In the attached picture (please see below), you can see the schematics of an Arduino circuit i have assembled.
It is a circuit that enables a smartphone, to switch On and Off electric devices. It works by converting an audio signal into IR pulses.
Here is a link i used, only as general guideline, to assemble this circuit:
My problem is this:
Most of the time the circuit works well. But sometimes it gets stuck and does not respond.
When that happens, i disconnect the upper left BLUE wire at “Disconnection point A” (please look at image) and then immediately reconnect it and things go back to normal - it works well again.
Is there some kind of capacitor or diode or other electronic component that i can add to this circuit, which would eliminate that problem?
And here is a smaller version of that image and below also a download link: