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  1. xtp

    3 way speaker system

    The input data (what I know ;D): -Subwoofer: 20Hz-200Hz -Midrange: 200Hz-4000Hz -Tweeter:4000Hz-20000Hz The output data (what I'd like to know ???): -Subwoofer amp power -Midrange amp power -Tweeter amp power I'm using 36 dB/octave active band-pass filters to separate the frequency...
  2. xtp

    Dual op amp IC that works at 2.4V

    Cheap dual op amp IC with a maximum output current of 100mA that works below 2.4V or +-1.2V? ??? I want to build a portable preamp (also to be used as a headphone amp) that is very small and simple. The batteries are GP AA NiCd 800mAh.
  3. xtp

    NiCd Battery Powered LED Lamp

    Bright white LEDs must be supplied with min. 2.9V (@about 0.5mA
  4. xtp

    audio expansion circuit with split power supply

    Does anyboby have a schematic for an audio expansion circuit
  5. xtp

    ??? Audio Expansion Circuit ???

    Does anyone have a schematic for an audio expander that is not very complicated? I found one once but it had more than 100 components... Note: The Audio Expander is the opposite of the Audio Compressor.
  6. xtp

    ...about the 25W MOSFET(or HEXFET) amp...again...

    If I supply it with +-12V, I reduce the current of the 2nd current generator (Q5&Q6) ???, I replace the BD139-BD140 pair (Q6&Q7) with small power transistors and I replace Q8&Q9 with normal transistors what else should I change? More answers please...
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