Questions tagged [transistors]

The transistor is a semiconductor device that can amplify signals and switch power. Most used types are bipolar (BJT, for Bipolar Junction Transistor), UJT (Unijunction transistor) and MOSFET (FET, for Field Effect Transistor)

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123 views

Can I use MOSFETS instead of transistor in the given circuit

I am modifying an electronic transformer as an irregular power supply as shown in the image below. I am not able to find 13009 high power transistors. Can I use two IRFP460N power MOSFETs in place of ...
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Which cells to use in SG13S library with Cadence Virtuoso?

I am using Cadence Virtuoso with SG13S library and I am confused about which cells I should use from the library for NMOS/PMOS transistors, resistors, capacitors and inductors. There are cells like &...
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77 views

How do you get transistor voltage when you only have currents?

β=50 I need to find Vbe and Vce So obviously it is a NPN transistor, the current is flowing in the same direction so it is in active mode. Ie=Ic+Ib 1.2mA=1mA+Ib Ib=0.2mA Vbe should be around 0.7V for ...
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87 views

How to remove an inductor after getting signal from it?

In the circuit that I've designed, I get 3 different signals and I process them via a microcontroller. 2 of them are from different inductors and 1 of them is from kind of a button. So, my question is ...
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59 views

diagnosing transistor failure in H bridge

I built the H bridge shown in the schematic below for use with an unknown motor I pulled off of a broken CD player. I was seeing how hard I could drive the motor using large values for Vcc, and ...
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55 views

Diagram/PCB functionality explained

I have a diagram that I've recreated from a PCB by studying it's trace routing and what components are in use. Limited to what was listed on the components themselves, I believe I have gotten most of ...
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53 views

NPN Transistor problem

I need to find Vce Would this be correct way of solving it? I got 7.551V for Vce
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Gallium Nitride SCR/Thyristor?

I have an application that requires switching on a load very fast (1ns or so). There are N-channel / low side GaN MOSFETS. I would really like to switch a load on the high side, which causes problems ...
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80 views

Nvidia 1080 ti VRM? SMD Identification

I was hoping that some of you experts could help me identify a SMD on the back of a 1080 ti FE. This item was dropped and it appears has some damage done to it. I would like to replace the missing SMD ...
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59 views

Resistor across output?

I'm trying to learn about gates.Why is a resistor connected parallel across the output?
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29 views

What is the difference between “Operating Voltage” and “Drain-Source Voltage” for an LDMOS FET?

The NXP AFT05MP075NR1 ~75W power N-Channel Enhancement-Mode Lateral MOSFET provides the following maximum ratings in the datasheet: Operating Voltage (Vdd): 17, +0 Vdc Drain-Source Voltage (Vdss): -0....
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Washer Machine Fix

Final Update: See the final 2 images. Currently running a load of laundry. Transistor: NPN - 2222A Relay: Universal Dorman Automotive Relay Battery: 9V Duracel The double capacitor volt reduction ...
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Transistor as Momentary Switch Wemos D1 Mini Reset

I am trying to create a water alarm based on the Wemos D1 Mini and an off the shelf water alarm. The basic premise I am trying to accomplish is when the sensor creates a circuit this then causes the ...
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109 views

PCB review + Analog/Digital separation?

I have built a PCB using this schematic used to charge a small wireless device. This schematic is based on this Texas Instruments evaluation module: https://www.ti.com/lit/ug/slvu928c/slvu928c.pdf?ts=...
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80 views

Trying to understand a transistor data sheet

So I have been researching on how a bipolar NPN transistor work. Here are my understandings: In order to turn on a transistor, you need to apply a voltage (from base to emitter) to overcome the ...
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141 views

How to create a circuit to automatically raise/lower a height-adjustable desk?

Background Hello everyone, I'm working on a small project where I can control the height of a height-adjustable desk using a microcontroller, MOSFET transistors, and an ultrasonic sensor. Essentially ...
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76 views

Do constant current LED drivers consume significant current when all outputs are disabled?

