Modifying a lamp/appliance timer?

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Does anyone have any ideas on the possibility of modifying a typical home lamp/appliance timer -- the kind commonly made with 24 hour cycles and often used when you go on vacation to turn lights on at night?

I want to modify one to have about a 5 minute cycle instead of 24 hours. Any suggestions?
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.