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COTM_AugustTransistorTransistors work as amplifiers, delivering larger amounts of juice when triggered by a relatively small amount of voltage. One advantage of this is that you can use it to detect slightly conductive substances (e.g., tap water) and trigger an effect thereby.

Garrett used a TIP-120 Darlington transistor, a capacitor, a resistor, and a heat sink to create a sensor that can detect when its electrodes have been immersed in a conductive liquid.

When the electrodes contact the liquid liquid, current flows from the power supply to the Darlington’s base pin, triggering current flow from the collector to the emitter.

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net


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