Discussion in 'Radio Circuits, Repair & Performance' started by KD4YSH, Oct 22, 2014.

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  1. KD4YSH

    KD4YSH Ham Member QRZ Page

    I want to use the audio output from the sound card of a computer to trigger a relay a simple click audio file to operate a rocker relay and this will turn or off a device, what is the best way to do this? Is there a voltage present on the audio output? Thanks any help much appreciated.
  2. KH2G

    KH2G QRZ Member QRZ Page

    At the first click there will be a short bit of audio.
    This could be amplified and used to trigger a VOX circuit. If you do this, you will most likely have to put enough capacitance after your diode to get a bit of time delay.
    Dick KH2G
  3. WA7DU

    WA7DU Ham Member QRZ Page

    Is there a particular reason you want to use the sound card output? How about the RS-232C DTR LINE, which is meant for such things?
  4. KD4YSH

    KD4YSH Ham Member QRZ Page

    Hello how can I use this port with a DOS circuit? Please provide more info and I thank you for your time
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