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Recent content by vivaldez

  1. V

    Wireless fuel level detector for a storage tank

    problems with fuel sensing device Thanks for your replies. The ultrasonic suggestion seems very good. I found this: **broken link removed** It´s an excellent option for my purpose, but i need to incorporate a way to detect faster than normal lowering of level. Do you think the receptor...
  2. V

    Wireless fuel level detector for a storage tank

    Hi all I need help in designing a wireless fuel level indicator for a storage tank. I have thought in an hermetic device fixed inside the tank, in the bottom with some kind of pressure sensor. So, i can monitor the changes in the fuel weight and send an rf (could be fm) to a receiver outside...
  3. V

    Digital voltage comparator

    LCD display. An alarm for under and other for over. Led, relay or buzer. Up/Down select type. Victor
  4. V

    Digital voltage comparator

    Thanks for your reply I would prefer 0.5 volts. Victor
  5. V

    Digital voltage comparator

    Hi all. I need help in designing an over an under voltage alarm. I need to set an under and an over voltage with a pushbutton, using a display, and activate some kind of alarm when the set voltages are reached. I want a wide range of sensing voltage (1 to 70 vdc). Any help please. Victor
  6. V

    Help me design an audio oscillator that reproduces sound

    Audio oscillator Hi all I need to design an audio oscillator that reproduce the attached sound. This sound is used to promote growing in plants. I will appreciate any help. Victor
  7. V

    CDP UPSs and inverter

    cdp inverter Hi all I need service manual and/or schematics of CDP xverter and UPSs. If someone have information about linears power inverters would be helpful for me. Victor
  8. V

    Need schematic of 12V DC to 120V AC linear power inverter

    Linear Power Inverter Hi all. Recently I had in my hands a power 12vdc to 120vac sine wave output inverter, with linear technology. Have anybody information about that kind of inverter, schematics or something so? vivaldez
  9. V

    Help me build a circuit that simulates birds singing

    Birds simulator Hi all I want to build a circuit that can simulate the birds singing. Something similar to a technology called Sonic Bloom. They produce an oscillating sound of frequencies between 3000 and 8000 hz and amplify it to stimulate plants growing. I need some help in that order. If...
  10. V

    How to get schematic or service manual of Exeltech inverters

    Exeltech Have anybody information on how to get schematics and/or service manul of Exeltech inverters?
  11. V

    Help me in a design on PIC based calendar alarm

    RTC reminder HI ALL I need to design a pic based calendar alarm. It has to give a signal in a progammed date and hour. The idea is to use this circuit tas a reminder of medical dates or similars events. I need to get a cos effctive design. Thanks i advance.
  12. V

    Looking for schematic/manual for Verifone card reader

    verifon manuals I need schematic or repair manual of verifone (card reader), with power supply and printer. Thanks in advance.
  13. V

    Cascading boost converters in series

    cascading step-up converters I think a better aproach would be a push pull step up converter. With push pull there are less magnetics components.
  14. V

    How to build a mosfet based SSR to be used with AC voltage?

    MOSFET BASED SSR Someone knows how to build a mosfet based solid state relay to be used with ac voltage?
  15. V

    Microcontroller project - please suggest something

    Re: Microcontroller project And install Proteus software and run some samples on 8051. Could be helpfull in codes understanding.
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