Low Cost Battery Condition Indicator
This design combines power-on and low-battery indication, can operate with any battery voltage up to 15V, has very low current drain (2mA or less) and cos.....
Lithium-Polymer Peak Charger
This circuit was developed to charge the Lithium-Polymer cells used in a model aircraft. Lithium-Polymer cells are incredibly lightweight compared to Ni-c.....
Lead-Acid-Battery Regulator For Solar Panel Systems
The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. Thi.....
IC Controlled Emergency Light With Charger Circuit
Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC co...
High-Current Battery Discharger
If you have a motley collection of 12V batteries in varying states of health, this simple circuit will allow you to easily check their capacity. It s basi.....
Float Charger For NiMH Cells
Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply volta.....
Flashing-LED Battery-Status Indicator Circuit
A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the user`s atte...
Circuit Project: 3V Low Battery Voltage Flasher
Many battery powered devices use two AA alkaline cells. Often you will not know when it is time to replace the batteries until the device powered by them.....
Car and Motorcycle Battery Tester
Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charge.....
Bike Battery Charger
This simple circuit allows a 12V battery pack to be charged via a bike generator. The generator is rated at 3W and with this voltage multiplier circuit pr.....
Battery Voltage Indicator
Monitors battery voltage, Three-LED Display Connecting this circuit to the battery of your vehicle, you will always know at a glance the approximate volta.....
Battery Tester Circuit Schematic
Is the battery empty, or is there something wrong with the device? That s always a difficult question when your walkman or some other battery-powered devi.....
Battery SaverCircuit
A small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also take...
Battery Equality Monitor Circuit Schematic
Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the su...
Battery Charger Regulator
Most off-the-shelf car battery chargers cannot not be left connected to the battery for long periods of time as over-charging and consequent battery damag.....
Battery Charger Display Using LT1639
The Over-the-Top type of operational amplifier is ideal for use as a current sense for battery charger applications. The design described here can be used.....
A Friendly Charger Schematic for Mobile Phones
Charges and protects your mobile phone from voltage spikes and short-circuit Most mobile chargers do not have current/voltage regulation or short-circuit.....
A 12V Car Charger For ASUS Eee Notebook
The ASUS Eee is a fantastic ultra-portable notebook with almost everything required for geeks (and nothing that isn t). Plus it features fantastic build q.....
12 Volt Car Battery Charger Circuit Schematic
Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load.....
Nickel-Cadmium (NiCd) Battery Charger
The circuit diagram shows a regular charger being powered by an AC input source, intended for charging batteries. This type of rechargeable batteries are.....