555

bertus

Joined Apr 5, 2008
20,863
Hello,

The powersupply of the 555 MUST be DC.
What input do you mean?
The trigger input may NOT go negative and above the DC voltage of the powersupply.

Bertus
 

SgtWookie

Joined Jul 17, 2007
22,220
Well, no - it can't use AC directly as an input, as AC implies that the signal goes above and below the 0v reference; the negative voltage would burn up the 555 timer.

It might use rippled DC input, as long as the rippled DC did not exceed the limits of the timers' power supply rails.

Rippled DC can resemble AC (as a sine wave), but isn't centered around the 0v reference.
 

#12

Joined Nov 30, 2010
18,210
Good point, wookie. I missed that. Or did I assume ht knew that? It's so hard to guess the intellectual level of a person when you've only seen him make one sentence.
 
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