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It acts exclusively as an electrically controlled switch. The UJT is not used as a linear amplifier. It is used in free-running oscillators, synchronized or triggered oscillators, and pulse generation circuits at low to moderate frequencies (hundreds of kilohertz). It is widely used in the triggering circuits for silicon controlled rectifiers.
If no current/voltage is applied to the gate lead, the TRIAC switches off. On the other hand, if the trigger voltage is applied to the gate lead, the TRIAC switches on. TRIACs are suitable for light-dimming circuits, phase-control circuits, AC power-switching circuits, AC motor control circuits, etc.
The most widely used electronic switch in digital circuits is the metal–oxide–semiconductor field-effect transistor (MOSFET). [2] The analogue switch uses two MOSFET transistors in a transmission gate arrangement as a switch that works much like a relay, with some advantages and several limitations compared to an electromechanical relay.
The logic was also called a current-mode circuit. [12] It was also used to make the IBM Advanced Solid Logic Technology (ASLT) circuits in the IBM 360/91. [13] [14] [15] Yourke's current switch was a differential amplifier whose input logic levels were different from the output logic levels.
Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signaling of digital data. The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented.
It can also be used as an electrically controlled switch, where the amount of current is determined by other circuit elements. [93] There are two types of transistors, with slight differences in how they are used: A bipolar junction transistor (BJT) has terminals labeled base, collector and emitter. A small current at the base terminal, flowing ...
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The term is often used, for example, for a specialized integrated circuit that controls high-power switches in switched-mode power converters. An amplifier can also be considered a driver for loudspeakers , or a voltage regulator that keeps an attached component operating within a broad range of input voltages .