Posted on Sep 10, 2012

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 Sl. The circuit has proven reliable in testing NiCad-, carbon-, and alkaline-type batteries. Closing Sl activates the circuit by applying voltage from the battery under test.

Click here to download the full size of the above Circuit.

Voltage V, 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 V, rises to the level of V,, when the LED turns off.

Leave Comment

characters left:

New Circuits



Popular Circuits

Discrete component motor direction controller
EM Field Probe with Meter
Cold-Cathode Fluorescent-Lamp Supply
Vehicle Tracking System using GPS and GSM modem
Soft Start For Torch - Increases The Life Of Torch Bulbs
Low Ohms Adaptor For DMMs Based On An LM317 Regulator
Infrared remote control receiver for Media Centers
Flicker frequency of multiple sets of different light-emitting diode lights chain circuit