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Convert 10dbU to 4dbV with attenuation

Discussion in 'Electronic Design' started by Ben, Oct 18, 2006.

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  1. Ben

    Ben Guest


    I have two devices:

    One professional DAC converter with a output impedance of 51 ohms, 4dbU
    output which can be balanced TRS or unbalanced TS jacks, whichever is
    easiest for this.

    A consumer-grade amplifier which is 10dbV standard with 20k input impedance.

    I want to build an attennuator to convert the levels and add 35-40dB
    attenuation as well, to the signal.

    Been looking at a H-type attenuator, but not too sure on the resistors
    needed etc.

    Any pointers for the best way to do this?

  2. I'd stick two 5K pots on the output, and adjust so the red light
    doesnt come on.
    But a 40dB att is 100:1 so a 100R to ground and a 10K from the DAC
    will be fine, and with 1% tolerance stuff, no problems

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