transistor

Hello! In a project I want to use a DFPlayer Mini for a sound effect. Since (if possible) I don't want to use an extra microcontroller I wanted to use the I/O-Mode of the module but still trigger it digitally. The Play-Function is triggered when a specific pin is pulled to GND through a 33k...

Hello everyone! Due to very low leakage current requirements, in nA range, and high voltage of around 100V, I cannot use normal ESD diodes for protection. So, I was looking at Avalanche transistor and wanted to use its collector-base junction as a ESD diode. I came across FMMT41x series of...

I've been reading Ravazi's book Design Of Analog CMOS Integrated Circuits. regarding the end of chapter 3 (Single-Stage Amplifiers), the book presents the folded cascode (Page 90) I had a question, regarding how to determine the state of transistors in large signal analysis. I wrote it in...

hello, I have an analog electronics exam, and i hope that someone might help me understand the course thank you.

Oii, alguém tem o modelo LTSpice preciso para TIP122? Desde já, agradeço!

Hi, I'm a physics student, and I have a small problem for a lab that I have to solve. Here is my problem: I must create a circuit which uses capacitors to gradually close a light, but in addition, we must pass the current from the capacitor which discharges by the base of an NPN transistor. A...

Hi folks, Since I wanted to revise the basic configuration of BJT, I read this chapter from Purdue University based on the Book of Sedra (https://engineering.purdue.edu/wcchew/ece255s18/ece%20255%20s18%20latex%20pdf%20files/ece255Lecture_13_Feb27_BJT_Basic_Config.pdf) at page 13 where he wrote...

I need help with the following circuit problem: Find the time response of the circuit. Write the Laplace transform of the circuit equations. Attached is the circuit diagram and its equivalent transistor model. Any detailed steps to solve this would be greatly appreciated! Thank you!

Hi! I am trying to make my Arduino Nano switch the device where it is currently communicating with (RX-TX) and I want to make it using NPN Transistors (2N3904) to switch from the ESP-01 to HC-06 (Bluetooth). I'm kinda new to this and I made this circuit - for ESP-01 only for now with the same...

I have been tasked to design a multistage amplifier with the following specifications: Gain(V/V) = 30, Rin = 20 kohms, Rout < 25 ohms, Power supply = Dual +12V -12V, Max Symmetrical Swing > 9Vpp (peak-to-peak), lower 3dB down point < 200 Hz, Upper 3dB down point > 5 kHz, Rload = 200 ohms. I...

Hi All, I am designing a ATmega328P based PCB control board that has a function of sending and receiving discrete digital signals to and from a PLC. The PLC has sinking outputs. The PLC can accept sinking or sourcing inputs. I want the PCB to output Sourcing (PNP) signals to the PLC. (mostly...

Set your multimeter to diode mode. This activates a small forward bias voltage, mimicking the typical operating condition of a transistor.

Hi! I am working on a university project. We are building a vehicle similiar to the BattleBots competition. Everything is working well but I have a problem with a 12 VDC motor controlled with transistor/MOSFET. I am using this motor water pump...

Hi, I am trying to make a simple fm tuner as per the circuit diagram attached. Problem is, BF494 transistors are not readily available in my locality. Hence, I have used 2N3904 transistors as an alternative choice but the tuner doesn't seems to work. Can this transistor be used in this circuit?

i have a sony stereo electret condenser from the 70s. one of the transistors has failed but i cannot identify the transistor. can anyone help? the code reads K39A CI2 the microphone is an ecm 99 if that helps.

Hello, I'm a computer science student and I was assigned by my professor to make a monostable multivibrator circuit on a bread board with an unstable duration of three seconds. Keep in mind I have very little knowledge about circuitry, we were only given the schematic and were told to find the...

Hello everyone, I have next to no knowledge of electrical eng or circuitry and am having some trouble with my homebuilt arcade. The essence of my problem is that I want to wire both the computer and monitor to the same rocker switch. The monitor turns on via a button press that completes a...

Hello Everyone, I am fairly new to this so please bear with me. I have been looking at reducing the static power consumption in an IC, and have been mainly focussed to reduce the parasitics in the wiring in the BEOL. However, I was wondering that whether in the FEOL, on an n-type transistor...

I am trying to build a circuit to emulate a lipo battery. Basically the circuit consists in a power supply to emulate the discharge behaviour and a variable load to eulate the charge behaviour. This is the circuit in a simplified way This basically generates 2 circuits...