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Erik Malund
02/24/06 07:42
Read: 438 times
Mt Airy, Nc
USA


 
#110678 - ALWAYS design to worst case.
Responding to: Sun Din's previous message
My 15V input to the network is supplied via an open collector output of an inductive switch. When the switch is on, the transistor switches on supplying 15V to the network.
why not just connect the resistor from the open collector output to 5V?

I have now settled on using just a voltage devider to drop the voltage, and protection is provided by a 6.2V zener in the place of the 4.7V zener. this should clamp any inputs higher than 6.2V to 6.2V plus the tolerance
with a 10% zener the clamp can be as hign as 6.8V. ALWAYS design to worst case.

Erik.



List of 21 messages in thread
TopicAuthorDate
Zener Turn-on-time      Sun Din      02/20/06 01:16      
   Remedy        Kai Klaas      02/20/06 07:08      
      Thank You Kai      Sun Din      02/22/06 06:18      
         Divider      Kai Klaas      02/22/06 06:34      
            Resistor values      Sun Din      02/23/06 03:27      
               Read again my calculation example      Kai Klaas      02/23/06 05:58      
               drop that stupid resistor to ground      Erik Malund      02/23/06 07:04      
         can you draw the schematic?      Abhishek Singh      02/22/06 07:21      
            Assistance required to post Sch      Sun Din      02/23/06 03:38      
               If using "Windows"        Jon Ledbetter      02/23/06 07:57      
                  Typo Oops      Jon Ledbetter      02/24/06 08:19      
         Using a cap is enough      Kai Klaas      02/22/06 09:13      
            actually for the "typical" use it is not      Erik Malund      02/22/06 09:53      
               Less than 1nsec      Kai Klaas      02/22/06 10:12      
            Resistor instead of the cap      Sun Din      02/23/06 03:32      
   Sch      Sun Din      02/24/06 04:48      
      ALWAYS design to worst case.      Erik Malund      02/24/06 07:42      
      Homepage      Jon Ledbetter      02/24/06 08:13      
         why is that 1k still there      Erik Malund      02/24/06 08:52      
      Aha!      Kai Klaas      02/25/06 06:47      
         Thank you all for your help.      Sun Din      02/27/06 08:42      

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