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Results tagged with transistors
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user 187471
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
votes
High Vce(sat) of 2SD1048
Question
NPN BJT = 2SD1048
LCD Screen = 100mA
Expect Vce(Sat) = 80mV
But now Vce = 3.3 - 2.6 = 700mV
Why?
Answer
I think the LCD should be on the high side, as shown below. You might like to refer t …
- 2,956
9
votes
Understanding the curves of a MOSFET
for the description of linear and saturation regions)
Appendices
Appendix A - Recommended reading list of the Jaeger book
Part 1 Solid State Electronics and Devices
Chapters
Chapter 4 Field-Effect Transistors … page 145,
Chapter 5 Bipolr Junction Transistors page 217
Sections
Saturation of the I-V characteristics, Section 4.2.4, Page 154, Fig 4.8
Mathematical Model in the Saturation (Pinch-off) Region, …
- 2,956
2
votes
How does this modified H-bridge circuit work?
Answer
(1) Q5 is to switch on/off Q1 or Q3,
(2) R1 and R3 are to bias Q3,
(3) R5, C2, D1 are to by pass noise (Note 1) and clamp input,
(4) C1 is also used to by pass noise.
Notes
(1) A H-bridge wit …
- 2,956
-1
votes
Current mirror: real-life examples?
Question
Are there are real life examples of using a current mirror?
Answer
I am using the following current sensing amplifier chip, which is using a current mirror.
My real life project still in p …
- 2,956
6
votes
Accepted
What is the difference between 2N7000 and 2N7002 MOSFETs?
Question
What is the difference between 2N7000 and 2N7002?
Answer
One critical difference for me is that 2N7002 is definitely logic level trigger, 2N7000 is not so sure.
References
(1) 2N7000 / 2N7 …
- 2,956
7
votes
How can I use a 2N2222 transistor as a temperature sensor?
References
(1） P2N2222A Amplifier Transistors NPN Silicon - On Semiconductor
Update 2020oct06
The old reference list was getting too long and messy, so I have moved those not too relevant old references … (17） Precision Temperature Measurement Using CMOS Substrate PNP Transistors - M Pertijs, G Meijer, J Huijsing etal, IEEE Sensor Journal 2004.
(18) Diode-Based Temperature Measurement - TI, Application …
- 2,956
3
votes
Can I use a ULN2003A IC as many transistor switches?
Question
Can I use ULN2003 to switch 5V relays which in turn switch 220VAC loads?
Answer
No problem at all.
Your ULN2003 choice is good, because it can handle max 150mA, and the most popular, typical …
- 2,956