Function generator power on/off damaging output pulse

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #1

    Function generator power on/off damaging output pulse

    http://youtu.be/1Ljz2ZSJoC4
    I had a close call there , and it could affect other function generators as well.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30911
    • Albion

    #2
    Re: Function generator power on/off damaging output pulse

    i have no sound on this pc, what voltage was that wave-pulse?
    and did it go negative first like it looked on the scope?

    Comment

    • TechGeek
      Computer Geek
      • Jan 2015
      • 2254
      • USA

      #3
      Re: Function generator power on/off damaging output pulse

      That was 12 volts power-on and 17 volts power-off.
      Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

      My computer doubles as a space heater.

      Permanently Retired Systems:
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      - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
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      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Function generator power on/off damaging output pulse

        I believe this happen in lots of generators unless it has output relay that drops out when unit is powered off kind of like audio amplifier with speaker protection relays.
        The output amplifier just putout pulses when power is removed.
        Attached Files
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

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