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Recent content by alba800

  1. A

    125KHz rfid circuit design

    rfid circuit I have seen RFID readers/writers with 1 transistor as oscillator and 1 LM324 working as detector, very fast and nice design. Anyone has a schematic? Thank You in advance
  2. A

    how to read data from rfid tag

    nxp mfrc500 rfid you can start looking at Philips (NXP) HTRC11001 it's a simple IC that needs a small microprocessor for data handling. it works at 125kHz bye
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    losing data with a TNY264 power supplier

    hello, I recently made a project with an ATmega64 microcontroller powered by an off-line switching power supply (230V) made with a Power Integration's TNY264 chip (as per application examples, there a PI filter at the input. what happens is that sometimes the ATmega goes to reset or LOSES...
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    Looking for RFID TAG reader that works at 3.3 volts

    RFID TAG reader Hi, so far I have been using the HTRC1100 tag reader chip from Philips for 125KHz transponders. Now I have to design a new board but the power supply has to be 3.3Volts. Do You know of any similar IC that works at 3.3 volts? thanks in advance. Alba800
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    what means the following warning?

    if you want to write something from an external bus into the DATA vector you have to put it into three state, using some direction control signals that disables DATA outputs. eg: if (wr= active )then data<="ZZZZZZZZ"; otherwise the DATA output buffers are always enabled and you get a conflict...
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    the FPGA's GCLK signal don't use as normal IO?

    fpga gclk The synthesizer detected a signal used as a clock source, so it synthesize it as a bufclk. once you go to the implementation, ISE finds that a bufclk cannot be put on that pin. just instruct the synthesizer (in your source code) not to use a bufclk for that signal. This can be done...
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    Solution for multimeter with MAX134 that doesn't use mechanical switches

    Hi everybody! I am designing a digital multimeter with a MAX134. My problem is that I don't want to use any mechanical switch or relay when changing the measuring function from voltage to current. any idea? thanks in advance alba800 Added after 7 minutes: SORRY.. I made a mistake writing...
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    save time when the power goes off

    have a watch in the microchip web site, the DS1302 and family could be what you are searching for. bye alba800
  9. A

    Solutions for automatic button pushing in a telephone

    Re: pushbuttons.... I think the reed relay is the best solution, it gives You insulation and no problems related to the matrix topology of the keyboard. bye
  10. A

    short range wireless video

    You mean that I could generate 4 analog levels to be sent to the TX module, then get them from the receiver module, convert these signals into digital symbols (ADC, comparator) and use them? Nice idea, especially if those AV modules are cheap. Thanks a lot Alberto
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    How to control the power-up in some sequence?

    You could use a P mosfet as a switch between vin (source) and vout (drain), the gate should be vin delayed by an RC network. bye
  12. A

    Automatic car window opener/closer

    automatic window opener circuit take a motor driver from ST, with a shunt resistor you can get the motor current, use a comparator (or an analog channel of the micro) to see when the current is more than what is needed to move the window. A small microprocessor can handle the logics of the...
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    short range wireless video

    Thanks for your suggestion, but I still think that a digital transmission could give me more security and flexibility. I can handle FPGAs for compression but I don't know what to choose for the communication. thanks
  14. A

    short range wireless video

    short range wireless video transmission so far my intention is to use a color TFT display, then I need to interface it with a controller. what about a digital transmission? regards
  15. A

    short range wireless video

    kd2bd modulator Hi everybody, I need to design a short range (4-5 meters) wireless connection from a camera to an 1/2VGA color LCD display. Which is the best way? analog transmission? digital with compression? bluetooth? thank You for Your suggestions!
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