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Mono amp feeding both stereo and mono headset without shorting out

Discussion in 'Audio' started by WadoAdi, Dec 23, 2017.

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  1. WadoAdi

    WadoAdi

    5
    0
    Nov 30, 2017
    Hi,
    I have a what I thought would be a common issue and easy to find the answer on google but i can't !

    here is my issue I have a small self-build headset tester which has a mono output which connects to a panel mount stereo jack socket, I wired the ring to ground and the tip and second ring to the output, this works well when the headset has a stereo plug. However some have a mono plug which results in the second ring shorting to the ground and killing the output.

    I need both channels fed for the stereo headsets but need it to work on the mono ones too!

    How could I solution this, could I link the left and right channels with a small capacitor or would that not work?


    thanks
     
  2. dave9

    dave9

    907
    230
    Mar 5, 2017
    Seems most straightforward to just add a 2nd, mono jack in parallel.
     
  3. WadoAdi

    WadoAdi

    5
    0
    Nov 30, 2017
    thanks and yes that would work as would adding a mono and stereo switch, however I really would like to use a single jack with a minimal of extra components and nothing further in the panel...

    if I was to feed each channel via a 5K or 10k resistor?
     
  4. Alec_t

    Alec_t

    2,844
    760
    Jul 7, 2015
    I assume each 'channel' is intended to drive a respective earphone directly. If so, such a high value would severely attenuate the signal, since the 5k/10k would form a voltage divider with the earphone impedance (typically about 32Ω). I'd try 33Ω in each channel.
     
  5. WadoAdi

    WadoAdi

    5
    0
    Nov 30, 2017
    @Alec_t thanks I will give that a try the headsets i'm using it with have an impedance of 300Ω and i thing i have some 280Ω resistors in bits box so will try them...
     
  6. Alec_t

    Alec_t

    2,844
    760
    Jul 7, 2015
    Those should suit.
     
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