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6v NMH/NiCd Battery Tester - I designed this circuit to test rechargeable six volt
battery packs under constant current conditions. As designed, the circuit applies a 10
amp load to the battery pack. A heat sink must be used on the main power transistor.
….(designed by David A. Johnson) |
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Battery Characterizer - (electronic circuit added 4/05) |
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Battery Simulator Provides Current Limiting - 08/01/97 EDN-Design Ideas: A
constant-voltage active load can perform as a battery during charge cycle. You can set
load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries
ranging from 6 to 32V.....(design idea added 5/03) |
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Button Battery Cell Internal Resistance Measurement Circuit - The open cell voltage of
a small silver oxide button cell battery remains very close to 1.5 volts over most of the
life of the cell. However, there is a relationship between battery health and the
internal resistance of the cell. This circuit when used in conjunction with an
oscilloscope will measure the internal resistance. You will have to use a known good cell
as a reference. ….(designed by David A. Johnson) |
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Constant Voltage Load Tests Battery Chargers - 04/11/96 EDN-Design Ideas: (design idea
added 6/06) |
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Discharger - The reason I designed this discharger are many, however I will list a
typical example. A modeler charges his batteies for 14 hrs, then goes to the field for a
fly. He then rests for a week, then charges his batteries again for 14 hrs and flies
again. The third time, he repeats the procedure, then wonders why his aircraft has a major
argument with the runway. The problem with this method is that he is rechargeing a battey
pack which after the first week, is in an unknown state of charge...(added 6/07) |
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Discharger for Receiver Battery Packs - ….(circuit design added 08/08) |
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LED Battery Condition Indicator - (electronic circuit added 4/05) |
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Phantom Power Battery Test Circuit - LED will light when battery is over42 volts
(added 3/03) |
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Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells. Two-LED display, no
power supply required. (electronic circuit added 06/07/08) |
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Simple but reliable car battery Tester - ….(circuit design added 03/08) |
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Simple Car Battery Charger psimages - This very simple circuit uses a transformer ,two
diodes , a capacitor and an ammeter. To charge a battery just connect + and terminals
of circuit to corresponding terminals of battery. When battery is not charged,
ammeter reading shows 1-3 amps.....(added 10/05) |
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Simple car battery Tester - This circuit uses the popular and easy to find LM3914 IC.
This IC is very simple to drive, needs no voltage regulators (it has a built in voltage
regulator) and can be powered from almost every source…(electronic circuit added 05/08) |
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Small Battery Capacity Tester - The only truly accurate way to measure the current
capacity of a battery is by connecting the battery to a constant current load and measure
how long the battery can sustain that current before its voltage drops below a recommended
“cutoff” point. The circuit below is designed to do this type of test..... ….(designed by
David A. Johnson) |
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Solid state relays simplify monitoring electric car Battery Voltage - 02/19/04 EDN-Design
Ideas: Figure 1 shows the propulsion system of an electric vehicle. It includes an
electric motor, drive electronics, a mechanical transmission, vehicle control/power
management, a charging system, and a battery. The long-term performance of the electric
vehicle depends on ensuring the electrical health of the battery and its charging
system.....(design idea added 1/05) |
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Test Batteries Without a Voltmeter - 03/15/01 EDN-Design Ideas:.....(design idea added
11/05) |
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Testing Sanyo's Eneloop Low Self-Discharge Rechargeable Battery - ….(electronic
project added 03/09) |
