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Why are transistors more complicated than resistors and capacitors?
Transistors are more complicated than resistors and capacitors because you can choose a resistor or capacitor according to required resistance or capacitance value but while choosing a transistor, you have to look for many transistor parameters. So it is a challenging task to choose the right transistor for your circuit.
How to choose the right transistor for an amplifier?
Current is the ratio of the base current to the collector current and a measure of the amplifying ability of the transistor. If you want to use the transistor as an amplifier, then choose a transistor with higher current gain. 3. Collector-Emitter Voltage (VCEO)
How are the number of transistors in a circuit chosen?
There are three main numbering systems, i.e. JIS, Pro Electron, and JEDEC. JIS is used by Japanese Industrial Standard, Pro Electron is a European standard, and JEDEC is an American standard. If you are building a circuit from the internet, then it can be directly chosen using the type number of transistors used in the original circuit.
What’s the difference between a relay and a transistor?
– You can use a transistor to allow one signal to switch a larger load, but it’s not entirely independent. Designers need to know more about the switched device than when using a relay. – You’ll need to properly specify your transistor, whereas relays can tolerate a wide range of power types. – They’re inexpensive.
Why do you add resistor to base of transistor?
Therefore for safety reasons we add a resistor to the base of the transistor. However the base resistor value decides how much triggering current can enter across the base/emitter pins, and therefore in turn affects the collector current.
That small current switches a larger current that can flow through the LEDs. The two currents— small through the two transistors and larger through the LEDs —are illustrated above. Let’s try to estimate the amount of current that flows along each path.