ISO: Guitar-Synth DIY Project Help.

Discussion in 'The Projects Forum' started by knel8025, Nov 1, 2012.

  1. knel8025

    Thread Starter New Member

    Nov 1, 2012
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    Hello and thank you to all who take the time to read this.

    So, I'm building a "Guitar-Synthesizer" project from the terrific website Music From Outer Space. About a month ago I initially "completed" the project but it did not work properly. I had power at all the IC chips but one in particular (U6) was VERY hot. I've had two stages in the process of testing that I feel should be mentioned. First when testing one time, I had hooked up the -12V lead from my bench top power supply, but I accidentally had the +12 and GND leads in each others' terminals :eek: Next, about a week ago, I discovered that I had installed a diode backwards (yes, it was between U6 and U7), and I felt both a a bit of relief and pretty stupid at the same time. After properly orienting the diode and replacing U6 I was able to get an audible signal, and the one chip was no longer hotter than the others. Today, I replaced the rest of the IC chips, plugged it in, and it wasn't any different. Now I'm just at a loss, one thing I'm wondering is if hooking up the supply wrong could damage transistors, bi-polar caps, etc.

    Any input is greatly appreciated!
    Thanks again.
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Last edited: Nov 2, 2012
  3. knel8025

    Thread Starter New Member

    Nov 1, 2012
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  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The diode you mention is between U7-B and U9-B.(and not U6 as you say).
    If the diode is turned around and the reset signal is high, the output of U9-B can not go low anymore.
    This might stress the U9-B and make it hot.

    Bertus
     
  5. knel8025

    Thread Starter New Member

    Nov 1, 2012
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    Thanks again!
     
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