Ejaz ur Rehman, principal scientific officer at ACL Pinstech, received a master's degree in physical chemistry from Quaid-i-Azam University, Islamabad, Pakistan. Email address: ejaz_urrehman@yahoo.co.uk
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May 26, 2003[Ideas For Design] Simple Electronic Lock Uses Single-Transistor Circuit
A very simple but highly efficient combination lock circuit is shown in the figure. Any type of on/off switches can be used, varying from commercially available inexpensive types to more sophisticated miniswitches. The switches are assembled according...
