deletions | additions       diff --git a/Datasheets for ICs Used.tex b/Datasheets for ICs Used.tex  index 73b5fc5..3e3dc87 100644  --- a/Datasheets for ICs Used.tex  +++ b/Datasheets for ICs Used.tex 
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LM555 timer chip:  http://www.ti.com.cn/cn/lit/ds/symlink/lm555.pdf  74HC194 4-bit bi-directional 4 bit bidirectional  shift register http://www.eng.yale.edu/ee-labs/morse/compo/datasheets/mm74hc194.pdf