Transistor as a Switch If the circuit uses theBJT transistor as a switch, then the biasing of the transistor, either NPN or PNP is arranged to operate the transistor at both sides of the I-V characteristics curves shown below. A transistor can be operated in three modes, active region, sa...
Note that even if you use a high enough voltage to have 1A current flowing, it doesn’t mean you’ll get 1A. It just means that youcouldhave 1A flowing if you wanted to. But it’s whatever you connect to it that decides the actual current. So you can go as high as you want, a...
Bipolar transistorsare generally a three lead active electronic component which fundamentally work as a switch for either switching ON or switching OFF power to an external load or an associated electronic stage of the circuit. A classic example can be seen below, where a transistor is connected a...
I'm looking to increase the output current drive of a high voltage op amp using a push pull amplifier. The OPA454 datasheet includes an application circuit to do exactly this, and includes some current limiting resistors: As noted, R3=20ΩR3=20Ω provides current li...
Okay, now that you know the difference between a transistor amplifier and a switch, let’s use the transistor as a switch in order to flash an LED on and off. CHECK THE DATASHEET The first step is to Google the datasheets for both the LED and the transistor. You’ll notice on the ...
In an earlier question I asked about driving a speaker with a BJT transistor. @Jonk offered a push-pull amplifier design of his own, and @G36 noted its similarity to the JLH amplifier described in a paper from 1969. In 1969 NPN power transistors were easier to come...
Transistors are at the very core of today's electronics technology. The development of the bipolar transistor or bipolar junction transistor, BJT, has resulted in many changes to the world.The introduction of the bipolar transistor has enabled many technologies we take for grante...
How to Design and Build a MPPT Solar Charger Using Arduino: Introduction I had a busy retirement life before COVID19 lockdown. To battle the lockdown boredom, I built an off grid solar energy system with a few 100W solar panels, a PWM charge controller,
In this circuit, the transistor acts as a switch and an amplifier. The same setup to set the transistor as a switch is also to set it up as an amplifier. If using a PNP transistor, negative voltage is supplied to the collector.
Transistors are crucial components of modern electronics. When working as an amplifier, a transistor transforms a small inputcurrentinto a bigger output current. As a switch, it can be in one of two distinct states -- on or off -- to control the flow of electronic signals through an electri...