Search:

Type: Posts; User: anotherbrick

Page 1 of 8 1 2 3 4

Search: Search took 0.02 seconds.

  1. Closed: Re: how to eliminate oscilation in current measuring circuit ?

    I finally got rid of oscillations at Current Transformer amplifier output
    I put baypass caps at Opamp power supply pins
    and 100 pF caps between (-) and (out) pins

    my scheme is a simple half...
  2. Closed: how to eliminate oscilation in current measuring circuit ?

    hello dear forum

    154027

    I try to measure output current of 28 KHz half bridge inverter with current transformer
    the 1. opamp amplify current transformer output 2. opamp pass only positive...
  3. Closed: which switching pattern for DC brush motor ?

    hello dear forum,

    I drive a 24V dc brush motor with H bridge

    153046

    I use switching pattern 1 but this time the lower MOSs get hot, upper stay cold
    can I use switching pattern 2 ?
    what...
  4. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    @Klaus @FvM

    hello thank you for your advise:smile:
    however I didnot take pencil and paper but I opened MS Excel :idea:
    and calculated R_motor with FvM's formula
    and it worked really

    151461...
  5. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    @FvM
    thank you for your answer

    //// Imot,avg = IDC,avg/D \\\\\

    is there a webpage or book, where I can find this equation and theoretical explanation of this ?
  6. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    @Klaus: I wait 3 seconds until circuit stabilize
    the ACS circuit is at the input to the H bridge

    @FvM:
    there is an electrolytic capacitor parallel to H bridge C18 1000uF
    U10 is ACS current...
  7. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    0.141 duty

    gates
    151357

    motor Voltage and current
    151358

    I have one question ; should not the current waveform be like this ?
  8. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    I locked the rotor and give different duty and measured average , max and min motor current
    I have 750 W transformer 220 / 24 V which I rectify and apply to circuit

    I took 30 measurements in 100...
  9. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    hello ,

    gate signals of one leg ( the other leg Low MOS always ON )

    151333

    IR2183 driver has 500 ns deadtime

    motor voltage and current waveforms (ACS sensor output)
  10. Closed: Re: how to match calculated and measured current of a brush DC motor ?

    hello ,

    Where can I find the formulas for calculating the average current ?

    my final goal is to find the speed of the motor from current measurement

    thank you
  11. Closed: how to match calculated and measured current of a brush DC motor ?

    hello dear forum,

    I have a full bridge driving a 24 V DC brush motor

    I have measured the max current of H bridge with ACS sensor with STM32 uC
    and wrote down for four different duty of PWM
    I...
  12. Closed: Can I protect VDS of MOSFET with TVS diode ?

    hello dear forum,

    I drive 24 V brush DC motor with H bridge - frequency is 10 Khz

    the current can raise to 50 amperes

    the VDS voltage rating of mosfets is 40 V

    my question;
  13. Replies
    5
    Views
    418

    Closed: Re: ramp generator question

    hello thank you,

    I dont want Vout exeeds Vin

    Vout must be equal to Vin at the end of ramp

    is it posible with integrator circuit ?
  14. Replies
    5
    Views
    418

    Closed: ramp generator question

    hello dear forum,

    I want to design a ramp generator

    here is my circuit and the simulation result

    150130

    my question ;
  15. Replies
    5
    Views
    714

    Closed: CO2 sensor recommendation ?

    hello dear forum,

    I want to measure CO2 in greenhouses

    can you recommend a professional quality CO2 sensor ?

    suited for this application

    thank you
  16. Closed: what is the best bus choice for inter-PCB communication ?

    hello dear forum,

    I have been asked to design modular I/O boards
    for a PLC like device distributed to many small PCBs

    the I/O modules will be unintelligent 4/4 digital I/O , 4/4 analog I/O ...
  17. Closed: Re: how to eliminate 50 Hz Power Supply noise ?

    after the diff. amplifier I must take the the envelope of this 100 KHz signal and amplify it again

    is this posible with high pass filtering the diff. amplifier output ?
  18. Closed: how to eliminate 50 Hz Power Supply noise ?

    hello dear forum,

    I am trying to amplify the difference of a 100 KHz signal signal from 2 identical coils

    ( I am trying to build a metal dedector - when metal enters the 1st coils inner , one...
  19. Closed: Re: help! - triac dimmer circuit firing parasiticaly

    ultrasonic transducer is a capacitive device but I insert inductor in series
    to operate it in resonance approximately

    secondly if I remove the 0.2 uF capacitor it gets worser - more parasitic...
  20. Closed: help! - triac dimmer circuit firing parasiticaly

    hello dear forum,

    I try to build the following triac dimmer
    which controls the power input to a 2 KW 28 KHz ultrasonic inverter

    148563
    148564

    the ISIS circuit detects the zero crossing of...
  21. Replies
    16
    Views
    2,617

    Closed: Re: which type of metal dedector circuit?

    hello dear forum

    here is the result of my PI metal dedector

    as you can see in the video

    https://www.youtube.com/watch?v=f15lLBQ9SOw&feature=youtu.be

    it can dedect big metal parts but in...
  22. Replies
    16
    Views
    2,617

    Closed: Re: which type of metal dedector circuit?

    hello dear forum,

    I assembled the 1st prototype of my puls induction metal dedector

    as you can see in the video below ( only 1 min )it can dedect big parts but in the end of the video it cannot...
  23. Replies
    16
    Views
    2,617

    Closed: Re: which type of metal dedector circuit?

    "Uses CR coil for reliable detection and is cost effective for the examination of bulk material in gravity free-fall applications."

    Low-cost triple-coil separator offers superior sensitivity,...
  24. Replies
    16
    Views
    2,617

    Closed: Re: which type of metal dedector circuit?

    I am trying to produce this dedector - what is your advice please? what type of dedector shall I use ?
    ...
  25. Replies
    16
    Views
    2,617

    Closed: Re: which type of metal dedector circuit?

    I dont want to detect the type of metal
    I want remove the residual metal particles just like you mentioned

    which type of detector is best for this job ?

    thank you
Results 1 to 25 of 198
Page 1 of 8 1 2 3 4