Is open collector sinking or sourcing?

While the NPN open collector transistor circuit produces a “current-sinking” output, that is the NPN transistors open collector terminal will sink the current to ground (0V), a PNP-type transistor can also be used in an open collector configuration to produce what is called a “current-sourcing” output.

How do you connect open collector output?

With open collector output, you simply cannot just connect the output device to the pin and then to ground. Open collector does not work that way. It must have positive voltage and then the load and the negative or ground side of the load connects to the output.

Why should you not switch the emitter with the collector of a bipolar transistor?

Transistors are designed to provide the optimum performance when they are correctly connected. Interchanging the collector and emitter terminals not only degrades the transistor performance but also might cause permanent damage to the device.

Does it matter which way a transistor goes?

Yes current can flow in both directions. An NPN transistor backwards is also an NPN. There will still be a reverse beta, however, the backwards NPN transistor won’t work as well as a correctly oriented one will. It’s not recommended.

What does the collector do on a transistor?

The collector-base junction is always in reverse bias. Its main function is to remove the majority charges from its junction with the base. The collector section of the transistor is moderately doped, but larger in size so that it can collect most of the charge carrier supplied by the emitter.

In which bias a collector in a transistor is connected in electrical circuit?

Answer: Collector in a transistor is connected in reverse bias in an electrical circuit. Explanation: Only reverse bias collector can collect majority charge carriers from the base region.

How does open-collector output work?

An Open Collector Digital Output behaves similarly to a Solid State Relay, by toggling the state of the output, you can switch a circuit on and off. This type of output does not supply power to the load like an ordinary digital output, it simply switches a powered circuit to ground.

Why emitter and collector are not interchangeable?

No, we cannot interchange emitter and collector of a transistor due to following reasons: (i) In a transistor emitter is heavily doped and collector is comparatively lightly doped. (ii) In a transistor, the contract area of emitter- collector junction is larger than that of emitter- base junction.

What will happen if we interchange emitter and collector?

What happens if you put a transistor in backwards?

What happens when a transistor does not receive enough current?

When the transistor does not receive sufficient current at its base, no current can flow from emitter to collector to power the load, which in this case is a motor. Even though the collector of the transistor needs positive voltage (for an NPN transistor) in order to operate, it will not turn on just because voltage is attached to it.

How do you connect a transistor to a circuit?

Looking at the back side of the transistor, the emitter is the first pin, the base is the middle, and the collector is the third. To connect the transistor as a switch in a circuit, we connect the output of the device that will switch on the transistor to the base of the transistor.

What is emitter follower circuit in common collector circuit?

In common collector circuit, as we know input terminal is base and output terminal is an emitter. In this connection output value always follows the input supply voltage. Emitter value is always nearly equal to base input supply value. Hence here emitter follows base voltage so it called emitter follower circuit also.

How does a motion detector transistor work?

Only when the transistor turns on and current can flow down to ground is there an established electric potential. This is now when current can flow. Current can only flow when there is an electrical gradient of voltage. When the motion detector detects motion, it outputs a current from its output pin to the base of the transistor.