An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are general-purpose silicon types, such as the 1N4148 or 1N914. Nore inputs can be added with additional diodes. OR Schmitt gates can be created with the use of a 4093.

 

OR Gate Using NAND
OR Gate Using NAND

 

 

 

Datasheets


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