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The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its low price and ubiquity. The 556 timer is simply two 555 timers in a single package.

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Can I use the oscillation frequency equation for this circuit?

I've just started doing electronics on a breadboard and I'm making a "Mini Strobe Light" from Jaycar's 'Short Circuit 2': The book says that the first IC 555 (IC1) is a basic oscillator and that the … second IC 555 (IC2) is a monostable multivibrator. …
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