Guest bosskardo Posted April 14, 2014 Report Share Posted April 14, 2014 Hi, I saw this sch on NE555P datasheet (http://www.ti.com/lit/ds/symlink/sa555.pdf):But I've only seen it done like this:I don't get why the first one is like that. Why is there a capacitor from the power source to gnd? And whats the point of R_L from output to power(I don't know much about 555 internals but could it be that its just opposite to NE555N and I've used NE555N and thats why they are different?)? Link to comment Share on other sites More sharing options...
audioguru Posted April 14, 2014 Report Share Posted April 14, 2014 I answered this question in the forum on the other website.Look at the datasheet for the LM555 that tells you all about it. Link to comment Share on other sites More sharing options...
Hero999 Posted April 14, 2014 Report Share Posted April 14, 2014 RL symbolises a load, whether it be a lamp, relay, buzzer etc.The second circuit is wrong - they forgot the decoupling capacitor; something which is explained on the datasheet. Link to comment Share on other sites More sharing options...
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