I'm trying to understand the datasheets for several shift-register constant-current LED drivers, such as TLC59281, TLC5916, CAT4016, IS31FL3726. All of them have something similar to this in their ...
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58 views

How can I make a power system efficient and safe? [closed]

I am currently designing a power system and so far I have been using fuses before relays to protect against high current. Those relays lead to multiple loads to power. I was thinking of adding a ...
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How are hybrid parameters defined?

I was reading about H-Paramters and how they were essentially defined and couldn't quite understand this bit in the picture below. Here are my questions: Shouldn't Δv_BE = Δv_be as V_BE is constant (...
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64 views

Switch that triggers at 2V

I have a piece of electronics that acts as a event sensor and its trigger voltage starts around 3.3V. Lets say that I want to little bit hack this device and hook it up to a button that is on other ...
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207 views

What happens when base voltage is higher than the collector voltage in a bipolar NPN transistor?

Does the base voltage has to always be (0.7v) in order for a bipolar NPN transistor to work? what happens if the base voltage increases or decreases? I'm really not into the technical stuff I'm just ...
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120 views

What parts/sections of a CPU take the biggest number of transistors?

I was surprised to hear CPUs only have a number of ALUs. What are most of the transistors in a CPU dedicated to?
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1answer
198 views

Unable to find MOSFET type and specs

Recently I've been trying to fix a motor-controling board in my pool cleaner. After some measuring, I've figured out, that two MOSFETs are behaving strangely and their behaviour varies from the other ...
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75 views

How to calculate base resistor of a NPN transistor that drives a MOSFET?

I'm currently trying to design a circuit that allows me to control a water pump running on 12V through an ESP32 microcontroller. The GPIO pins deliver only 3.3V, so I ended up controlling a NPN ...
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What is the use of second transistor in this circuit?

This is probably not a good title, can you suggest me a better one? I have this circuit above, and I am supposed to find its voltage gain \$V_{out}\over V_{in}\$. But I don't understand what use the ...
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40 views

Applying Thevenin's theorem between 3 points

I'm studying about transistor polarisation and got confused by this application of Thevenin's theorem, can someone please explain why eT is between B and M and why Vcc stayed even though it's not ...
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66 views

Should a diode and/or transistor be used with an automotive (Bosch style) relay for accessory power?

I am a total beginner with electronics, so I apologize if this question has been answered already, I find similar questions but they seem to always be some variant and not quite what I am seeking, so ...
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22 views

Which N channel mofoset should i use for PIR sensor to turn on LED strip 12v 6A

As i am not a graduate of electronics i have no idea about the transistor that i need to use. Can anyone suggest which N channel MOFOSET should I use to turn on my 12V 6A LED strip. The output given ...
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37 views

Power saving circuit in pneumatic valve

I am looking for a pneumatic valve and I refereed a catalog. It has a power saving circuit in the valve and there is a circuit diagram and description of that. I couldn't understand how this power ...
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115 views

What to use instead of transistors [closed]

Hi guys I have a problem... I can’t seem to find a transistor powerful enough to take 10000v, what would I use instead? Or if you know of a transistor that would take 1A and 10000V please redirect me ...
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What's the reason for keeping a base line in optocoupler? [duplicate]

Image Source: https://www.vishay.com/docs/83725/4n25.pdf The pin no 6 of the optocoupler IC is connected to the base of the NPN transistor. Should I keep it open? Or grounded? Does it anything to do ...
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64 views

How to drive led with transistor?

I'm trying to make a very simple circuit to switch an led using a transistor. My supply voltage is 16v, my control signal is 3.3v from an esp8266 GPIO, and my transistor is a 2222a NPN. My led has a ...
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81 views

Detect RS232 lines activity

Trying to work out a simple LED indicator scheme for UART lines(3.3V) and wanted to know if this seemed appropriate. my signals baud rate can be vary from 9600 to 115200. I tried below circuit but not ...
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95 views

Hacking a Corsair Commander Pro [closed]

I unfortunately shot two Transistors of my Commander Pro because I drew to much current when I connected a pump to the fan-connector. Now I want to desolder these two transistors, but I can't figure ...
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80 views

How does one use a transistor connected in either series or parallel with the load in a linear regulated power supply?

