circuit analysis

  1. Topad

    Output logic source and sink

    Hi all, Im working to design a circuit that can sink after a load is apply, but when there's no load also be able to output logic levels 5v/0v. The max that a load could be is 12V and not not more than 100ma, therefore I decided to use octocapulers to make some output logic. In my attach image...
  2. E

    Help on Combination circuit

    Hi, I am in Grade 11 and I have been struggling with this circuit, and these kinds of circuits that splits at the large box into different resistors are the only ones that make me confused. How would I find the current and voltage of R2, R3, R4, R5, and R6? I already know there's 14.16V and...
  3. ajob

    What am I missing on my interpration to the following circuit?

    Well... I set up the following circuit and it didn't work as I expected. At this point, I'm no longer interested in "Why didn't it work?" question, but on "Why does it work like this?". Below I will describe how I think it should happen when I press SW1 and then I will tell you what actually...
  4. Hnaam

    Help figuring out suitable resistors for electric blanket controller

    Been racking my brain trying to figure out how this circuit works but I've just accepted its beyond my understanding. I need to replace resistors R1 and R2 as they're both open. Is there any way to figure out what the values of these 2 resistors should be? The blanket is made for 240v AC. Also...
  5. Topad

    Zener Diode voltage regulation

    Hi All, I have two designs using a zener diode for volatge regulation at 24V supply volatge. I like to know which is a better design to go with. Please see attach image. The load device is an active buzzer, that uses 15ma at 4v. Design #1: I have a shunt zener regulator using a resitor that...
  6. flaviodsilva

    Motor control using MOC3041 optocoupler

    I'm currently doing my master thesis, and I'm now at a point where I have to control a few AC motors with a microcontroller. From my previous study about the subject, and from previous similar thesis, I've noticed a common practice is to use an optocoupler to separate low voltage from high...
  7. student441

    How do I Find Vth With the node voltage method?

    Hello. I'am practicing circuit analisis about the norton and thevenin's circuits and I can't seem to manage to get the right thevenin's voltage using the node voltage for a) For the circuit in Fig. 4.111, obtain the Thevenin equivalent as seen from terminals (a) a-b (b) b-c resolution 1) I...
  8. T

    Field theory and electronics circuit

    Hello Guys, I was reading the article about the What is Electronics in the link : What is Electronics written by Ralph Morrison. I was stuck at the following paragraph called Field Theory. after reading it two times, I am still confused and could not describe with Maxwell equation what really he...
  9. Doubtician

    mesh current analysis in bjt circuits

    How to use mesh current analysis instead of thevenin's theorem here to solve for all currents and voltages in the following bjt circuit? How should i make the closed loops in order to analyse?
  10. marcell46

    Small signal analysis of MOSFET circuit

    The other day I got the following exercise on one of my exams: For those who don't speak German, for transistor 1 lambda is 0, but not for the others. The backgate-effekt should be neglected alltogether. I drew the following small signal equivalent circuit (ignore the black texts for now)...
  11. spacejedigundam

    how to Vernier TDC adjust every stage time differential to achieve 1 TLSB ?

    How do we get td1 - td2 = 2ns? I have no IDEA about how to adjust delay cell ,Thanks solving my problem , Thanks a lots
  12. Alejandro Pérez 1

    How does this simple circuit work (electric shaver)?

    Hi, I disassembled a battery-powered shaver but I'm having trouble understanding how it works from a circuit point of view when the machine is operating with the power cable plugged in. It has a 3-contact point 2-position (on/off) switch (sorry, I don't know its technical name). Here it is...
  13. T

    help, right equation to calculate a resistive circuit?

    I have reading started reading the book : Ten Essential Skills for Electrical Engineers by BARRY L.DORR. in the first chapter : How to design resistive circuit. int the proposed exercise 1.2 where I am stuck. I have assumed that the Voffset=VA is 5*3.3/8=2.0625V for Vs=0, to make my calculation...
  14. Swaysceptile

    How do I calculate the voltage across a diode?

    How do I calculate the voltage across a diode using ideal, practical, and complete models? What are the steps? I can't find any good tutorials/resources on the internet. I know the formula, but kinda confused with those many resistors. Hope someone could help
  15. enigmaHacker

    How to calculate resistance in the R-circuit ?

    In this simple R-circuit the voltage v = 24 volts, now I want to calculate R; for which I have tested multiple methods like KVL in all four meshes but I got stuck in KCL since direction of currents are not very clear. Thanks for your help in advance. Regards Sana Allah Kheiri
  16. D

    Simple Timer Circuit - Will this circuit work?

    Hi Guys, So I've been trying to wire up a simple timer circuit on a breadboard. I'm a complete novice so I'm just following youtube Tutorials. I found this one video which shows how to do it but It's a little over simplified so I had to fill in a lot of the gaps which may be a source of...
  17. pidgin

    Circuit review/analysis for a stepper motor auto-enabling and time-delay mechanism.

    Hi people :) I would love some help reviewing my little circuit.. I have a stepper motor driver (TB6600) which has an "ENABLE" function. It has an ENA- that is supposed to be connected to the ground, and a ENA+ where you supply the signal for ENABLING or DISABLING the stepper motor connected...
  18. D

    Will this simple Piezo circuit work?

    Hi guys, Just wondering if this simple circuit will work as I expect it to. So this is for an engine, I'm utilizing multiple Piezo igniters to create a spark plug and I'm trying to figure out if this will work. I understand that this would be pretty easy to test I just don't have the...