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Battery Charger Circuits
Nicad Charger Uses Voltage Cut-Out
This circuit charges two NiCad cells with a constant current and features dual charging rates, voltage cutoff and an audible alarm. The circuit is powered..
NiMH Charger For Up To Six Cells
The circuit presented here is intended for charging NiMH batteries. The MAX712 IC used here contains all the necessary functionality to make sure that this happens in a controlled manner. Figure 1 shows the schematic of the charger. The heart of the circuit is easily recognized: everything is arranged around IC1, a MAX712 from Maxim. This IC is...
Simple Battery Charger Circuit Charges Upto 12 NiCD Cells
This handy circuit can be used to charge from one to 12 NiCd cells from a car battery. Up to six cells can be charged with switch S1 in the normal posit..
Simple NiCd Battery Charger
A simple NiCd charger can be built using junk box components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3..
Solar Panel Based Charger And Small LED Lamp
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of d..
Solar-Powered High Efficiency Battery Charger
This is a simple NiCd battery charger powered by solar cells. A solar cell panel or an array of solar cells can charge a battery at more than 80 % efficie..
Switchless NiCd-NiMH Battery Charger
This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will event..
USB Powered Mobile Phone Battery Charger
This simple circuit can give regulated 4. 7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3. 6 volts at 1000 to 1300 mAh. These battery packs have 3 NiMh or Lithium cells having 1. 2 volt rating. Usually...
36V battery charger
I need a constant voltage 44V, 1A max battery charger. This will be built into the battery compartment of an e-bike, and will be permanently connected to the three 1..
Best 12V battery charger circuit using LM311
The our best 12 Volt battery charger circuit, this is a charger circuit automatic system, then when the battery voltage is lower than specified, this circuit..
The most lead-acid battery charger circuit by LM317
When you want to build the lead-acid battery charger project for 6V battery or 12V. Although there are many methods to choose from. I like using IC LM317..
Battery charger using LM317 regulator circuit
As you can see in this schematic circuit this battery charger has extreme few components, but is doing a very good job. When power is applied to the circuit the SCR1 is off, so there is no bias-current path to ground. The LM317 is connected to the battery through diode D1, limiting resistor R1, and bias resistor R2. The D1 diode is used to preve
Cell phone charger circuit diagram FSEZ1307
This cell phone charger circuit diagram electronic project is based on the FSEZ1307 third-generation primary side regulation (PSR) PWM controller integrated circuit. The FEZ1307 cell phone charger can be used for battery chargers applications for devices like : cellular phones, cordless phones, PDA, digital cameras or for replacement of linear tr
CV/CC charger circuit diagram designed using LinKSwitch
A very simple 3. 25W CV/CC charger can be designed using LinKSwitch | family IC manufactured by Power Integrations. This electronic circuit project is designed to provide a 5 volts output at a maximum current of 650mA. This 3. 25W CV/CC charger, needs to be powered using a AC voltage between 85 and 265 VAC. The AC input power is rectified by dio
Lithium battery charger schematic circuit design using LTM8061 IC
A very simple and efficiency Lithium battery charger and monitoring system, can be designed using the LTM8061 integrated circuit, designed by Linear Technology. The LTM8061 IC is a high efficiency 32V, 2A Module standalone Lithium battery charger optimized for one and two-cell packs, with fixed float voltage options: 4. 1V, 4. 2V, 8. 2V and 8. 4V
LNK616PG 5 volt constant charger circuit design electronic project
A very simple 5 volt constant voltage, constant current (CV/CC) universal-input power supply for cell phone or similar charger applications can be designed using the LNK616PG product from the LinkSwitch-II family. As you can see in the circuit diagram, this low cost charger, adapter accepts a wide range of input voltage, from 85 VAC up to 265 VA
LTC1042 wind charger circuit schematic project
This simple wind Charger circuit electronic project is designed using the LTC1042 monolithic CMOS window comparator, manufactured by Linear Technology. This Wind charger circuit electronic project use the wind power to produce the energy required to charge Ni-Cd or Lead Acid batteries. If generator voltage output is below 13. 8V, the control circ
MAX712 charger circuit for gel cells NiMH NiCd batteries
For the MAX712 charger is needed a power supply with a output voltage with at least 1. 5V higher than the maximum battery voltage. Charge completion is determinate by a voltage-slope detecting analog-to-digital converter, timer, and temperature window comparator.
