What is General Purpose transistor?
The 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. It was originally made in the TO-18 metal can as shown in the picture.
How do transistors amplify signals?
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. This forward bias is maintained regardless of the polarity of the signal.
Which is the best transistor to keep in your parts kit?
The 4 best transistors to keep in your parts kit. #1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits. This configuration means whatever you want to control is #2 PNP – 2N3906. #3 Power – TIP120.
Which is the best high side transistor for NPN?
A high-side circuit is where the load sits between the transistor’s collector and the circuit’s ground. Its emitter connects to the “high voltage.” Since I recommended a 2N3904 for the NPN, I will suggest its complement: the 2n3906. Like the NPN, it has the same max voltage and current ratings: 40V and 200mA.
What kind of transistor do you use for a BJT?
For most circuits either a BJT or MOSFET can be used, depending on the load current you need to switch. [Edit Note] Jan (comment below) points out that there are European Equivalents that may be more available for those located in that part of the world.
What kind of transistors are used in low side switch circuits?
There are two variants, the NPN and PNP. These little guys are the workhorses of most control circuits, for small current applications. You’ll commonly find through-hole parts in the 3-pin TO-92 style package. You can find most often NPN Transistors in low-side switch circuits.