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Results tagged with transistors
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user 4436
A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).
4
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Calculating Voltage Drop over a transistor
Also bare in mind, however, that no two transistors are identical.
The datasheet will have graphs which you can use to look up the expected values. … But be aware that these can vary enormously firstly between transistors of one model, as well as under different operating conditions for that model. …
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5
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Darlington pair base resistor value calculating
To get the gain of a darlington pair, multiply that figure for the two transistors together. Often transistors' specifications include two values for hfe: The typical and the minimum. … Similarly, a lower value could be used if you find it is not turning the transistors entirely off. …
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4
answers
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Moore's Law Timeline
I find it incredible how transistors per area keeps increasing. How has it been achieved so far? … Or material science improvements which allowed higher quality materials in the transistors, tracks, and layering? Any other facets?
Thanks …
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19
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3
answers
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Transistors in parallel
I want to use several transistors in parallel to control current through a load. … This is to distribute the current through the load across the transistors so that individual transistors with a rated collector current less than that going through the load can be combined to control …
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3
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Accepted
Questions about a simple LED circuit using the ULN2003A
To answer your questions:
Correct: it is ok to tie directly to tbe base pin, given the internal resistor. The reason one size fits all, is the combined gain of the darlington pair is so high, and th …
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Sanity check my first project: to control my air conditioner with a Nest
If switching relays with NPNs, you'll want a diode to protect against coil reverse-induced emf when it de-energises, as per the diagram below. 2N2904 should be fine. Also, I would definitely use a res …
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