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???
05/25/06 12:11
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 		 #117082 - Theorizing? this should be fairly easy t
Responding to: ???'s previous message
The junction of LED and S1 is connected as input to a 74LS123 Monostable to generate a pulse.
My favorite nicknane for a monostable is "one shot in the foot"
one shots are notoriously noise sensitive.

Theorising that this could be due to induced current on S1 wires when Lamp is turned ON,

Theorizing? this should be fairly easy to observe.

Is the lamp turned on and off during operation, your "schematic" does not show any such.

If you find that it is the lamp, insert a NTC resistor in series with it (you may have to change to e.g. an 18V lamp).

Erik



List of 36 messages in thread
TopicAuthorDate
Cable Capacitance Problem ?            01/01/70 00:00      
   Theorizing? this should be fairly easy t            01/01/70 00:00      
      Yes. Lamp is turned OFF and ON            01/01/70 00:00      
         I take that this is simultaneous to my a            01/01/70 00:00      
      The one-shot is probably a factor            01/01/70 00:00      
         Schematic upload - how to do it?            01/01/70 00:00      
            Here is the link            01/01/70 00:00      
   Lamp is working like PTC            01/01/70 00:00      
      in the olden days, they were called URDO            01/01/70 00:00      
         Thanks for the explanation.            01/01/70 00:00      
            because            01/01/70 00:00      
   I miss the urgently needed bandwidth lim            01/01/70 00:00      
       I agree, the idea was too simplistic            01/01/70 00:00      
         peanuts...            01/01/70 00:00      
            I'd say            01/01/70 00:00      
      Working Solution            01/01/70 00:00      
         I don't think it's solved...            01/01/70 00:00      
            Details            01/01/70 00:00      
               Hello?            01/01/70 00:00      
                  try this, try that, go broke            01/01/70 00:00      
               In many companies, it will get you fired            01/01/70 00:00      
                  expanding            01/01/70 00:00      
                  Just debating            01/01/70 00:00      
                     They're a crutch ...            01/01/70 00:00      
                     so called professionals that believe tha            01/01/70 00:00      
                     Monoflops            01/01/70 00:00      
                        burnt child shy fire            01/01/70 00:00      
                        If you are careful, they might work.            01/01/70 00:00      
                           not very good odds            01/01/70 00:00      
                           Being careful...            01/01/70 00:00      
         not noise supression            01/01/70 00:00      
   does the ULN(can't read the numbers) dri            01/01/70 00:00      
      ULN2003            01/01/70 00:00      
         I did NOT ask for the part number, I ask            01/01/70 00:00      
            By other words...            01/01/70 00:00      
               Books don't say all this.            01/01/70 00:00      

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