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simple question - oscilloscope

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Kane2oo2

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hi
just been trying out an old oscilloscope to see if i could figure out how to work it :p

well i connected it to the output of a 555 and saw kind of a square wave but the peak of the wave was like a sawtooth.
What is this caused by?
 
If your squarewave is a few hertz, it sounds like you've got the coupling set to ac. try dc.
At higher frequency, a few khz, a little trimmer in the probe might need adjusting. twiddle for the best squarewave
 
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