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switches - MOSFETs or BJTs for using as switch for audio ...
https://electronics.stackexchange.com/questions/66332/mosfets-or-bjts-for-using-as-switch-for-audio-signals
I was wondering which component is better for using as voltage controlled switch for audio signals (e.g. music signal from mp3 player). Should I use MOSFETs or …
How to use a Bipolar Junction Transistor (BJT) as a …
https://www.circuitbread.com/tutorials/how-to-use-a-bipolar-junction-transistor-bjt-as-a-switch
So for a BJT to act as an open switch, all you need to do is to make sure that its base-emitter junction is not forward-biased. Now, for a BJT to act as a closed switch, it needs to operate in the saturation region. In figure 8, we’ve assumed that the npn BJT is operating in the saturation region.
BJT as Switch - The Engineering Knowledge
https://www.theengineeringknowledge.com/bjt-as-switch/
BJT as Switch. In the below figure the circuit shown explains the operation of BJT as a switch. In the first circuit, the transistor is in the cutoff region because the emitter-base junction is not forward biased condition. In this state, there is no connection between emitter and collector of a transistor as shown like an open switch.
Activity: BJT device as a switch [Analog Devices Wiki]
https://wiki.analog.com/university/courses/eps/bjt-switch
A switch consists of a BJT transistor that is alternately driven between the saturation and cutoff regions. A simple version of the switch is shown in figure 1. When the input equals -V in, the base-emitter junction is reverse biased or off so no current flows in the collector. This is illustrated by the load line shown in the figure.
BJT Switch and Microcontroller - Codrey Electronics
https://www.codrey.com/analog-electronics/bjt-switch-and-microcontroller/
In principle, BJT is a current amplifier hence Ic = Ib x hFE. Assume that the 70mA relay may require 100mA to operate, hence Ic=100mA. Since the general-purpose BC547 transistor has a minimum gain just above 100, base current required to saturate the transistor will be IB = Ic/hFE = 100mA/100 = 1mA. Here, formula for base resistance RB = (I/P ...
Transistors: Bipolar Junction Transistors (BJT)
https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-071j-introduction-to-electronics-signals-and-measurement-spring-2006/lecture-notes/19_bjt_1.pdf
Basic BJT Applications Switch Consider the circuit shown on Figure 8. If the voltage is less than the voltage required to forward bias the base-emitter junction then the current vi IB =0 and thus the transistor is in the cutoff region and IC =0.
BJT as an Amplifier - The Engineering Knowledge
https://www.theengineeringknowledge.com/bjt-as-an-amplifier/
In today’s tutorial, we will have a look at BJT as an Amplifier. A transistor is an electronic component that has three terminals. Terminals are base-emitter, collector and base. It used in different electronic projects and circuits for switching and amplification process. Amplification is process through which weak input signal is amplified ...
BJT audio amplifier - CircuitLab
https://www.circuitlab.com/circuit/6syafk/bjt-audio-amplifier/
Bode. Run the frequency-domain analysis to see a plot of the gain of the amplifier. As-is, it's about +38dB in the passband. That's a voltage gain of 10^ (38/20) = 79. Notice that our hand calculations indicated a gain of about 88, so that's pretty close! Now remove CE, and re-run the Bode analysis.
Transistor as a Switch - Using Transistor Switching
https://www.electronics-tutorials.ws/transistor/tran_4.html
Transistor switches can be used to switch and control lamps, relays or even motors. When using the bipolar transistor as a switch they must be either “fully-OFF” or “fully-ON”. Transistors that are fully “ON” are said to be in their Saturation region. Transistors that are fully “OFF” are said to be in their Cut-off region.
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