Let's say using a transformer and a rectifier to bring the voltage supply to roughly 18 DC (little voltage ripple which solved by using polarised capacitors) and I use a LM7812 regulator to bring down ...
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127 views

Understanding the 2N2222 transistor, Where is this voltage coming from

I was using Proteus to simulate NPN transistor then I saw this Both Switches are open. Why I see 3.12 Volts
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170 views

How to electronically generate exponentially growing sinusoidal signal

How can we generate exponentially growing sinusoidal signal (further describes below equation and ) using a simple analogue circuit (e.g. op-amps, transistors, or oscillator)? Mathematically, \$v(t)=...
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42 views

SMD component identification - possibly BJT

I found a defective SOT-23 on a broken PCB, but can't identify it. Probably a BJT, but what kind? The one on the right seems to be the same as the blown one. I would appreciate your help.
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291 views

BJT npn transistor circuit analysis

I'm trying to solve the following circuit, obtaining all the currents and voltages. I'm using mesh analysis method, but I'm ending with wrong results. So I assumed by default a clock-wise loop for \$...
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57 views

Why do electrons and holes in the base have to recombine in order to create the base current

Khan academy link In the video above, it is said, that in order for the base current to appear, electrons have to recombine with the holes in the base region. Why can't they simply go to the base ...
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410 views

Why are bipolar transistors used for switching applications?

I noticed that many sites targeted at hobbyists recommend bipolar transistors (mostly NPN) to switch things on and off. Bipolar transistors definitely have their purposes especially in analog circuits,...
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79 views

Built difference amplifier “tail” vs. SPICE models

I am working on a difference amplifier example lab 5L.1 from Art Of Electronics Hands on Lab Course (I am not a student). I simulated three types of "tail" circuits using SPICE. Then I built ...
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71 views

Scratched Transistor

I have an transistor that is used in mist maker circuit, but it's scratched for not understanding its model or numbers. how can I found out what type is this transistor?
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USB type-C Configuration Channel (CC) Circuit

We want a phone to be able to function as both a source and a sink of power. When using USB type-C, pulling the Configuration Channel (CC) to ground with a resistor causes the phone to become a source ...
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64 views

Transistor confusion

I am trying to control a 6v DC motor using Arduino, by feeding a PWM signal to the base of an NPN transistor hooked up to the motor circuit as shown in the schematic below. simulate this circuit &...
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1answer
94 views

Guitar pedal works by itself but not in a signal chain

I just built a clone of an LPB-1 pedal, as my first ever guitar pedal project. It works great between my guitar and amp with no other pedals in the chain. When it is placed in a chain with pedals ...
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66 views

How to boost my Lipo battery automatically when connected to a load?

Ibam using a Lipo battery to boost the voltage from 3.7V to 10V using a MT3608 module. Since the MT3608 module always boosts the voltage no matter if I connect the load at 10V. Is there a way where ...
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25 views

Issues with displaying graph ltspice simulation of CB characteristics

Sometimes when I simulate the CB or CE characteristics of a BJT, for the input and output characteristics I get a graph that is inverted (upside down) rather than looking the way it normally should. ...
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37 views

Designing a haptic feedback motor vibrator circuit

I'm having a Vive Virtual Reality device which has one digital output pin. Here is the specs for the digital output pin: My plan is to use a 2N2222 transistor connected to that digital output, with a ...
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159 views

Simple fast short circuit protector for circuit

I am trying to design a simple short circuit protector for the below circuit. Any short circuit simulated by switch SW1 turns off LED D2 only not LED D1. Currently both LEDs turn off and for safety ...

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