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???
02/01/06 18:51
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 		 #108920 - Damaged?
Responding to: ???'s previous message
It remains in the 'ON' state continuously.

Then you have very probably killed the output transistor during experimenting: If you short-circuit the output, the output transistor providing high voltage becomes damaged and looks like a short circuit. Then afterwards, the output shows high voltage all the time.

Check the circuit with a fresh 555. And use Charles' trigger circuit!

Kai

List of 57 messages in thread
TopicAuthorDate
Circuit for dispensing unit            01/01/70 00:00      
   1.1 sec monoshot            01/01/70 00:00      
      this thread is apin off from an earlier            01/01/70 00:00      
         yes            01/01/70 00:00      
         timing circuit            01/01/70 00:00      
   Monostable            01/01/70 00:00      
   Yes.            01/01/70 00:00      
   Hello All            01/01/70 00:00      
      Description of the "Dispensing Unit"            01/01/70 00:00      
         using micro            01/01/70 00:00      
            Microcontroller            01/01/70 00:00      
               Pressure            01/01/70 00:00      
            What must your circuit can do?            01/01/70 00:00      
               0.1 sec            01/01/70 00:00      
                  but not with a potentiometer            01/01/70 00:00      
                     Vernier            01/01/70 00:00      
                        and calibrate it how?            01/01/70 00:00      
               Precision            01/01/70 00:00      
                  Sure!            01/01/70 00:00      
                     Price            01/01/70 00:00      
                        Less than 1€            01/01/70 00:00      
                           levels of precision            01/01/70 00:00      
                              Please have a look into datasheet!            01/01/70 00:00      
                                 somewhere here there is a link            01/01/70 00:00      
                                    Details?            01/01/70 00:00      
                                       I recall that in an earlier thread            01/01/70 00:00      
                              Ooops.            01/01/70 00:00      
                              Blown Discharge PIN            01/01/70 00:00      
                                 You can also let the smoke out of the            01/01/70 00:00      
                                    limits            01/01/70 00:00      
                                       dissapation            01/01/70 00:00      
                                          There must be a point.            01/01/70 00:00      
                                             Fusing the bonding wires            01/01/70 00:00      
                                                History making            01/01/70 00:00      
                                                Current limiting            01/01/70 00:00      
                                 I do go through            01/01/70 00:00      
            schematic and code            01/01/70 00:00      
               codes            01/01/70 00:00      
                  Instruction Description            01/01/70 00:00      
                     not quite            01/01/70 00:00      
                        Pedantic            01/01/70 00:00      
                           is that not the pot calling the kettle b            01/01/70 00:00      
                              Of course not!            01/01/70 00:00      
                  Answers            01/01/70 00:00      
                     Re: codes and shcematic            01/01/70 00:00      
                        Recommendations            01/01/70 00:00      
                           Decimal switches - how to start C            01/01/70 00:00      
      LM555 pin 2 wired wrong.            01/01/70 00:00      
         ... and the LED?            01/01/70 00:00      
            i'm sure thts not the circuit            01/01/70 00:00      
            Astable??            01/01/70 00:00      
               I wondered who'd spot that first...            01/01/70 00:00      
   Damaged?            01/01/70 00:00      
      And Andy's correction            01/01/70 00:00      
         Absolutely!            01/01/70 00:00      
   one shot in the foot            01/01/70 00:00      
      Need not to work unreliably            01/01/70 00:00      

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