MAX8844 lithium ion charger electronic circuit design
Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery. The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Sch
MAX8903A charger circuit diagram
The DC input for this charger ic operates from 4. 15V to 16V with up to 20V protection, while the USB input has a range of 4. 1V to 6. 3V with up to 8V protection.
NiMH battery charger circuit diagram using LTC4060
Using the LTC4060 integrated circuit, can be designed a very simple smart NiMH battery charger electronic project. This electronic charger circuit project is a complete fast charging system for NiMH or NiCd batteries. This NiMH battery charger circuit require few external components and it has a very high efficiency. Backup termination consists
Portable solar charger designed using LM358N
As you can see in circuit diagram, this portable solar charger circuit, is based on a LM358N operational amplifier and one transistor. This regulator provide a constant 2. 4 volts DC and can be used for powering small devices that needs to be powered from two AA battery cells. Because the regulator has a low drop down voltage of 0. 3 volt you sho
Power management integrated circuit LTC3554
This micropower multifunction power management integrated circuit (PMIC) is designed using LTC3554 manufactured by Linear Technology Corporation and is a solution for portable Li-Ion Polymer battery-based applications. This micropower multifunction power management integrated circuit integrates a USB-compatible linear PowerPath manager, a stand
Solar powered battery charger using LTC4071
A simple Solar powered battery charger, photovoltaic charger circuit can be designed using LTC4071 Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect. When VCC reaches the programmed float voltage (4. 1V with ADJ floating) then the LTC4071 shunts excess current not used by the load, limiting VCC to 4. 1V and effectively reduci
UC3906 battery charger controller circuit
This UC3906 battery charger circuit controller contains all of the necessary circuitry to control the charge and hold cycle for sealed lead-acid batteries. The UC3906 battery charger circuit is specifically designed to provide the proper charging voltage and current determined by the temperature and state of charge of the battery. The UC3906...
Supercapacitor charger electronic circuit using LTC3625
A very simple supercapacitor charger electronic project can be designed using the LTC3625 IC designed by Linear technology to charge two supercapacitors in series to a fixed output voltage (4. 8V/5. 3V or 4V/4. 5V selectable) from a 2. 7V to 5. 5V input supply. Automatic cell balancing prevents overvoltage damage to either supercapacitor while...
12 Volts Lead Acid Battery Charger
12 Volts Lead Acid Battery Charger Circuit Except for use as a normal Batter Charger, this circuit is perfect to â€˜constant-charge a 12-Volt Lea..
L200 12V Constant Voltage Battery Charger Circuit
L200 12V Constant Voltage Battery Charger Circuit This battery charger is based on L200 regulator IC. L200 is a five pin adjustable voltage and..
Ni-MH Ni-Cd Adjustable Constant Current Charger
Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It..
Automotive Battery Charger Project
This automotive battery charger project is designed to charge 12V electrolyte lead acid batteries. ..
Car battery charger Automative car and motorcycle schematics
The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then, connect the battery to be charged to the output terminals. All you have to do now is push S1 (
Lead-Acid Battery Charger Monitor
As per manufacturer s data sheets, a 12V rechargeable lead-acid battery should be operated within 10.1V and 13.8V. When the battery charges higher than 13
Free Energy Circuits
AC-DC & DC-DC Circuits
Solar Cell Circuits
Current Limiting Circuits
Micro Power Circuits
High Voltage Circuits
Switching Power Supply Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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