/ Battery Charger Applications - Fairchild Application Notes / (app
note added 6/06) |
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AB-34/ Battery Charger Applications - Fairchild Application Notes / (app
note added 6/06) |
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AN-4138/ Design Considerations for Battery Charger Using Green Mode Fairchild
Power Switch FPStm - Fairchild Application Notes / (app note added 6/06)
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Analog Circuit is Accurate Battery Fuel Gauge - Circuit acts as a fuel
monitor for a rechargeable battery, typically NiCd or NiMH chemistries. Analog
type needle output meter appears like an automobile gas gauge.… [Jim Haggerman,
Hagerman Technology LLC] |
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Automatic power-off circuit saves battery - 12/05/96 EDN-Design Ideas
You can use many techniques, such as using low-power ICs and low-power wait, stop,
or sleep modes, to minimize power. The small, simple power-off circuit in Figure
1demonstrates yet another power-saving approach. The circuit and a simple program
(Listing 1) can sense a �C system's lack of activity.... [Design Idea by Jose
Carlos Cossio, Santander, Spain] |
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Battery automatic power off has simpler design - 31-Mar-05 Issue of EDN
Simplified circuit provides timed battery cut-off to save power.... [Design Idea
by Yongping Xia, Navcom Technology, Torrance, CA; Edited by Brad Thompson] |
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