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  1. dmuxaf

    Class D Switching Amplifier

    The diff probe is connected across the load, which consist of actual resistors and a cap; the customer did not supply anything other than the .wav file. The current probe is attached to the line through the load (i.e. output of amp to load). I am using an oscope to take RMS measurements of...
  2. dmuxaf

    Class D Switching Amplifier

    I used the LTSpice simult simply for frequency response. I initially used it when putting together the output filter. I wanted to block the swx freq and have somewhat linear gain over the BW of concern (22.5kHz-27.5kHz), which, according to the LTSpice simult, the range is between 7.3db-7.8db...
  3. dmuxaf

    Class D Switching Amplifier

    I work, intern, in an R&D lab and was given a signal (.wav format) from a potential customer. They want the signal they provided to be passed through our amp onto the load they requested at ~50W. No, I did not run the .wav file out the sound-card; I'm using a NI-DAQ. I calculated and...
  4. dmuxaf

    Class D Switching Amplifier

    I should have mentioned this, sorry. But, the load is 500 ohms with a .01uF in series (odd, I know) and I need ~50W at the load. I checked the power supply rails and they are fine (i.e. no noise, sagging, etc...). I don't believe the output should or does heat-up and change any resistances...
  5. dmuxaf

    Class D Switching Amplifier

    I'm familiar with the basic theory of operation for class d switching amp's. But, for my project, I am inputting a modulated signal with a 5kHz bandwidth centered at 25kHz. I'm still waiting on some specifics from the customer as to what the signal is and type of modulation. Anway, I have...
  6. dmuxaf

    Voltage Regulators at -55C

    Hello. Does anyone know of some companies/manufacturers for regulators that are NOT in the TO-3, TO-39, and 16-DIP package and can operate at -55C? I've already tried the big name sites (national semiconductor, TI, etc..,). I anticipate there is a TO-220 package out there or possibly smaller...

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