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 The 555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or  oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor . The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA 
  
Fabrikant: Texas Instruments 
Industriele kwaliteit 
  
klik op de link voor datasheet. 
  
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