This experiment is used to test 1.5 volt batteries. Like the last experiment, this is a variation of the differential pair transistor configuration. In addition, this experiment uses diodes to reference voltage in the circuit. The experiment functions very simply. If the right LED is bright and the left LED is off, the battery being tested is good. If the left LED remains lighted, the battery is weak. This circuit uses two diodes (the left transistor is being used as a diode) to create a combined voltage reference of 1.1 volts. This voltage is constant at the base of the middle transistor that lights the left LED. If the battery being tested voltage is greater then 1.1 volts, the right transistor will light the right LED, and the battery's voltage will turn off the left LED.
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