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zadrian

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Posts posted by zadrian


  1. [attachmentid=4204]

     

    Heres the schematic,so you will know whats required.

     

     

     

    Audio

    -all three opamps take input from one source, from the mini jack input.

     

    -three volume controls, each with amplifier capable of delivering enough power to headphones, or use as a pre-amp for speakers.

     

    -optional bass-boost. for no bassboost, just short output to r4, hence the switch.

     

    -use ic sockets, so user can change opamps, take note some opamps cannot run under 5v from usb.

     

    Power Supply

    - technically usb supplies 5v @ 500ma, more like 300ma in real life, still its enough to power the amp.

     

    -three TLE2426CLP, one for each amp, basically its a separate buffered powersupply for each opamp.

     

    -1000uf is quite enough, to save costs u can go down to about 470uf, the more capacitance the merrier.

     

    -0.1uf decoupling capacitors, important to maintain stability of opamp.

    Pre_amp.bmp


  2. Hi, I would like to know if there are any persons here that helps to customize amps ?

     

    I could not find an amp to match my requirments

     

    1) 3x Outputs with individual volume control

    2) runs on USB (no need to be portable or can run w/o batt)

    3) input by mini-plug (interconnect) or USB (as a DAC for PC)

    4) bass boost (optional)

    5) no need room for opt amps etc.....

     

    Budget below SGD200 if possible

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