Resistance Loop current Making Polarity switcher with the DPDT switch: TEST_LED_LOI-OHM_V01 Four Wheel Two Motors Circuit analysis using kirchhoff current law CIRCUITO CASSAFORTE 1 Oscilloscope channels test

In this circuit the transistor act as a logic switch which is controlled by Switch Supply.

The Switch is set on (i.e. logic value of 1) when there is a positive base current. It gets off (i.e. logic value of 0) when there is a zero or a negative base current. 

Try fliping the polarities of the Switch Supply (Battery) and transistor will work as unplugged switch. 

You may want to see that how to use the transistors in this lab.

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