# How to calculate a transistor? ### How to calculate a transistor?

1. Calculation basic resistance.
2. Ic = 0.176 A.
3. ib > 0.1 = 0.88mA.
4. Knowing ib, it is now possible to calculate Rb with Rb = Urb / ib and Vbe + Urb = VoH.
5. Urb = 2.8V.
6. We can calculate Theoretical Rb: Rb = Urb / ib = 2.8 / 0.88.10-.
7. We will choose Rb = 1.2 K.

### How to calculate VCE transistor?

This current is calculated depending on the resistance of the load and the voltage across it.

1. Note that the voltage vce Sat.
2. is close to 0V but not.
3. nothing. vce sat ≈ 0.2V.
4. Ic = 0.176 A.
5. We take a safety factor of k= 2 to be sure that the transistor is well saturated:
6. Ib_sat = Ib_min x 2 = 1.76mA.

### How does the bipolar transistor work?

One bipolar transistor works like a current/voltage amplifier: it amplifies the current sent to its base. There are different types of transistorsthe two main classes being the bipolar transistors and field effect.

### How to measure the resistance of a transistor?

For the test with a simple multimeter, one can compare a transistor ordinary two diodes connected together. Simply position one of the multimeter leads on the base of the transistorand then from measure with the other two electrodes (emitter and collector).

### What is the condition for vbe and VCE for the transistor to work?

For that a current Ic flows in the transistorit must be supplied with a current of basis equals (to a working in the linear zone) or higher (to a working in the zone of saturation) at Ic/β. When the transistor is conductor, the base-emitter voltage Vbe is between 0.6 and 1 V.

### How to calculate the VCC?

Formula. R = (Vcc – Vf) / If with R in Ohms, Vcc and Vf in Volts, and If in Amps. Example. To use a red LED under a voltage of 12 V, R = (12 – 1.6) / 0.0 Ω.

### What is the principle of operation of the transistor?

One transistor NPN is driven (or driven) by a positive base-biased current to control the flow of current from the collector to the emitter. The transistors PNP-type are driven by a base-biased negative current to control the flow from the emitter to the collector.

### How do you know if a transistor is dead?

To check if the transistor works, you can check if this diode did not burn out. To do this, simply use the multimeter in “diode” mode. If the diode blown, is is completely passable in both directions: the displayed voltage is zero or too low.