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???
03/02/06 17:03
Modified:
  03/02/06 17:54
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 		 #111081 - Enhanced debouncing
Responding to: ???'s previous message
Suresh said:
eg : if i set the delay as .5sec or less (BC550 will do its job only for this time) and pressing the switch continuously for 1 sec. will it not cause any abnormality or a repeat in cycle?

If very short monoflop pulses are to be selected, then it's better to have two independent time constants, for the debouncing of switch and the performing of trigger puls. Try this circuit:



This circuit produces highly stable pulses in the range of 5msec...10sec.
Use a multiturn version for the 2M2 pot, though, and/or put a 100k pot in series to the 2M2 pot, for the fine tuning.

Information about debouncing can be found here:

http://www.8052.com/forum/read.phtml?id=57836

and here:

http://www.8052.com/forum/read.phtml?id=57919

Kai

List of 39 messages in thread
TopicAuthorDate
Pressing 555 trigger SW continuously.            01/01/70 00:00      
   Again            01/01/70 00:00      
   capacitor couple it.            01/01/70 00:00      
      Re: cap coupling            01/01/70 00:00      
         Look up the internal block diagram            01/01/70 00:00      
            Read the Data Sheet!!            01/01/70 00:00      
      got the o/p            01/01/70 00:00      
         Satisfaction            01/01/70 00:00      
            Thanku steve            01/01/70 00:00      
         Not enough            01/01/70 00:00      
            alternatives ?            01/01/70 00:00      
               Remedy            01/01/70 00:00      
                  remedy?            01/01/70 00:00      
                     Alternatives            01/01/70 00:00      
                  BC550 & diodes            01/01/70 00:00      
                     Try it by yourself, it's simple!            01/01/70 00:00      
                        analysis results            01/01/70 00:00      
                           Analysis            01/01/70 00:00      
                              Thank you            01/01/70 00:00      
                              after the set delay Time            01/01/70 00:00      
                                 Enhanced debouncing            01/01/70 00:00      
                                    What do you think about it, Suresh?            01/01/70 00:00      
   why the neqw thread            01/01/70 00:00      
      reply            01/01/70 00:00      
         Read the Data Sheet!!            01/01/70 00:00      
   kalpak dabir            01/01/70 00:00      
   Have you considered using a 74121?            01/01/70 00:00      
      74121 versus CMOS555            01/01/70 00:00      
      74121 fine for short period delays?            01/01/70 00:00      
         No debounce needed???            01/01/70 00:00      
            Schmitt trigger operation?            01/01/70 00:00      
               Transition times of input signal            01/01/70 00:00      
                  controlling noise related issues            01/01/70 00:00      
                     Schmitt-trigger operation            01/01/70 00:00      
                      CD 4541BC = Alternative for ICM 7555?            01/01/70 00:00      
                        Do you really need to build it?            01/01/70 00:00      
                           Yes.            01/01/70 00:00      
                              try try try again            01/01/70 00:00      
                                 a sign of confidence            01/01/70 00:00      

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