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Electronic Basics #22: Transistor (BJT) as a Switch

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Rating: 4.0; Vote: 1

Electronic Basics #22: Transistor (BJT) as a Switch Wasim: Hello Sir, I am trying to build variable power supply using multiple output of transformer. 0, 5, 12, 15, 19, 24, 28, 36v as input and variable output b/w 1. 2 to 36v. I will use buck step down converter and problem is buck converter heat up when there is big difference b/w input and output, so I created that transformer with multiple output. How can I switch b/w different transformer output lines depend on voltage? like if buck convert output set to greater than 28v => take 36v transformer line as input to buck convert, if buck converter output is greater than 24v take 28v line of transformer. Any arduino or pic programmable chip?
Date: 2020-09-05

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Comments and reviews: 8

hamid
help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me help me
i have big problem with Bjts and that is when i turn on pnp tp127 transistor its have no problem but when in want to turn off it transistor have a big delay that related to load. for example if i use 1k ohm its delay is too much longer when i connected 100 ohm load--i know its related to parasitic capacitance's can any body help me to solve this problem? thank u guys
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Mohammedyasar
I want to control 9V seven segment display through microcontroller and it has common ground configuration, and I have done approximately some tens of experiments with Darlington pairs, PNP, NPN etc, But you know what I mean, Thank you
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dale
I think this video has all of the information I need in it, but it should be about 15 minutes long. Anyway, I will re-view it a couple of times, and am sure I will absorb it.
THANKS FOR ALL YOUR GREAT VIDEOS!
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MuthuRaman
was really good with lot of stuffs, but too fast for me. I need to stop and rewind to understand the concepts. but that was ok, many thanks again. I used low speed option from youtube settings
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jcolonna12
As someone who understands transistors I think you went too fast in this video. I didnt have much time to digest the frames once they were only up for a few seconds at best
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LHJARS
you need a collector-resistans too. In other case you can destroy both transistor and led. The collector-resistans determine what current you want through the diode.
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LHJARS
It's not a good idea to put a led without a resistor in the collector of a bjt. You have no idea what current the led gets. Its a good way to destroy the led.
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Jeevan
how did you calculated the Rb when the PNP transistor is used.
and 5: 22 in the circuit base voltage is 3V but you have kept 6V.
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