When Positive pulse is applied, Q2 will turn ON and Q1 will turn OFF. Initially Q2 will be in the OFF state and the capacitor gets charged up to Vcc. Circuit diagram for Mono-stable latchīy applying negative edge to the output transistor, it changes its state from Low to High and remains in the high state up to a time constant duration T and gets back to low state i.e. the output terminal that is taken as reference remains either in the High or Low state for a pre-set time duration. Below video explains the operation of the circuit.Ī Monostable circuit has only one stable state, i.e. Between two switching actions, the transistors remain in one of their stable states. The state of the transistors is changed by changing the switch position. the output terminal that is taken as reference remains either in the High or Low state depending on the switch position. The below video shows how to analyze a transistor circuit.īi-stable latching circuit using transistorsĪ bi-stable circuit has two stable states, i.e. The typical operating conditions for different modes of a particular transistor are obtained from its datasheet.Īs mentioned before, Proteus software can be used to analyze the circuits. When sufficient V be is applied, the transistor turns ON and is in the saturated state. If the base signal is not applied, the transistor remains in OFF state known as the Cut-Off state. The below video shows, how to lay the circuit in the workspace and basic operation of the circuit.Ī transistor in switching applications has a Cut-Off mode and saturated mode operation. Circuit diagram for Transistor as a switch This example explains, how to use a transistor as a switch in Proteus software, to operate a relay using the transistor BC 547. The control signal may be obtained by manual input or may be generated by another block in the circuit.

One of the most common use is to drive a relay to switch ON/OFF a load. The basic application of a transistor is operating it as a switch. Various Types of Transistors in Proteus Transistor as a Switch

Even though SCR, TRIAC do not fall directly under transistor category, they are also similar to transistors in AC circuits. Mostly BJTs are used for low power and amplifier applications, while MOSFET, IGBT are used for High switching frequency and High power rating loads for example inverters, Home UPS etc. Different types of transistors like BJT, FET, MOSFET and some power electronic semiconductor switches like SCR, TRIAC, IGBT etc.

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