Battery Charger
This high-performance charger quickly charges gelled lead-acid batteries, and turns off at full charge. At first, the charg...
Portable Nicad Charger
The portable charger is intended primarily to give model enthusiasts the opportunity of charging their Nicad batteri...
Low-voltage-indicator
Input terminal VIN is connected to the +V line of tbe circuit that the indicator is to monitor, and the grounds of botb circuits are connected togetber. The ...
Battery-capacity-tester
The test circuit gives an indication of the capacity remaining in a battery. By noting the time in seconds that the LED remains on after you depress the test s...
Low-battery-warnlng-disconnector
NiCad batteries are excellent rechargeable power sources for portable equipment, but ~care must be taken to ensure that the batteries are not damaged by overdi...
Low-battery-protector-
To prevent battery damage due to over -disc barge, a low-voltage detector and switch should be included in the design of the battery backup circuit. The detecto...
Nicad-batterv-analyzer
Because NiCad batteries maintain a constant output voltage, it is difficult to determine how much of the battery"s charge remains. The circuit provides a way of...
9-V-battery-life-extender
Circuit provides a minimum of 7 V until the 9-V battery voltage falls to less than 2 V. When the battery voltage is above 7 V, the MAX630"s IC pin is low, putt...
Nicad-batterv-protection-circuit
If a NiCad battery is discharged to a point at which the lowest capacity cell becomes fully discharged and reverses polarity, that cell will usually short inter...
Deactivating-battery-sensor
The sensing circuit rapidly disconnects the battery voltage and load whenever the voltage drops below a preset threshold. One-way operation prevents the circui...
Low-battery-warning
A voltage divider consisting of Rl, R2, and R3 is used to set the input reference voltage below which the batteries are to be replaced. That reference voltage,...
Universal-battery-charger
The charger"s output voltage is adjustable and regulated, and has an adjustable constant-current charging circuit that makes it easy to use with most NiCad bat...
Portable-nicad-battery-charger
This circuit was designed to charge NiCad battery packs in the range of 4.8 to 15.6 V from a convenient remote power source, such as an automobile battery. Whe...
Ujt-battery-charger
This circuit will not work unless the battery to be charged is connected with proper polarity. The battery voltage controls the charger and when the battery ...
Universal-battery-charger
When power is applied to the circuit, SCRl is off, so there is no bias-current path to ground; thus, L~317 acts as a current regulator. The LM317 is umnected...
Lead-acid-battery-charger
This circuit furnishes an initial voltage of 2.5 V per cell at 25° C to rapidly charge a battery. The charging current decreases as the battery charges, and...
Put-battery-charger
A short-circuit-proof battery charger will provide an average charging current of about 8 A to a 12-V lead/acid storage battery. The charger circuit has an add...
Low battery indicator
The indicator flashes an LED when the battery voltage drops below a certain threshold. 2N4274 emitter-base junction serves as a zener which establishes about 6V...
Undervoltage indicator for battery equipment
Due to the low duty cycle of flashing LED, the average current drain is 1 mA or less. The NE555 will trigger the LED on when the monitored voltage falls to 12 v...
Low-voltage monitor
This circuit monitors the voltage of a battery and warns the operator when the battery voltage is below a preset level by tumingon an LED. The values are set fo...