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Battery Charger Circuits
Battery Charges      Alkaline       Lead Acid       

Last Updated on: Thursday, April 07, 2016 01:00 PM

Circuits Designed by Dave Johnson, P.E. :

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:


1.3V Power Supply -  This is a replacement power source for 1. 3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer. . .  [Andy Collinson's design]


12 Volt Gel Cell Charger -  Recently, a fellow amateur was looking for a gel cell charger which would first charge at a fixed rate and then later switch to a trickle charge when the cell was fully charged. After reviewing several catalogs and web sites, the MAX712 IC was discovered. This IC meets all the requirements for almost any type of battery charging system. The circuit in Figure 1 was designed specifically for 12 volt gel cells. . .  [Radio Amateur Society of Norwich]


12V input 12V battery charger  -  Well suited for charging gelled batteries from a car, with the engine running or stopped. . . .  [Manfred Mornhinweg]


12V, 4-AA Cell Differential Temperature Charger -  This project makes a number of improvements over my Temperature Controlled NICD Charger circuit. The new circuit runs on 12VDC, allowing it to be used in a car or from a 12V solar power system. Additionally, a current sensor LED verifies that the cells are receiving charging current. Note that the current sensor circuitry. . .  [G. Forrest Cook]


2-12v Battery Isolator Circuit with a LTC4412 -   has just announced a neat little chip (LTC4412) . It has been designed to be used in conjunction with an external P-channel power FET, to form an ideal diode function with a very low 0. 05v voltage drop. The chip monitors the voltage on eit . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/07/08]


3.3V lithium-cell supply requires one inductor -  08/05/99 EDN Design Idea   Because ofgrowing popularity of lithium-ion (Li-ion]batteries and 3. 3V power supplies, portable-equipment designers must often create a 3. 3V supply that a single Li-ion cell can power. . .  [by Matt Schindler and Jay Scolio, Maxim Integrated Products, Sunnyvale, CA]


5v Solar Charger -  This project uses the 1. 2v rechargeable battery and solar panel from a Solar Garden Light. These lights can be bought for less than $5. 00 in most $2. 00 shops or similar shops that sell general household items. . . .  [email Colin Mitchell: talking AT tpg.com.au]


8-Solar Cell Lithium Ion Battery Charger Version 2 -  Jim Wilber looked at my design for a battery charger and sent me some suggested changes. He suggested using the LTC4412 ideal diode IC to switch off the current path from the solar cell to the battery in darkness. He also noted that the 2. 5v regulator from Seiko I had selected was no longer in production and suggested using the shunt reference . . . [Circuit by David A. Johnson P.E.,  05/21/13]


A Solar Cell Battery Charger -  A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell. . . .  [G.L. Chemelec, designer]


A Solar or Wind Charger/Dump Circuit -  Solid State design, No Relays. This is just a Preliminary design. . . .  [G.L. Chemelec, designer]


Amplified Zener -  A 13 volt Zener diode will work well for charging a 12 volt battery on Standby use. Or use a 14 volt zener a diode for a Standard 14. 6 volt charge. . . .  [G.L. Chemelec]


Another Battery Charger for small battery's or battery Packs -  This Trickle Charger is Both Current and Voltage Regulated for Sealed Lead Acid or NiMh types. It uses a Wall Adapter as the main Power Source and Can charge a 6 or 12 Volt ones. . . .  [G.L. Chemelec, designer]


Atmel Solar Panel Battery Charger -  Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V. It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs. I built this circuit into the plug of a VW solar charger panel that is used to prevent a discharge of the battery when a car is not used for some time. A modern car contains a large amount of electronics, and a quiescent current of 40-50mA (about 1Ah per day!) is considered "normal". . . . 


Auto Batteries Charger -  Schematic only, no circuit description]. . .  [by IQ Technologies Industry, unless otherwise noted online]


Automatic 12V Lead-Acid Battery Charger -  schematic only, no circuit description at this time. . .  [Designed by Andrew R. Morris]


Automatic Trickle Charger -  Scroll down to find this circuit. Here is the schematic for the automatic charger I have been using for my kids' battery cars. The charger is a small molded unit that probably doesn't supply more than an Amp and this circuit would have trouble with much more. No current limit is provided by this circuit. . .  [Charles Wenzel (unless otherwise noted)]


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Battery Charger Circuits
Battery Charges      Alkaline       Lead Acid       

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