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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Battery Chargers Circuits
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Lithium Ion

2-12v Battery Isolator Circuit with a LTC4412  -  Linear Technology 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]


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]

Battery Amp-hour Capacity Tester  -  I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights.  What I like about these new batteries is that they are the same size as a standard 1.5v alkaline AA cell . . . [Circuit by Dave Johnson P.E.,  02/05/12]


Battery Charge Current Indicator  -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . [Circuit by Dave Johnson P.E.,  07/23/06]


Candle Power  -  A single lit candle in conjunction with an inexpensive thermopile voltage generator provides enough power to charge a small battery when used with a small low voltage DC to DC converter . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/01/12]


Cell Phone Charger  -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter.  If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by Dave Johnson P.E.,  08/24/09]


Cell Phone Solar Powered Charger  -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas Instruments . . . [Hobby Circuit designed by David Johnson P.E.,  01/02/11]


Circuit Indicates Battery Charge Current  -  This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/23/11]


Circuit indicates Battery Charging Current  -  Anyone who has ever had a shocking experience on an especially dry day is acutely aware of the kinds of high voltage that can be generated from a simple walk across a carpeted floor. Those same finger to metal sparks can destroy or disrupt sensitive elect . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/23/11]


Current Indicator for Battery Chargers  -  This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . [Circuit by Dave Johnson P.E.,  01/23/11]


DIY Cell Phone Charger  -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter.  If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Hobby Circuit designed by David A. Johnson P.E.,  08/24/09]


Do It Yourself Portable Cell Phone Charger  -  It seems that as cell phones become more sophisticated, their operating times become shorter and shorter.  If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . [Circuit by David Johnson P.E.,  08/24/09]


Eight-Solar Cell Lithium Ion Battery Charger Version 3  -  A single lithium ion battery cell needs 4.2v from a current source to insure it is fully charged.  A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area.  If you divide 4.2 by eight you come up with a figure of 0.525 volts . . . [Circuit by David A. Johnson P.E.,  05/21/13]


Dave's Battery Chargers Circuits
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