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???
04/10/04 20:36
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 		 #68293 - RE: CNY17-3 is the culprit!
Responding to: ???'s previous message
Beside this, I think your optocoupler is responsible for the malfunction. My datasheet says: rise time 300µsec, fall time 300µsec!! So, for a full range swing you need 300µsec plus 300µsec, makes 600µsec, which corresponds to a maximum frequency of 1.7kHz!!!
So, your observation at 3kHz is no surprise with this data.

To the best of my knowledge, CNY17-3 is not that slow. Which datasheet you are consulting?




List of 47 messages in thread
TopicAuthorDate
ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
            RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
            RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
               RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
            RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
               RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
                  RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
            RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
            RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
               RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      RE: Schematic would help us            01/01/70 00:00      
   CNY17-3 is the culprit!            01/01/70 00:00      
      RE: CNY17-3 is the culprit!            01/01/70 00:00      
         RE: CNY17-3 is the culprit!            01/01/70 00:00      
            RE: CNY17-3 is the culprit!            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      May be Prahlad will inform us now?            01/01/70 00:00      
      RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
         RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      
      We are still waiting for more details            01/01/70 00:00      
         3 kHz ? Stepper motor ?            01/01/70 00:00      
      RE: ULN2803.            01/01/70 00:00      
         RE: ULN2803.            01/01/70 00:00      
         RE: ULN2803.            01/01/70 00:00      
            RE: ULN2803.            01/01/70 00:00      
         RE: ULN2803.            01/01/70 00:00      
            RE: ULN2803.            01/01/70 00:00      
   RE: ULN2803 Output droping at 3KHz.            01/01/70 00:00      

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