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Alaskaman66
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Iron
Re: Part IV: Fundamentals of Digital Debugging
Alaskaman66   1/19/2012 3:15:29 PM
NO RATINGS
Re: power problems with logic circuits. I designed a CMOS (not MCU) circuit for a starlight camera control function, and while it worked perfectly on the bench, it didn't work when hooked up the the camera system. It took a memory storage scope to discover that the pan/tilt function, which was 120 VAC switched by electromechanical relays, was generating extreme voltage spikes that showed up in the logic as spurious signals. Fixing the problem required capacitor filters across every 120 V relay contact.

So if it works in the lab, but not the actual environment, start looking beyond the MCU.



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