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555 Timer Projects

Why did I order twenty 555 bipolar timers? Because they were $5.97 with free shipping. Now what do I do with them?

  • Monostable mode: in this mode, the 555 functions as a “one-shot”. Applications include timers, missing pulse detection, bounce free switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) etc
  • Astable – free running mode: the 555 can operate as an oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation, etc.
  • Bistable mode or Schmitt trigger: the 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Uses include bounce free latched switches, etc

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Here is a 555 Switch debouncer:

Here are some ideas! –

50 555 Circuits

http://www.555-timer-circuits.com/

DIY Electric Fence

PWM Motor Driver and LED dimmer

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