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Step 2The Circuit
As you can see in the wiring diagram the whole thing is really simple but very effektive.
You need two transistors like the BC546 or the BC547, two resistors (4.7kOhm and around 39Ohm), a power-plug and some kind of a socket.
If you wire together all the parts like the diagram says, it should give you a current of around 20mA.
With the value of the second resistor (39Ohm) you mainly control the current. I used a 27Ohm resistor, because it was all I had, and it gives me a current of around 25mA.
You need two transistors like the BC546 or the BC547, two resistors (4.7kOhm and around 39Ohm), a power-plug and some kind of a socket.
If you wire together all the parts like the diagram says, it should give you a current of around 20mA.
With the value of the second resistor (39Ohm) you mainly control the current. I used a 27Ohm resistor, because it was all I had, and it gives me a current of around 25mA.
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