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Code lock

Based on a Labs project | October 2011 | Find it here
Code lock
The combination of a couple of thyristors, key switches and a relay as shown in the diagram forms a suitable, reasonably tamper-proof code lock for use in, say, a car. To open the lock,a number of keys must be pressed in a prescribed sequence to energize a relay, whereupon the battery voltage is applied to the ignition switch.
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