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Battery Chargers Alarms Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, July 18, 2008 11:34 AM

Master Category List - Dave's Circuits
 
  • Two 12v Battery Isolator 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 either side of the FET. As long as the voltage on the drain side is greater than the source side, the FET is turned on....
  • Solar Powered Lithium Ion Battery Charger uses a LTC1734     NEW
    The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6 volt solar panel....
  • 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.


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