mitaux8030
Silent Key
I have a PRO2022 scanner that I have modded with a line level output, using a LM358. The output of this uses a 10uF coupling capacitor to a 1/4 inch jack on the back panel. From there, I use a 3k>3k isolation transformer, and that feeds the line level input on a PC soundcard to record.
My problem is the 10uF capacitor keeps 'blowing up' - not literally, but it definitely develops a problem in passing audio. I've replaced it three times so far, first was a regular electrolytic, then a tantalum, then a SMD tantalum. When I replace the cap, everything comes good for a few months, then the problem comes back again.
Anyone have any ideas on what to do to stop this problem? I thought the 3k isolation transformer would have kept everything isolated enough to not cause any problems... or might it be passing enough 60Hz AC differential in ground potentials to cause the cap to die? (PC using a switch mode power supply, PRO2022 uses an external switch mode supply)
My problem is the 10uF capacitor keeps 'blowing up' - not literally, but it definitely develops a problem in passing audio. I've replaced it three times so far, first was a regular electrolytic, then a tantalum, then a SMD tantalum. When I replace the cap, everything comes good for a few months, then the problem comes back again.
Anyone have any ideas on what to do to stop this problem? I thought the 3k isolation transformer would have kept everything isolated enough to not cause any problems... or might it be passing enough 60Hz AC differential in ground potentials to cause the cap to die? (PC using a switch mode power supply, PRO2022 uses an external switch mode supply)