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  1. Cappels

    Wireless Regulations in China

    A little clarification - this is a short range local pager, perhaps 10 ro 20 meters indoors. Who knows that the law in China says about this kind of transmitter?
  2. Cappels

    Wireless Regulations in China

    I am designing what amounts to a local pager to be sold in China, both Hong Kong and the Mainland. Key information that I am missing is technical and legal information concerning the operation of unlicensed transmitters in China and Hong Kong. I am looking to use some simple modulation such as...
  3. Cappels

    128Hz Bandpass Filter

    For the record, here is the experiment using the 7 bit Barker code, which also includes a phase-locked loop to phase lock to the incoming code. http://72.41.86.92/dproj/selflocksyncdet/Synchronous_Detector.html
  4. Cappels

    128Hz Bandpass Filter

    Here are a couple of lock-in amplifier experiments. I have also used a 7 bit Barker code, with some success, in place of the 1 kHz square wave shown in the experiments. http://72.41.86.92/dproj/dlmom/dlmom.html http://72.41.86.92/dproj/syncdet/syncdet.html
  5. Cappels

    Wrong colour on TV

    Your blue channel is intermittent. Its not degaussing or the blue gun (unless its an electrical connection to the blue cathode). The following assumes that your television receiver is a Cathode Ray Tube receiver, not a flat panel receiver. If its a flat panel receiver, the odds are that you...
  6. Cappels

    Using Digital images to count fish in water past a particular point

    Fule for thought: If you know enough about the fish you will be counting, you might want to estimate the mass of the fish by imaging from two orthogonal positions (top and side camers), then apply statistical methods base on the distribution of volume of the (X percent are y cc, m percent are n...
  7. Cappels

    Soft Start Circuit for Negative Power Supply

    Alternatively, you could use an N-chennel FET connected as follows: Source to -5V Collector connected to load (and decoupling to ground). Gate connected to ground through a large resistor. Capacitor connected from Gate to Source. A diode can be added across the resistor (cathode to ground...
  8. Cappels

    General Circuit Troubleshooting

    dw85745 (Visitor) Mar 18, 2002 When troubleshooting an electrical circuit are there some general rules of how to proceed: For example with a TV: 1.ÊÊSAFETY: It is my understanding by going from the HV anode (rubber cap on CRT) to Kine (Chassis) ground that this will discharge all HV caps.ÊÊIs...

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