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Recent content by Smart

  1. S

    2 input mixing audio amplifier

    For example Input B is an audio of a radio. And output is Signal B, which is amplified. When Input A, which is Signal from a Microphone, is active, then the Radio signal should be cut off and output should only be Signal A.
  2. S

    2 input mixing audio amplifier

    Hi, I am looking for a 2 input mixing audio amplifier. When "input A" has a signal, Amplifier should not amplify Signal B. The amplifier is used in car and should be low noise. Regtards
  3. S

    Please suggest any solution for Electronic Noise in BUS

    Re: Electronic Noise in BUS Would you please let me know the noise band in the transportation bus vehicle? We used DC-DC converter, but it still can not protect the electronic boards from the noise. The timekeeper loose data because of negative overshoot. The board make error because of noise...
  4. S

    Data loss in DS1302 timekeeper - how to avoid

    Data loss in timekeeper Hi, We use DS1302 timekeeper in an electronic device in bus. We use a 3.3 V battery to provide voltage for timekeeper. But many times, the data of timekeeper is reset. Can anyone help me to avoid this
  5. S

    Please suggest any solution for Electronic Noise in BUS

    Electronic Noise in BUS Hi, Who has experience in electronic noise in the bus? We designed an electronic device in the bus, but electronic noise in the DC voltage, in the bus has bad effect on our devices. Regards
  6. S

    Postgre SQL or ORACLE

    we have 400,000,000 record of 25 bytes, each record also have 7 fields of data. please let me know if Postgresql can answer our needs or we should go to Oracle?
  7. S

    Electronic article surveillance

    I also need the antenna design of an electronic article surveillance gate (30 point to email : smartcard@gmail.com)
  8. S

    interestED on automated car wash using Smart cARD PRoject!!

    Re: interestED on automated car wash using Smart cARD PRojec PM me, I can help you in design and build
  9. S

    Which type of RFID readers should I use to pinpoint the location?

    Re: RFID question You can use different reader and antenna for moving object in building. Also some reader can support up to 4 antenna which you can prevent more cost. But as you said the UHF reader price is high. You can also use low range wireless transceiver, which is very cheap.
  10. S

    RFID certification course

    You can use SMART WORLD ACADEMIC Go to **broken link removed** for more information
  11. S

    13.56 MHz RFID schematic circuit

    Re: 13.56 MHz RFID reader You Can use infineon Chip : SLF9000 for ISO 14443 Mifare RFID
  12. S

    Can we use RS-232 port for the distance of 30 meter for sending data?

    can we use rs-232 port in the distance of 30 meter for sending data. regards
  13. S

    open a parking gate with PC

    Hi, I want to control a parking gate (24 volt relay) with a pc.The distance between pc and barrier gate is 30 meter. At first please let me know should I use microcontroller or RS-232 can control the relay itself. then please send me the needed schematic and source code. regards
  14. S

    controling 2 relay with microcontroller

    I need complete schematic and code for a microcontroller which has a link with a pc via RS-232, and pc send a command for microcontroller to control 2 pcs of 24 volt relay.
  15. S

    The cost and range of 900MHZ RFID

    Re: 900 Mhz RFID Range is up to 8 meter and the price is 1500$ with antenna you can contact with Smartcard@gmail.com
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