circuit design

  1. D

    Up/Down Counter with 2 input sensors to trigger clock

    Hello, can you help me with this project? I want to design a circuit which counts up when the ENTRANCE SENSOR detects an object and counts down when the EXIT SENSOR detects an object. I created the circuit design attached below with the help of some tutorials on YouTube but I do not know what...
  2. I

    T.I. BLE USB MCU Programming Trouble (CC2540)

    Hello Everybody! I am trying to program/communicate with the CC2450 BLE IC, which is a transceiver/microcontroller. My computer is having trouble recognizing the device. It does not show up in Device Manager. I've tried the T.I. tools for trying to communicate with it. I've downloaded the BLE...
  3. D

    can someone help me with this diagram?

  4. W

    MOSFET allows current through even when turned off

    Hi, I'm relatively new to circuit design and I'm trying to create a circuit to turn on/off a 6V DC motor using a microcontroller. To do this, I am using an N-channel MOSFET. The MOSFET appears to be working, because the drain to source resistance when the gate = 0V is ~10 MΩ, and when the gate...
  5. R

    If you can Help! ?o design an Automated system

    I need to design an Automated system such that a user gives inputs in 3 bits and there's a clock running that resets itself and gives a positive signal after the time indicated by input. We can use logic gates, combinatorial circuits, sequential circuits, counters, registers.
  6. katerineblankca

    Confirming Circuit Configuration.

    Hello, I am in a research team and is designing a circuit system for powering a motor with battery and supercapacitor. The battery and supercapacitor powers the motor separately and the motor gives regeneration power back to the supercapacitor (motor driver allows for regen). Can experts in this...
  7. Nikolas_

    Battery charger circuit design

    Hey, so I am trying to design and build my own battery charger for 4 cell LiPos (including HV-LiPos with 4.35v/cell) but I don't have a lot of experience with circuit design. I designed this circuit so that it can either supply a constant voltage or constant current to the battery with the...
  8. A

    Product Circuit Design

    Hi, I am currently completing a project and require assistance with the electrical circuit design. Not sure if this is where to ask but currently unsure where else i can ask and I am clueless. I have supplied information below but I may have made mistakes. The components required are: Power...
  9. M

    3.3v PWM to 10V to drive Power MOSFETS with Low Rds on?

    Hello, I am designing and developing a low voltage Battery management system . i have designed whole circuit but in one small thing i am stuck. kindly help me answering it. Battery Pack specifications: 36 V 2.5 AH 10s battery pack. maximum voltage : 42 v Minimum voltage : 30v Power rail...
  10. J

    Please help! 3-Phase rectifier + buck converter

    Im making a project where I need to rectify a 3-phase generator and charge a 12V battery. My buck converter is simulating fine using a DC source but when I connect my rectified power supply it messes everything up. This is my rectifier output. This is my schematic This is my rectifier's...
  11. Lambo Av

    Circuit Breaker Location

    Hi, in IEEE 3 bus, why are circuit breakers connected at the 'load' rather than connected at the 'generator and load'?
  12. G

    Which software for PCB CAD design do you prefer? Which software do you use for your projects?

    I have always used Eagle for my designs because it is free, well supported and nice UI. Recently I received a design in Kidcad which I tried to export to Eagle but I was unable to do so. Then I thought, hey! why not using Altium, because I see that most of the job offers for Hardware design as...
  13. C

    Triangular signal cutting off

    I made a circuit to demonstrate the work of a 555 and a constant current regulator and wanted to add triangle wave input. I've done that by integrating the output of a 555 timer, and at the node 'tri' I do get the desired triangle wave of ~ +-8V. Since I want the the voltage positive at all...
  14. G

    Design of 8-bit shift register

    Hi! I'm a student of Electric Engineering and I got a problem on a Electronic project. I have to make an 8-bit shift register with serial input and serial output. The basics of the project is that it has to have two push buttons: one will be a logic 1 and the other a logic 0. The shift register...
  15. I

    Designing Step Up Flyback Transformer Help

    Hi. I am trying to build a power supply which output is 2000VDC and 20mA (40W) input is 220V ac (european input). I thought I can use flyback transformer. And I started to design. I selected duty cycle as %50 and frequency as 50kHz (actually I don't know how to select frequency and duty cycle...
  16. System/360

    What is Pull up/down?

    What does pull up mean? In circuit examples, for example for a ESP8266 chip, pull up is connecting to Vcc through a 10kΩ resistor. Why 10k? How is this value derived? I have seen two separate cases of pull down. One connects to a 10kΩ to ground while another connects directly to ground. Hope...
  17. D

    RE: PCB to external connection

    Hi, I need to connect 5 wire from pcb to outer terminal, whether soldering the wire is a better method, or is there any other method for connecting the wire with pcb. it should withstand even in hard environmental conditions. Thanks, D
  18. R

    Slayer Exciter using darlington pair

    Hi guys, this is my first post here. I hope I'm in the right section. I've made a slayer exciter with a 22kohm resistor, a 2n2222 transistor, using a 9v battery. My secondary is 0.25 mm and 10 cm in lenght. My primary is 4 turns. I wanted to obtain some sparks, and I added a 47k instead of 22k...
  19. T

    how to determine the small signal parameters(gm, ro) of nMOSFET from Datasheet?

    as I want to calculate the transfer function of circuit that is meant to generate source current using an Op amp as control loop, I need the gm and r0 of the mosfet(to determine the transfer function of the Op amp current source with nMOSFET) here is the picture of MOSFET with showed parameters...
  20. Engineer wannabe

    Help with DT Project (includes an inductive charger).

    Hi Everyone, my DT project includes an inductive charger. I would like to build a circuit that when a voltage is received from the inductive charger (9Vdc in ~5Vdc out) one LED blinks then after 10s it remains constant. Then turns off when voltage is stopped. I’m not entirely sure how to go...
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