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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. 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.... (added 5/09) |
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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 electronic design added
05/09) |
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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. (added 7/06) ….(designed by David A. 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 - Unpublished 10/98 Circuit acts as
a fuel monitor for a rechargable battery, typically NiCd or NiMH chemistries. Analog
type needle output meter appears like an automobile gas gauge. (added 9/04) |
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Automatic Power Off Circuit Saves Battery - 12/05/96 EDN-Design Ideas:.....(design
idea added 9/04) |
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Battery Automatic Power Off has Simpler Design - 03/31/05 EDN-Design
Ideas:.....(design idea added 5/05) In low-noise analog circuits, a high-gain
amplifier serves at input to increase SNR. The input signal level determines
input-stage gain; low-level signals require highest gain. It is also standard
practice in low-noise analog-signal processing to make circuit's bandwidth as narrow
as possible to pass only useful input-signal spectrum.... (added 10/05) |
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Battery Charger Applications/ AB-32 - Fairchild Application Notes / (app note
added 6/06) |
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Battery Charger Applications/ AB-33 - Fairchild Application Notes / (app note
added 6/06) |
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Battery Charger Applications/ AB-34 - Fairchild Application Notes / (app note
added 6/06) |
