Monday 11 April 2016

switches - 4066N analogue switch rapidly switching ON/OFF when should be OFF


I have the following circuit that should light up two LEDs at the exact same time:


(Edit: Removed incorrect 1.64V enable input because, though I now understand it's on the low side, it is not a part of the question that I need an answer to -- it's when the input is 0V that I get the flicker.)


I am using this analogue switch.


When I have 0V on 1E/4E, the 1Z/Y and 4Z/Y switches rapidly close and open -- I took a video with a 1200fps camera and they appear to flicker on and off every 2ms-5ms or so. The LEDs do not flicker identically, but are both flickering rapidly nonetheless.


Is there something wrong with my wiring? Or did I maybe fry this analogue switch somehow?



Answer




As Ignacio mentioned in the comments to the question, this behaviour was caused by using a switching AC-DC converter. Using a linear DC power supply fixed the problem.


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