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Recent content by Vicky Susanto

  1. V

    oil transformer level circuit

    I tried to check the capacitance with my capacitance meter,I try to use a 1 cm x 1 cm (made from blank PCB). I know that air dielectric is 1 and oil transormer dielectric is 2.2 . With a resume of C = K *A /D ( which, K = Konstant dielectric, A = area, D=distance). When I measure the capacitance...
  2. V

    oil transformer level circuit

    https://obrazki.elektroda.pl/90_1289369135.jpg I only use the 555 for astable multivibrator. I made greater Ohm for the RA and RB. And I make small to the C1 about 20 pF Then I made parallel connection between C1 and CX ( probe that touch the oil). then I read the freaquency of the output. Or...
  3. V

    oil transformer level circuit

    Dear All, I want to make a level sensor for oil transformer, I just need 3 position that is Low,Med and High. I need some advice how to do it. And I have some suggestion from internet about this method that is : 1. using switch with ball or reed switch, but there is more difficulties in...
  4. V

    Robust and Redundant System

    I want to design a system control for hoist crane. i want to use a 89S52, this control will control two inverter using dac. I want to make one board with 2 controller inside, one for main unit and the other is for backup. if the main controller has a problem, the second one will take over all...
  5. V

    How to repair a inverter for motor 1 HP with error display under voltage?

    can someone help me how to repair a inverter for motor 1 HP with error display under voltage when acceleration,constant speed and deceleration? thanks.
  6. V

    13.56 MHz RFID schematic circuit

    Re: 13.56 MHz RFID reader In RFID there are some different protocol, which one you use in these protocol, ISO 15693 or IS0 14443 , or Tag-it protocol. And whar is your front end IC type?
  7. V

    13.56 MHz RFID schematic circuit

    13.56mhz front end I want to use IC RI-R6C-001A for front end made by texas instrument. And I want to use AVR ATMega 8515 for the controller. But It seem very confusing about interfacing this RF ic and the MCU.Have you ever try use this? Thank you for any answer.
  8. V

    13.56 MHz RFID schematic circuit

    rf id reader 13.5 Dear all, I want to make a reader for RFID that use 13,56 MHz. Can anyone give me some advice how to build this. Thank you
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