Batteries for Model Aircraft
A new type of NiMH battery known as HeCell has recently been developed, which is claimed to allow higher discharge rates than the conventional ones (about 12 - ...
1n5818 Solar Charger Controller
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12V Battery Checker Circuit
This is a 12V battery checker circuit that uses 3 LEDs that light up at their respective voltages. The red LED lights up when the battery voltage is between 8 t...
Load Disconnect Switch Circuit
Deep discharge can damage a rechargeable battery. By disconnecting the battery from its load, this circuit halts battery discharge at a predetermined level of ...
Relay Fuse For Battery Charges Circuit
Charged capacitor C3 and momentary pushbutton switch S2 are used to momentarily energize relay RE 2. The batteiy under charge energizes the relay to hold it cl...
Battery Test Circuit Circuit
Using this circuit, tiiree levels of voltage can be displayednormal (11 to 15 V), liigh (>15 V), and low (11 V). When the voltage is low, the LED glows stea...
Battery Watchdog Circuit
This circuit uses a pair of Zener diodes to monitor battery voltage of a 12-V battery. If below 11 V, 1)1 ceases to conduct, pin 3 of 102 goes high, setting FF...
Battery Tester Circuit
The battery tester uses four transistors and two LEDs to indicate the condition of any battery you want to test. Q3 and Q4 are connected in a Darlington config...
Intelligent Battery-Charging Circuit Circuit
Intended for a Nicad application this charging circuit can be used with a wide range of batteries. A low-battery detector is intended. The trip voltage is set ...
Battery Charger Circuit
The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You can select either charging method or an automatic mode that will...
Rf-Type Battery Charger Circuit
This type of charger couples RF from L2 to an external pickup coil. The pickup coil connects to a rectifier and battery to be charged. This idea is handy becau...
On Indicator
Battery-operated equipment can work on one set of batteries for a long time nowadays. However, if it is left on inadvertently,...
Nicad Battery Tester
This Nicad battery tester discharges the test battery at a rate of 500 mA. When the endpoint of 1 V (determined by set...
Battery Tester
This battery tester makes use of an LM3914 bar-graph driver IC. SI selects load on battery under test and programs the volta...
Battery-Temperature Sensing Nicad Charger
Two simple circuits permit Nicad charging of a battery based on temperature differences between t...
Low-Battery Detector
The battery low-voltage detector uses a CD4093 Schmitt trigger and a capacitor that acts as a 1-bit dynamic RAM. The c...
Battery-Saving Disconnect Switch
At a predetermined level of declining terminal voltage, the circuit disconnects the battery from the load ...
Charger Extends Lead-Acid Battery Life
The circuit furnishes an initial charging voltage of 2.5 V per cell at 25°C to rapidly charge a batt...
12Vdc Mobile Battery Charger
This circuit provides up to 20 V output from a 12-V automotive supply, to enable constant current charging o...
Current-Limited 6-V Charger
An LM317HV regulator is used as a current-limited charger. If current through R4 exceeds 0.6 A, Ql is biased on...