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Universal infrared on-off for almost anything?

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Is there an esy way to build a tiny remote that will turn on/off almost anything via infrared (capable) such as TVs, projectors, sterios, etc.?
Is there a simple 555 driven frequency for an infrared LED?  I know different brands have different codes but I saw this little keychain remote that said it would do on/off, volume, and channel for any TV.  I want to attempt to build it but due to my not so good knowledge of electronics I just want to tackle the on/off if possible.

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