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My question is which is better for transmitting an audio signal on the common 88 - 108 fm band: the common 2n3904 NPN transistor or the PN2222A NPN or are they interchangeable. I have seen a lot of circuits and some have one and some have the other.

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I realized my question was not clear. For the time being I would be fine if you could tell me which of these transistors would be best for this circuit. I know the 2N3904 is used but would the other one be better or could they be interchanged?

Image from http://i1.wp.com/cdn.makezine.com/uploads/2013/10/kogawa_simplest_transmitter.png

from 1.wp.com/cdn.makezine.com/uploads/2013/10/kogawa_simplest_transmitter.png

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  • \$\begingroup\$ They're reasonably interchangeable but both are rather underpowered for this application. There's nothing in this question that can't be answered by consulting the datasheets. \$\endgroup\$
    – user207421
    Commented Apr 3, 2015 at 0:56

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This can't be answered because you haven't provided a schematic and said what function exactly the transistor in question is supposed to perform. Either of those transistors could be appropriate for some functions in a FM transmitter.

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