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LM555 Timer Circuits This page presents general information and tips for using the LM555 timer and devices with other letter prefixes. There will be minor internal circuitry differences between 555 timer IC's from the various manufacturers but they all should be useable for the circuits on this page. If you would like to use any of these ideas, take the time to do some testing before using the LM555 timer in an actual circuit. LM555 Timer Circuits
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