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Recent content by elecfan

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    2-way analog intercom

    for the moment I am using MAX9814 as preamp and TPA3110 as amp. is almost similar to what ghasemghasem is explaining, in his/her post above. the idea was to see if using a dual channel preamplifier with channel priority, can help to avoid the loop in the circuit. this should help to turn off...
  2. E

    2-way analog intercom

    The system is going to be designed for over counter communication . In one side close distance of speaker and microphone is required.
  3. E

    2-way analog intercom

    Dear all I am working on a 2-way analog intercom, I need a suitable 2-channel pre-amplifier with AGC. I am trying to use a half duplex communication, with channel priority, in order to avoid laud noise of the speaker your help will be appreciated Best regards
  4. E

    best practice in redundant microcontrollers!

    if I use the above config, and send the data from both micros to the computers, via four different CAN buses, shouldn't be enough to rely on what is provided in the computer? or still you think it is necessary to keep a backup on the electronic boards as well? In this case, keeping the master...
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    best practice in redundant microcontrollers!

    Many thanks for your comment. is the reference you mentioned a paper or technical report? Unfortunately I could not find it in google. Best regards
  6. E

    communication port redundancy!

    for the board at the left, I am considering two boards (master and slave). for each board (i.e. microcontroller), two CAN ports, one of them goes to BUS A and the other one to BUS B. For the right side, I did a mistake in drawing. there should be one connection from each BUS to the computers...
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    communication port redundancy!

    Dea All I am using the following config in order to improve the reliability of my system. two redundant micros are used, where each one provides two CAN based data port. in the right, three computers are receiving data through a concentrator, which received the data from micros, compares them...
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    best practice in redundant microcontrollers!

    best practice for redundant microcontrollers! Dear All I am going to use two ARM micros in a redundant configuration, in which the slave micro comes to service, when the Master one fails to operate, or fails to provide an output. since the operation needs to use the processing history, I have...
  9. E

    RS232 smart switch design

    I am not sure which one is preferred and is a more reliable way. I was thinking of controlling the signal level of DTR.
  10. E

    RS232 smart switch design

    I am going to design a smart RS232 switch. the board should have one RS232 input and two RS232 outputs. the output port should be switchable manually and also automatically in a way that gives priority to one of the outputs. whenever the high priority port is connected, the other one should be...
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    Final Year Project On Sensors

    it depends on what area you would like to work on. the signal processing part, design of sensors, new applications? but working on a multisensor system, such as building management system or road traffic management, can be intereting if interested on image processing, stereo vision or...
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    advantech fanless computers and port considerations

    all the cables and kept just one (USB or VGA) I see the same problem with both cables. when I plug them in, the V- and ground get shorted. this connects all the V- wires together and to the ground. best regards John
  13. E

    advantech fanless computers and port considerations

    Dear All I am facing a problem in connecting VGA, com and USB connectors to my advantech UNO-2178 computer. the problem is that after connecting the mentioned connectors, the V- and field ground terminals get shorted. any idea if this is a hardware problem ? from the connectors or from the...
  14. E

    protection of electronic Box against EMI

    Many thanks for your valuable comments and advises on the locomotive, all the electronic equipment (including high power and low power) share a common ground which is the structure of the loco. in order to provide a level of protection, is a complete isolation of my electronics boards from the...
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    protection of electronic Box against EMI

    Dear All I am installing an electronic box, including analogue and digital boards, computer and modems, on a locomotive. the box collects signals from several sensors installed around the engine. (from 3 meters to 15 meters of distance) the box is from steel. I would appreciate your advises on...

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