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catchinit | 18:12 Mon 18th Sep 2006 | Science
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How do you work out the required value of resistors needed in a circuit containing a transistor?

For example, a basic moisture tester, 5V dc, contains an LED and a transistor and 2 open wires or prongs, which when touched onto moisture will completethe circuit. So what values do i need to know to start to work out the needed resistors to make the circuit work?
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Avatar Image Siamsal
People write whole books about such things. And you want an answer in a few lines?

In essence, you need to know the voltage there will be across the resistor and how much current you want it to pass.
21:01 Mon 18th Sep 2006
Avatar Image mibn2cweus
transistor biasing 1
06:33 Tue 19th Sep 2006

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