Anushri troubleshoot_LT1054 dead?
  • Hi,
    Currently troubleshooting anushri.
    With a 12V psu i’m reading -3,30V at pin 5 of LT1054.
    Also the LT1054 gets hot pretty quick…
    I’ve checked solder points of all condensors around.
    I don’t have a spare LT1054 under hand, is there anything I could check before swaping with a new one?
    Thanks

  • Check that your power supply really delivers 12V and not more…

  • I don’t think the 1054 is the problem here, but rather it’s quite likely that you have a short somewhere on your negative supply rail.
    Unplugged, you can measure the resistance between Gnd and -5v on the circuit. If it’s reading a low value, then you have a short. It could be some tiny tin ball, a reversed chip, etc.

  • Thanks for reply.
    MicMicMan, checked all chips using -5V, found one TL072 defectuous. Removing it give me correct voltage on negative rail.

  • Great news.
    Maybe you inserted it backwards. Beware, there might be no notch but a dot, which indicates the right polarity for the chip.

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