Now let's have a look at poewr ratings of 2N3904: Let's have a look at the equivalents of 2N3904 NPN Transistor:Īlthough common transistors such as 2N3904 are easily available in local/online electronics stores, but its wise to know the alternatives. Here's the link to download 2n3904 Datasheet: In order to get in-depth knowledge on any component, must read its datasheet.Let's have a look at the Datasheet of 2N3904: 2N3904 Pinouts alongwith their symbols are shown in the table given below.2N3904 Pin Diagram is shown in below figure:.used in televisions, home appliances, medium-load switches, PWM applications etc. It has a wide range of applications i.e.Small voltage at base(around 0.7V) changes its state from reverse to forward biased and starts conducting.As it's an NPN transistor, so major charge carriers are electrons caryying negative charge.2N3904 is a silicon NPN Bipolar Junction Transistor (BJT), enclosed in TO-92 package and is normally used for switching & amplification purposes.It is a steady, and harmonic-free FM transmitter so it is used in a place where we need stable FM broadcast.Keep all the parts as close as could reasonably be expected and utilize a 12-inch wire for the antenna or utilize a 30-inch wire antenna for a more prominent range. The input voltage can be 9- or 12-volts DC.

The loop L is equivalent to 8 to 10 turns of #22 enameled wire twisted on 6.30 millimeters breadth structure.

The circuit is just utilizing a couple of parts however gives a decent range. The rf circuit that appeared beneath is a smaller than usual stable FM transmitter that is utilizing a Zener diode to give precise voltage to the oscillator while the battery drains, because of which it won’t float its frequency. There are numerous procedures to produce an FM transmitter stable so it won’t change its frequency as the battery drains. In this part, we are discussing the operation of the “FM transmitter circuit” which is stable and harmonic-free.

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