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BATTERY_CAPACITY_TESTER

2016-05-11 15:20  
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BATTERY_CAPACITY_TESTER
BATTERY_CAPACITY_TESTER
The test circuit gives an indication of the capacity remaining in a battery. By noting the time in seconds that the LED remains on after you depress the test switch S1. The circuit has proven reliable in testing NiCad-, carbon-, and alkaline-type batteries. Closing S1 activates the circuit by applying voltage from the battery under test. Voltage V1 jumps to a value V0= VRR3/(R2 + R3) when the switch closes and then increases with a time constant T = C1 (R2 + R3). The divider R4/R5 fixes V2. The reference circuit IC1 sets VR to approximately 2.5 V. The op amp's output remains high (LED on) until V1 rises to the level of V2, when the LED turns off. Calculate the on-time tON as follows: