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
This setup is called a Darlington Pair or 'D.C. Amplifier'. If the circuit is built without resistor and fingertip bridges the gap the lamp will light. It will also trigger if water bridges the gap; it can be used to monitor any place that should stay dry. The lamp could be replaced by a sonalert for an audible alarm.
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