Study guides, Class notes & Summaries

The base of a BJT is connected to the input signal, the emitter to ground, and the collector to the light source in order to use it as a switch in a light control circuit. The light source is turned on when the input signal is high, which activates the transistor and causes current to flow through it. Low input signal levels cause the transistor to turn off, cutting off current to the light source and turning it off.

The flow of current in a circuit can be managed using a switch such as a bipolar junction transistor (BJT). When employed in this manner, the BJT can control the flow of current to a load since it is either totally "on" (saturated) or fully "off" (cut-off). A BJT switch can be used in light control circuits to turn on or off a light source in response to an input signal. In this instance, the signal from a sensor or other input device operates the BJT as a switch.

An electronic bridge rectifier is a circuit that changes an input signal from alternating current (AC) to a direct current (DC) output signal. Its construction, which consists of four diodes placed in a certain way, enables it to correct both the positive and negative cycles of the AC signal. A bridge rectifier is primarily used in power supply circuits to transform the AC voltage from the power source into a DC voltage that may be utilized to power electronic devices. For many electronic cir...

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