Meet the 4093 (2nd edition) - Electrical e-Library.com
CD4093 Datasheet(PDF) - Fairchild Semiconductor
CD4093 - Quad 2-Input NAND Schmitt Trigger IC
CD4093 Datasheet Fairchild Semiconductor pdf data sheet FREE from www.radioradar.net
nand - More Fun with the CD4093 IC as Schmitt Trigger Oscillator. Any practical difference between circuit version with "Enable" pin and Without? - Electrical Engineering Stack Exchange
Quad Oscillator using 4093 [tutorial] | andreas siagian
Meet the 4093 (2nd edition) - Electrical e-Library.com