Question for my course work (mac related)

Discussion in 'General Mac Discussion' started by martdaman, Oct 11, 2004.

  1. martdaman macrumors newbie

    Oct 11, 2004

    I do electronics for one of my subjects in school (year 11) and i have decided on designing and making a 200 watt amplifier for my emac. But what i need to know is the specification on the headphone jack, i ve looked on the specification on but it just says headphone jack 3mm. so can anyone help me?

    Thanks Martin

    P.S. if you want i will post pictures of the amplifier after its been made. It going to be white plastic same as my emac, i will call it iAmplifier

  2. ToddW macrumors 6502a

    Feb 26, 2004
    the 3.5mm audio jack that you will use to hook up to the output of the emac is standard. It has a type of pinout for the left and right channel and signal ground. I forget the pinout, but it should be the same for all 3.5mm audio jacks. Your circuit is going to be simple enough. I would look for some audio type op-amps for your circuit. Should relatively simple and fun. All the parts you should be able to get form radio shack or an online catalog place like


    This circuit looks promising:
  3. Blue Velvet Moderator emeritus

    Jul 4, 2004
    This is what you want:

    The headphone jack has the following electrical characteristics:
    • output impedance: 5.0 ohms (nominal)
    • maximum level: 1.5 Vrms (4.2 V peak-to-peak)

    Headphones should have an impedance not lower than the recommended minimum impedance of 32 ohms. Headphones with lower impedance can be used, but with some degradation in performance.

    Sound Specifications
    The frequency response of the sound circuits, not including the microphone and speakers, is within plus 1 dB or minus 3 dB from 20 Hz to 20 kHz.

    All from here:
  4. martdaman thread starter macrumors newbie

    Oct 11, 2004

    Thats is great infomation from both of you, my teacher will be pleased lol

  5. martdaman thread starter macrumors newbie

    Oct 11, 2004
    200 watt output

    can anyone tell me the out put of that 200 watt amplifier

    Thanks Martin.

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