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Recent content by TechnoGilles

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    Troubleshooting Arduino + Heart Pulse Sensor Circuit

    I am not sure what you mean by "which side the components are on (like the front or back)"... But it is vital to respect the pinout of each device. Each pin has a unique function and when schematics are made, those pin functions determine how to interconnect components together. So when you...
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    Taming an unstable power rail

    ALL'S WELL THAT ENDS WELL !! Although the bug was a stupid mistake I made from the beginning. All along I though I was getting power to my system from my 6V-3A DC source... WRONG !! ... I mistakenly used my 6V-1.2A DC source which is well below the 2A that my system needs at peak usage... How...
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    Troubleshooting Arduino + Heart Pulse Sensor Circuit

    Hi ! Here are a few hints (from an experienced hobbyist point of view) : 1) and 4) The terms "trace" and "plane" refers to PCB (printed circuit board) design. Your diagram seemed to imply that you were designing a PCB so people commented on that assumption. Traces are the "lines" of copper...
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    Taming an unstable power rail

    I feel like one of the module/IC is drawing excess current. Does anybody has any idea as to how I can measure current consumption of a circuit that is soldered in place ?
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    Taming an unstable power rail

    @duke37, I checked and replaced the caps on the VD5 rail. It did not help but thanks a lot for the advice. @BobK, the transceivers IC already have100nF caps. The USB and LCD modules are autonomus modules plugged through a socket for the USB and a ribbon connector for the LCD. They both have...
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    Taming an unstable power rail

    Hi ! Many thanks for the answer ! The regulator is a MIC5209-5V. I have a 10uF input cap, both 10uF and 0.1uF output caps, and a 470pF bypass cap. From the datasheet, I feel I am exceeding the recommended minimums. Interestingly enough, the VD5 rail is the only one that does NOT have a power...
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    Taming an unstable power rail

    Hi all, I experience a strange behaviour with my project and I need some help to continue my investigation. The project (see picture) : - Was conceived and built entirely by me - Has the following power rails : VD3, VC3, VSD, are 3.3V; VD5 is 5V. They are all regulated by Micrel LDO...
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