Electronics > Beginners

Oscilloscope interference.

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ferdieCX:
I had the same problem 5 years ago, the power brick of the LED bar interfered with the trigger of my scope.
My LED bar (Diodor brand) is specified to work between 10 to 14 V so, I made a simple power supply with a 9 V + 9 V transformer, two diodes
and a filter capacitor calculated to have less than 1 Vpp ripple. This way, the bar gets a voltage that roughly varies between  11 and 12 V.

nigelwright7557:
I had the same problem with my angle poise lamp.
It radiates into my audio circuits nicely !
I found temporarily lifting the light up a bit until  I finished with the scope worked for me.

I got caught out similarly many years ago with 50Hz interference on my scope.
I had sat my sig gen on top of the scope and the transformer was radiating down into the scope !

JustMeHere:

--- Quote from: GadgetBoy on July 06, 2019, 02:47:53 am ---
--- Quote from: JustMeHere on July 06, 2019, 02:36:29 am ---Did you watch Dave's video on this?

--- End quote ---
Which one? I've seen a few of his recent ones, but not one that addresses this particular issue. Link?

Sent from my ONEPLUS A3000 using Tapatalk

--- End quote ---



Watch the whole 6 mins.

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